CN114753401B - Construction method for tunnel bottom karst cave treatment - Google Patents
Construction method for tunnel bottom karst cave treatment Download PDFInfo
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- CN114753401B CN114753401B CN202210368840.8A CN202210368840A CN114753401B CN 114753401 B CN114753401 B CN 114753401B CN 202210368840 A CN202210368840 A CN 202210368840A CN 114753401 B CN114753401 B CN 114753401B
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- 238000010276 construction Methods 0.000 title claims abstract description 79
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012876 topography Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000019994 cava Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The disclosure relates to the technical field of tunnel construction, in particular to a construction method for tunnel bottom karst cave treatment. The construction method comprises constructing pile foundation construction space in a tunnel and performing primary support treatment; filling materials into karst cave at the bottom of each pile foundation construction space and constructing pile foundations; constructing a first raft at the end of the pile foundation; constructing raft connection spaces between every two connected pile foundation construction spaces; arranging a second raft at the bottom of the raft connecting space to connect two adjacent first rafts; and constructing a tunnel main body. In the construction method provided by the disclosure, pile foundations are arranged to penetrate through karst development areas, first raft plates are arranged on the pile foundations, and adjacent first raft plates are connected through second raft plates, so that the first raft plates, the second raft plates and the pile foundations are connected into a whole, a hidden karst section is spanned, geological conditions in a tunnel are improved, the structural strength of a tunnel bottom structure is improved, the safety of the stress state of the tunnel bottom is improved, and the construction difficulty is reduced.
Description
Technical Field
The disclosure relates to the technical field of tunnel construction, in particular to a construction method for tunnel bottom karst cave treatment.
Background
The method has the advantages that the regions in China are wide, the topography and the topography are changeable, the influence on railway construction is great, part of tunnel areas belong to the low-mountain topography in corrosion, the karst of the tunnel areas is strongly developed, more small karst cavities are developed among karst cave groups, the morphological development of the karst cavities is large and irregular, and most of the karst cavities are free of filling materials and underground water. The engineering geological condition is complex, and the construction difficulty is high.
Disclosure of Invention
In order to solve the technical problems, the disclosure provides a construction method for tunnel bottom karst cave treatment.
The construction method for the karst cave treatment at the bottom of the tunnel comprises the following steps:
s1: constructing pile foundation construction spaces at a plurality of preset positions in the tunnel;
s2: performing primary support treatment on each pile foundation construction space;
s3: filling materials into karst cave at the bottom of each pile foundation construction space;
s4: constructing pile foundations in each karst cave filled with materials;
s5: constructing a first raft at the end of the pile foundation;
s6: constructing raft connection spaces between every two connected pile foundation construction spaces, wherein two adjacent pile foundation construction spaces are communicated through the raft connection spaces;
s7: arranging second raft plates at the bottom of the raft plate connecting space, wherein the second raft plates are connected with two adjacent first raft plates;
s8: and constructing a tunnel main body structure.
Optionally, the karst cave at the bottom of each pile foundation construction space is filled with materials, wherein the materials are gravels.
Optionally, after S4 and before S5, the method further includes:
removing materials filled in the karst cave;
and backfilling by using concrete.
Optionally, constructing pile foundations into each karst cave filled with materials, including:
pile foundations penetrate through karst development areas.
Optionally, performing primary support treatment on each pile foundation construction space, including:
the pile foundation construction space adopts steel frames for supporting, the distance between every two steel frames is 0.6m, and the thickness of the pile foundation construction space is 25cm.
Optionally, the pile foundation construction space is 3.1m in height and 4.8m in width, and the pile foundation construction space is 0.1m longer than the first raft edge.
