CN113981938A - Method for preventing road surface from sinking in construction of karst mountain urban underground engineering - Google Patents
Method for preventing road surface from sinking in construction of karst mountain urban underground engineering Download PDFInfo
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- CN113981938A CN113981938A CN202111349575.0A CN202111349575A CN113981938A CN 113981938 A CN113981938 A CN 113981938A CN 202111349575 A CN202111349575 A CN 202111349575A CN 113981938 A CN113981938 A CN 113981938A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
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- E03F3/06—Methods of, or installations for, laying sewer pipes
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Abstract
The invention discloses a method for preventing road surface collapse in karst mountain city underground engineering construction, which comprises three stages of construction before, construction during and construction after, wherein the main technical purpose of the construction before stage is to find out the development conditions of unfavorable geological risks such as karst, soil cave, road surface void, porosity, rich water and the like before construction, so as to find out early and dispose; the main technical purpose of the construction middle stage is to dynamically follow up the construction progress so as to ensure the safety of the road surface in construction; the main technical purpose of the post-construction stage is to find out the risks still existing in the construction influence range and the damage and leakage conditions of tap water, rainwater and sewage pipelines during the period from the completion of construction to the start of trial operation of a project, and provide a reasonable treatment suggestion; the construction unit verifies the disposal effect in time after disposing and takes the disposal effect as the basic data for acceptance check of the completion of the construction of the civil engineering unit; the invention can improve the capacity of preventing the road surface from collapsing, thereby reducing the construction risk and ensuring the ground safety during the construction.
Description
Technical Field
The invention relates to a method for preventing road surface collapse in karst mountain urban underground engineering construction, and belongs to the technical field of tools.
Background
Karst mountain cities refer to mountain cities where poorly karst geology is a prevalent property. The top plate of karst mountain city underground engineering is often located near the geotechnical interface, and soluble rock develops strongly near the geotechnical interface in many karsts, and the common existence of a ditch, a trough, a large-scale corrosion crack, a vertical corrosion cavity and the like causes a large amount of road surface collapse accidents in construction.
Based on the method, the development condition of the karst, particularly the development condition of the karst near the bedrock surface, is the key point of investigation and construction of underground engineering of karst mountain areas.
The contents related to karst investigation in the current geotechnical investigation specifications are mainly engineering drilling, but the drilling is a hole, and the density of drilled holes is sparse, so that the requirements on construction safety cannot be met. And blind construction of a construction unit is adopted, so that the probability of road surface collapse accidents is increased.
Namely: a method for preventing road surface collapse in karst mountain city underground engineering construction can improve karst detection capability and roadbed disease detection capability, further reduce construction risks and guarantee ground safety, people life safety and property safety during construction.
Disclosure of Invention
In view of the above, the invention aims to provide a method for preventing road surface collapse in karst mountain urban underground engineering construction, which can improve the karst detection capability and the roadbed disease detection capability, further reduce the construction risk and ensure the ground safety during construction; the defects of the prior art can be overcome.