In the construction method for tunnel bottom karst cave treatment, pile foundations are arranged to penetrate through karst development areas, first raft plates are arranged on the pile foundations, adjacent first raft plates are connected through second raft plates, so that the first raft plates, the second raft plates and the pile foundations are connected into a whole, a hidden karst section is spanned, pile foundations, the first raft plates, the second raft plates and the pile foundations are arranged through construction, the first raft plates, the second raft plates and the pile foundations are connected into a whole, the tunnel bottom forms an integral structure, geological conditions in the tunnel are improved, the structural strength of the tunnel bottom structure is improved, the safety of the stress state of the tunnel bottom is improved, and the construction difficulty is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a construction method of tunnel bottom karst cave treatment in accordance with an embodiment of the present disclosure;
fig. 2 is a schematic side view of the raft connection space according to the embodiment of the disclosure along the extending direction of the tunnel;
fig. 3 is a schematic side view of the raft construction space according to the embodiment of the disclosure along the extending direction of the tunnel;
fig. 4 is a schematic front view of the tunnel body according to the embodiment of the present disclosure along the extending direction of the tunnel when the construction is completed.
1, pile foundation construction space; 2. karst cave; 3. pile foundation; 4. raft connection space; 5. a first raft; 6. a second raft; 7. a tunnel body.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Referring to fig. 1 to 4, an embodiment of the present invention provides a construction method for karst cave treatment at a bottom of a tunnel, which includes:
s1: pile foundation construction space 1 is constructed at a plurality of preset positions in the tunnel.
Specifically, the primary support of the excavated tunnel needs to be reinforced before the tunnel is excavated: 2 phi 42 foot locking anchor pipes are added to each steel frame of the middle step, each anchor pipe is 4m long, grouting is carried out for reinforcement, phi 42 small guide pipes are arranged at the top, the length is 4m, and grouting is carried out for reinforcement of surrounding karst cave filling materials or cave residues. And excavating construction pile foundation construction space 1 for each truss after the construction of the small guide pipe is completed. And after the primary support of the tunnel is broken, the locking mouth steel frame is erected and welded with the primary support steel frame of the original tunnel, the bottom is provided with a concrete base, and the size of the base is 0.5m long, 0.5m wide and 1m deep. When the pile foundation construction space 1 is excavated, firstly, the tunnel bottom is measured and paid off to determine the position of the pile foundation construction space 1, then the pile foundation construction space 1 is excavated one by one, temporary cross braces are follow up one by one, the position of a preset pile foundation 3 is not built, the two temporary cross braces are closed into a ring by spraying anchors, the bottom of the pile foundation construction space 1 is formed, and the pile foundation construction space 1 is formed with an upper steel structure.
S2: carrying out primary support treatment on each pile foundation construction space 1: the outer pile foundation of the primary support is constructed by adopting the manual hole digging pile, the air pick is adopted to excavate as much as possible, if the blasting is needed, the loosening blasting is adopted, the vibration or disturbance is reduced, and the observation and the sedimentation observation are carried out on the pile foundation construction space 1 in the construction process.
S3: and filling materials into the karst cave 2 at the bottom of each pile foundation construction space 1.
S4: and constructing pile foundations 3 into each karst cave 2 filled with materials, wherein water pumping is reinforced when the pile foundations 3 are concreted, water is not required to be accumulated in holes, and the concrete is not required to be soaked by water before final solidification.
S5: constructing a first raft 5 at the end part of the pile foundation 3, wherein the construction of the first raft 5 is required to be carried out after the concrete of the pile foundation 3 meets the age, and in order to prevent the initial support settlement caused by the construction, the construction is carried out by adopting segmented block construction, namely, one section with the longitudinal length of 2 m-5 m is transversely divided into two sections, and 24 blocks of construction is completed;
s6: and constructing a raft connection space 4 between every two connected pile foundation construction spaces 1, wherein two adjacent pile foundation construction spaces 1 are communicated through the raft connection space 4, namely, the raft connection space 4 is a channel dug through the bottom of 2 sections of tunnels of two adjacent karst caves.