The purpose of the invention is realized by the following technical scheme: a method for preventing road surface collapse in karst mountain city underground engineering construction comprises three stages of construction, construction and construction, wherein the three stages comprise the following steps: the construction early stage: step 1, collecting data of a construction environment, and carrying out on-site investigation and recheck; step 2, according to the design scheme and the construction organization scheme of the underground engineering, selecting an engineering geophysical prospecting method, arranging geophysical prospecting lines, selecting data acquisition parameters, carrying out ground comprehensive geophysical prospecting general survey, carrying out drilling verification according to the general survey result, and finding out the underground karst development condition and the soil cave development condition before construction so as to supplement earlier-stage survey data; step 3, exploring the risks of damage and leakage of the water supply and drainage pipeline, the risk of the buried depth being less than 3 meters and the risk of the buried depth being more than 3 meters, and carrying out engineering treatment on the existing risks; step 4, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, and if the risk points are abnormal, verifying and analyzing again;
step 1, carrying out one-time comprehensive detection on the whole construction site regularly, wherein the detection contents comprise: the risk of damage and leakage of the water supply and drainage pipeline and the risk of the burial depth being less than 3 meters and the risk of the burial depth being more than 3 meters; step 2, timely mastering advanced geological forecast results and tunnel face excavation exposure conditions, timely carrying out comprehensive geological analysis when advanced geological forecast data is inconsistent with an early detection result, and carrying out retesting if necessary; when karst is revealed and construction abnormalities such as tunnel face collapse, mud outburst, water burst and the like occur, shallow layer detection aiming at the risk that the buried depth is less than 3 meters is carried out in real time, if pavement void and soil cave risks are not found, then deep layer detection aiming at the risk that the buried depth is more than 3 meters is carried out, the development condition of deep diseases is determined, and engineering treatment is carried out on risk points; step 3, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, and if the risk points are abnormal, verifying and analyzing again;
step 1, regularly detecting the risks of damage and leakage of the water supply and drainage pipeline, the burial depth of less than 3 meters and the risk of the burial depth of more than 3 meters; and 2, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, if the risk points are abnormal, verifying and analyzing again, and evaluating the ground stability and the influence on the surrounding environment.
In the step 3 of the pre-construction stage, aiming at the risk that the buried depth is less than 3 meters, a three-dimensional radar or multi-channel radar technology is adopted to find out the conditions of road surface void, looseness and water enrichment before construction, and drilling verification is carried out; finding out the condition of roadbed soil caverns and karsts before construction by adopting a large-depth-finding ground penetrating radar, a micro-motion exploration method or a direct current method and performing drilling verification; the leakage detector, the pipeline periscope and the pipeline television detection technology are adopted to find out the damage and leakage conditions of tap water, rainwater and sewage pipelines and find out the occurrence reasons of roadbed diseases before construction.
In the construction middle stage, one quarter is taken as a period, and one comprehensive detection is carried out on the whole field; and in the post-construction stage, one half year is a period, and one-time comprehensive detection is carried out on the whole field.
In the middle stage of construction, 30-60 meters are taken as a cycle, dynamic follow-up detection is carried out according to the tunnel face tunneling condition, and the key point is to carry out a multi-channel radar technology or a three-dimensional radar technology so as to detect the shallow risk with the buried depth of less than 3 meters.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention improves the karst detection capability and the roadbed disease detection capability, thereby reducing the construction risk and ensuring the ground safety, the life safety of people, the property safety and the like during construction;
2) in the construction of urban underground engineering in karst mountainous regions, the defect of the existing investigation specification for poor karst geology is made up;
3) the engineering change caused by unclear karst investigation is reduced, and the total construction investment cost is saved.
4) The prior art does not detect the risks of damage and leakage of the water supply and drainage pipeline and the risk of more than 3 meters of buried depth (particularly the risk of karst), however, the two factors are closely related to the relationship of road surface collapse. Therefore, the two factors are listed in the detection range, so that the operation of preventing the road surface from collapsing in the underground engineering construction of the karst mountain city is facilitated. Through a plurality of engineering practices, the process is proved to be necessary to be listed in a working range.
5) The invention extends the period of the road collapse prevention work from the construction stage to the pre-construction stage and the post-construction stage, namely, the overall situation of the field is comprehensively evaluated before construction, the construction influence is dynamically controlled during construction, and the influence of the constructed underground engineering on the surrounding environment is evaluated after construction.
6) The geological advanced prediction work aiming at the tunnel face and the ground detection work are combined to carry out comprehensive analysis, so that the accuracy and precision of data interpretation are improved, and the guidance of safe construction is facilitated.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a technical flow chart of the post-construction stage of the present invention.
FIG. 2 is a flow chart of the construction stage technique of the present invention.