S7: the bottom in raft connection space 4 sets up second raft 6, and adjacent two first rafts 5 are connected to second raft 6, and first raft 5 is connected with second raft 6 and is formed the raft assembly, and the horizontal width of raft assembly stretches out in karst cave section. In order to ensure the integral structure of the raft assembly, the raft total components are divided into small blocks in construction for the first raft 5 and the second raft 6, and connecting steel bars are reserved to be connected into a whole; constructing at left and right sides, transversely partitioning, arranging construction joints between two pile foundations 3, and arranging transverse connecting ribs; the raft board is crossed over two pile foundations 3 according to the longitudinal length of 2m and the transverse length to reserve raft board connecting steel bars; constructing a 1.5m wide support wall at the top of the raft; after the raft construction is completed, the primary support of the tunnel body is lengthened to the top of the raft, and a 1.5m wide support wall of the top of the raft is poured by using a C20 concrete vertical mould so as to support the upper part of the working chamber of the pile foundation 3.
S8: the tunnel main body 7 is constructed, the tunnel arch wall primary support and lining structure falls on the raft assembly, the pile foundation 3 passes through the karst development area, the raft assembly connects the pile foundation 3 into a whole, the hidden karst section is spanned, the geological conditions in the tunnel are improved, the structural strength of the tunnel bottom structure is improved, the safety of the stress state of the tunnel bottom is improved, and the construction difficulty is reduced.
In some embodiments, the karst cave 2 at the bottom of each pile foundation construction space 1 is filled with materials, and the materials are gravels. For the karst cave with the height ranging from 2m to 5m and without filler, when the karst cave is punched to the roof strata of the karst cave, the slurry suddenly descends, and the replenishing slurry can not rise, and then the crushed stone, the sand mixture and the bagged cement are filled first, so that the karst cave cavity forms a natural cone.
In some embodiments, after S4 and before S5, further comprising:
removing the materials filled in the karst cave 2;
the concrete backfill is utilized, a measure of centralized backfill is needed, wherein the centralized backfill refers to centralized filling of clay, rubble and bagged cement or concrete, and the precondition of the method is that the filling time is short and centralized, so that the bearing capacity of the karst cave 2 area is effectively enhanced.
In some embodiments, constructing pile foundations 3 into each karst cave 2 filled with material includes:
pile foundation 3 runs through karst development district, and pile foundation 3 passes karst cave 2 along vertically promptly, and one end is connected in karst cave 2 bottom preset position, and the other end sets up first raft.
In some embodiments, the primary support treatment is performed on each pile foundation construction space 1, including:
the pile foundation construction space 1 adopts steel frames for supporting, the distance between every two steel frames is 0.6m, and the thickness of the pile foundation construction space is 25cm.
In some embodiments, the pile foundation construction space 1 has a height of 3.1m and a width of 4.8m, and the pile foundation construction space 1 has a length of 0.1m longer than the edge of the first raft 5.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The above is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The construction method for tunnel bottom karst cave treatment is characterized by comprising the following steps:
s1: constructing pile foundation construction spaces (1) at a plurality of preset positions in the tunnel;
s2: performing primary support treatment on each pile foundation construction space (1);
s3: filling materials into karst cave (2) at the bottom of each pile foundation construction space (1);
s4: constructing pile foundations (3) into each karst cave (2) filled with materials;
s5: constructing a first raft (5) at the end part of the pile foundation (3);
s6: constructing a raft connection space (4) between every two connected pile foundation construction spaces (1), wherein two adjacent pile foundation construction spaces (1) are communicated through the raft connection spaces (4);
s7: a second raft (6) is arranged at the bottom of the raft connecting space (4), and the second raft (6) is connected with two adjacent first rafts (5);
s8: and constructing a tunnel main body (7).
2. The construction method for tunnel bottom karst cave treatment according to claim 1, wherein the karst cave (2) at the bottom of each pile foundation construction space (1) is filled with material, and the material is crushed stone.
3. The method for constructing a karst cave at the bottom of a tunnel according to claim 1, further comprising, after S4 and before S5:
removing the materials filled in the karst cave (2);
and backfilling by using concrete.
4. A method of constructing a tunnel bottom karst cave treatment according to claim 1, characterized in that said constructing pile foundations (3) into each karst cave (2) filled with material comprises:
the pile foundation (3) penetrates through the karst development area.
5. The construction method for tunnel bottom karst cave treatment according to claim 1, characterized in that said performing primary support treatment for each pile foundation construction space (1) comprises:
pile foundation construction space (1) adopts the steelframe to strut, every interval between the steelframe is 0.6m, hangs the net and spouts anchor protection, and thickness is 25cm.
6. The construction method for tunnel bottom karst cave treatment according to claim 1, characterized in that the pile foundation construction space (1) is 3.1m high and 4.8m wide, and the length of the pile foundation construction space (1) is 0.1m longer than the edge of the first raft (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368840.8A CN114753401B (en) | 2022-04-08 | 2022-04-08 | Construction method for tunnel bottom karst cave treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210368840.8A CN114753401B (en) | 2022-04-08 | 2022-04-08 | Construction method for tunnel bottom karst cave treatment |
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| CN114753401A CN114753401A (en) | 2022-07-15 |
| CN114753401B true CN114753401B (en) | 2023-05-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10280861A (en) * | 1997-04-01 | 1998-10-20 | Shimizu Corp | Construction method of tunnel junction |
| WO2016095629A1 (en) * | 2014-12-15 | 2016-06-23 | 中铁第四勘察设计院集团有限公司 | Advanced support structure for oversized variable-cross-section tunnel |
| WO2017185905A1 (en) * | 2016-04-29 | 2017-11-02 | 中铁第四勘察设计院集团有限公司 | Ribbed column distributed turnout foundation structure for low-set mid-to-low speed magnetic levitation line |
| CN111335321A (en) * | 2020-03-12 | 2020-06-26 | 广东省建筑构件工程有限公司 | Deep foundation pit structure above subway tunnel and construction method thereof |
| CN113931212A (en) * | 2021-11-25 | 2022-01-14 | 中铁四院集团西南勘察设计有限公司 | Road and bridge transition section structure for tramcar and construction method thereof |
| CN114215090A (en) * | 2022-01-13 | 2022-03-22 | 中建八局第二建设有限公司 | Construction method of raft and compression pile in closed space |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594229B (en) * | 2020-05-28 | 2021-08-20 | 中建七局交通建设有限公司 | Construction method for multi-arch tunnel entrance under shallow-buried water-rich geological condition |
-
2022
- 2022-04-08 CN CN202210368840.8A patent/CN114753401B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10280861A (en) * | 1997-04-01 | 1998-10-20 | Shimizu Corp | Construction method of tunnel junction |
| WO2016095629A1 (en) * | 2014-12-15 | 2016-06-23 | 中铁第四勘察设计院集团有限公司 | Advanced support structure for oversized variable-cross-section tunnel |
| WO2017185905A1 (en) * | 2016-04-29 | 2017-11-02 | 中铁第四勘察设计院集团有限公司 | Ribbed column distributed turnout foundation structure for low-set mid-to-low speed magnetic levitation line |
| CN111335321A (en) * | 2020-03-12 | 2020-06-26 | 广东省建筑构件工程有限公司 | Deep foundation pit structure above subway tunnel and construction method thereof |
| CN113931212A (en) * | 2021-11-25 | 2022-01-14 | 中铁四院集团西南勘察设计有限公司 | Road and bridge transition section structure for tramcar and construction method thereof |
| CN114215090A (en) * | 2022-01-13 | 2022-03-22 | 中建八局第二建设有限公司 | Construction method of raft and compression pile in closed space |
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| CN114753401A (en) | 2022-07-15 |
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