FIG. 3 is a technical flowchart of the post-construction stage of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
As shown in figures 1-3, the invention discloses a method for preventing road surface collapse in the construction of underground engineering in karst mountain cities, which is characterized by comprising three stages of construction before, construction during and after, wherein the three stages comprise the following steps:
the construction early stage:
the main technical purpose of the pre-construction stage is to find out the development conditions of adverse geological risks such as karst, soil cavern, road surface void, porosity and rich water before construction, to find out early treatment, to reduce the risk influence to the minimum, and the pre-construction stage comprises the following steps:
step 1, collecting data of a construction environment, and carrying out on-site investigation and recheck;
step 2, according to the design scheme and the construction organization scheme of the underground engineering, selecting an engineering geophysical prospecting method, arranging geophysical prospecting lines, selecting data acquisition parameters, carrying out ground comprehensive geophysical prospecting general survey, carrying out drilling verification according to the general survey result, and finding out the underground karst development condition and the soil cave development condition before construction so as to supplement earlier-stage survey data;
step 3, exploring the risks of damage and leakage of the water supply and drainage pipeline, the risk of the buried depth being less than 3 meters and the risk of the buried depth being more than 3 meters, and carrying out engineering treatment on the existing risks;
and 4, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, and verifying and analyzing again if the treatment effect is abnormal.
The middle stage of construction:
the main technical purpose of the construction middle stage is to dynamically follow up the construction progress so as to ensure the safety of the road surface in construction, and the construction middle stage comprises the following steps:
step 1, carrying out one-time comprehensive detection on the whole construction site at regular intervals, wherein the detection contents comprise: the risk of damage and leakage of the water supply and drainage pipeline and the risk of the burial depth being less than 3 meters and the risk of the burial depth being more than 3 meters; taking a quarter as a period, carrying out one-time comprehensive detection on the whole field; taking 30-60 meters as a cycle, carrying out dynamic follow-up detection according to the tunnel face tunneling condition, and mainly carrying out a multi-channel radar technology or a three-dimensional radar technology to detect the shallow risk with the buried depth of less than 3 meters;
step 2, timely mastering advanced geological forecast results and tunnel face excavation exposure conditions, timely carrying out comprehensive geological analysis when advanced geological forecast data is inconsistent with an early detection result, and carrying out retesting if necessary; when karst is revealed and construction abnormalities such as tunnel face collapse, mud outburst, water burst and the like occur, shallow layer detection aiming at the risk that the buried depth is less than 3 meters is carried out in real time, if pavement void and soil cave risks are not found, then deep layer detection aiming at the risk that the buried depth is more than 3 meters is carried out, the development condition of deep diseases is determined, and engineering treatment is carried out on risk points;
and 3, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, and verifying and analyzing again if the treatment effect is abnormal.
And (3) post-construction stage:
the main technical purpose of the post-construction stage is to find out the risks still existing in the construction influence range and the damage and leakage conditions of tap water, rainwater and sewage pipelines during the period from the completion of construction to the start of trial operation of a project, and provide a reasonable treatment suggestion; the construction unit verifies the disposal effect in time after disposing and takes the disposal effect as the basic data for acceptance of the completion of the civil engineering, and the post-construction stage comprises the following steps
Step 1, regularly detecting the risks of damage and leakage of a water supply and drainage pipeline, the burial depth of the water supply and drainage pipeline is less than 3 meters, and the burial depth of the water supply and drainage pipeline is more than 3 meters; half a year is a period, and one-time comprehensive detection is carried out on the whole field;
and 2, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, if the risk points are abnormal, verifying and analyzing again, and evaluating the ground stability and the influence on the surrounding environment.
In the step 3 of the pre-construction stage, aiming at the risk that the buried depth is less than 3 meters, a three-dimensional radar or multi-channel radar technology is adopted to find out the conditions of road surface void, looseness and water enrichment before construction, and drilling verification is carried out; finding out the condition of roadbed soil caverns and karsts before construction by adopting a large-depth-finding ground penetrating radar, a micro-motion exploration method or a direct current method and performing drilling verification; the leakage detector, the pipeline periscope and the pipeline television detection technology are adopted to find out the damage and leakage conditions of tap water, rainwater and sewage pipelines and find out the occurrence reasons of roadbed diseases before construction.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention without departing from the technical spirit of the present invention are within the scope of the present invention.
Claims (4)
1. A method for preventing pavement collapse in karst mountain city underground engineering construction is characterized by comprising three stages of construction before, construction during and construction after, wherein the three stages comprise the following steps:
the construction early stage:
step 1, collecting data of a construction environment, and carrying out on-site investigation and recheck;
step 2, according to the design scheme and the construction organization scheme of the underground engineering, selecting an engineering geophysical prospecting method, arranging geophysical prospecting lines, selecting data acquisition parameters, carrying out ground comprehensive geophysical prospecting general survey, carrying out drilling verification according to the general survey result, and finding out the underground karst development condition and the soil cave development condition before construction so as to supplement earlier-stage survey data;
step 3, exploring the risks of damage and leakage of the water supply and drainage pipeline, the risk of the buried depth being less than 3 meters and the risk of the buried depth being more than 3 meters, and carrying out engineering treatment on the existing risks;
step 4, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, and if the risk points are abnormal, verifying and analyzing again;
the middle stage of construction:
step 1, carrying out one-time comprehensive detection on the whole construction site at regular intervals, wherein the detection contents comprise: the risk of damage and leakage of the water supply and drainage pipeline and the risk of the burial depth being less than 3 meters and the risk of the burial depth being more than 3 meters;
step 2, timely mastering advanced geological forecast results and tunnel face excavation exposure conditions, timely carrying out comprehensive geological analysis when advanced geological forecast data is inconsistent with an early detection result, and carrying out retesting if necessary; when karst is revealed and construction abnormalities such as tunnel face collapse, mud outburst, water burst and the like occur, shallow layer detection aiming at the risk that the buried depth is less than 3 meters is carried out in real time, if pavement void and soil cave risks are not found, then deep layer detection aiming at the risk that the buried depth is more than 3 meters is carried out, the development condition of deep diseases is determined, and engineering treatment is carried out on risk points;
step 3, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, and if the risk points are abnormal, verifying and analyzing again;
and (3) post-construction stage:
step 1, regularly detecting the risks of damage and leakage of a water supply and drainage pipeline, the burial depth of the water supply and drainage pipeline is less than 3 meters, and the burial depth of the water supply and drainage pipeline is more than 3 meters;
and 2, rechecking the treatment effect in time aiming at the risk points after the engineering treatment, if the risk points are abnormal, verifying and analyzing again, and evaluating the ground stability and the influence on the surrounding environment.
2. The method for preventing road surface collapse in karst mountain city underground engineering construction according to claim 1, characterized in that: in the step 3 of the pre-construction stage, aiming at the risk that the buried depth is less than 3 meters, a three-dimensional radar or multi-channel radar technology is adopted to find out the conditions of road surface void, looseness and water enrichment before construction, and drilling verification is carried out; finding out the condition of roadbed soil caverns and karsts before construction by adopting a large-depth-finding ground penetrating radar, a micro-motion exploration method or a direct current method and performing drilling verification; the leakage detector, the pipeline periscope and the pipeline television detection technology are adopted to find out the damage and leakage conditions of tap water, rainwater and sewage pipelines and find out the occurrence reasons of roadbed diseases before construction.
3. The method for preventing road surface collapse in karst mountain city underground engineering construction according to claim 1, characterized in that: in the middle construction stage, one quarter is taken as a period, and one comprehensive detection is carried out on the whole field; and in the post-construction stage, one half year is a period, and one-time comprehensive detection is carried out on the whole field.
4. The method for preventing road surface collapse in karst mountain city underground engineering construction according to claim 1, characterized in that: in the middle stage of construction, 30-60 meters are taken as a cycle, dynamic follow-up detection is carried out according to the tunnel face tunneling condition, and the key point is to carry out a multi-channel radar technology or a three-dimensional radar technology so as to detect the shallow risk with the buried depth of less than 3 meters.
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2021
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Application publication date: 20220128 |