CN208039180U - A kind of debris flow device - Google Patents

Abstract

The utility model belongs to the technical field of water conservancy engineering and discloses a mud-rock flow prevention device. The mud-rock flow prevention device is provided with a plurality of retaining dams built on the main mud-rock flow ditch; each watershed of the main mud-rock flow ditch is formed with a branch mud-rock flow ditch. Gufang dam is built on the debris flow ditch of the branch road; several rows of guide grooves are integrated on the dam body of the retaining dam; the downstream channel of the retaining dam is close to the diversion embankment. The system uses retaining dams and Gufang dams to cooperate with the main and branch debris flow ditch to strengthen the blocking of solid loose objects in the upstream debris flow, raise the erosion base level of the main ditch, widen and increase the cross section, and reduce debris flow and flood water. At the same time, stabilize the existing ditch bed deposits to reduce the impact and harm of debris flow on the downstream. In order to block the source of debris flow over the dam, make it silt back, enhance the stability of the dam foundation, and bring great development to politics and people's livelihood.

Description

A mud-rock flow prevention device

technical field

The utility model belongs to the technical field of water conservancy engineering, in particular to a debris flow prevention and control device.

Background technique

The debris flow ditch in Ji Town, Awang Town includes the Awang Xiaohe debris flow ditch and the Huangjiawan debris flow ditch, which belong to the upper reaches of the Xiaojiang River Basin, and the Awang Xiaohe debris flow ditch belongs to the Xiaojiang first-level tributary ditch. Awang Creek is a developmental debris flow ditch. According to the survey, Awang Creek had debris flow disasters in 1984, 1993, 1998, 2007, and 2011. Among them, a large-scale debris flow occurred on July 13, 1998. The previous debris flows jointly formed a 0.62km ² debris flow accumulation fan downstream. This mudslide disaster caused 2 deaths, washed away 380 acres of silted farmland, washed away 3 houses, 250m of canals, 2 highway bridges and culverts, 1 railway bridge and culvert and 150m of railway embankment, causing direct economic losses of more than 1 million yuan, and Threatened the safety of more than 1,700 people in Ngawang Market Town and Ngawang Railway Station, and 25.63 million yuan in fixed assets. At about 23:00 on the evening of June 14, 2011, there was a sudden heavy rain in Awang Town, which lasted for about 2 hours, causing the upstream original village group road and some loose materials to collapse. accumulation body. There are still a large amount of loose solid matter in the upstream. If there is a sudden rainstorm, a large amount of loose solid matter (spoiled soil, etc.) in the upstream will flow down the Zhongshan Valley to the market town, and may affect the safety of Awang market town and some downstream villages and farmland. . At the same time, the continuous development of rural construction has increased the source of certain solid materials, and the possibility of triggering debris flow disasters under heavy rain conditions has increased, posing threats to the life and property of villagers in Ngawang Market Town and the watershed, as well as roads and railways. After the outbreak of mudslides in the Awang Creek, it is easy to cause heavy losses of mass casualties and injuries, affect social stability and unity, and cause extremely serious adverse social and political impacts. The loss and impact are irreparable and cannot be estimated. At the same time, it also restricts the long-term The need for sustainable development and the urgent need for its prevention and control. Therefore, the prevention and control of debris flow in Ngawang Creek is necessary and urgent.

In summary, the existing problems in the prior art are: there is no prevention and control system for mudslides, and after the outbreak of mudslides, it is easy to cause heavy losses of mass casualties and injuries, affect social stability and unity, and cause extremely serious adverse social and political impacts. Losses and impacts are irreparable and irreversible, and at the same time restrict the long-term sustainable development needs of Awang Town, and its prevention and control needs are urgent.

Contents of the invention

Aiming at the problems existing in the prior art, the utility model provides a debris flow prevention and control device.

The utility model is achieved in this way, a debris flow prevention and control device, the debris flow prevention and control device is provided with a number of retaining dams built on the main debris flow ditch;

A branch debris flow ditch is formed in each watershed of the trunk debris flow ditch, and a Gufang dam is built on the bypass debris flow ditch;

There are several rows of guide grooves integrated on the dam body of the retaining dam;

The downstream channel of the retaining dam is close to the diversion embankment.

Further, the crest elevation of the Gufang dam is 1764m, with a total length of 22m, a total height of 6m, and a net height of 4m; the elevation of the crest of the Gufang dam in the lower reaches is 1774m, with a total length of 16.8m, a total height of 6m, and a net height of 4m; the most downstream Gufang dam crest The elevation is 1788m, the total length is 9m, the total height is 6m, and the net height is 4m.

Further, the height of the retaining dam is determined to be 10.5-15m. According to the characteristics of debris flow prevention and control, the main purpose, purpose, construction difficulty, dam body form, masonry materials, combined with field survey, debris flow characteristics, distribution of solid loose accumulations, landslide location, and topographical address conditions, the retaining dam, Gufang Dam is mainly deployed in the debris flow formation area.

Combined with the gully beds of Awang Xiaohe debris flow ditch and Huangjiawan debris flow ditch (N1 debris flow ditch and N2 debris flow ditch) and the existing topography and source distribution, 6 retaining dams were built in the ditch of the Awang Xiaohe debris flow formation area. Four retaining dams will be built in the Huangjiawan debris flow ditch. The goal is to strengthen the retention of solid loose objects in the upstream debris flow, raise the erosion datum level of the main ditch, widen and increase the cross-section of the water, reduce the hydrodynamic conditions of debris flow and floods, and at the same time stabilize the existing dams. Ditch bed deposits to reduce the impact and harm of debris flow on the downstream. In order to block the source of debris flow over the dam, make it silt back, and enhance the stability of the dam foundation, auxiliary dams are installed downstream of the rest of the dams except L6. Among them, because the rocks around the L6 retaining dam are hard and moderately weathered limestone and there is a rural road passing not far away, it is considered not to set up an auxiliary dam.

Build 3 Gufang dams at the branch ditches near Feidi Village to strengthen the stability of loose material sources in the ditches, carry out slag retention and bank revetment stabilization for debris flows, and block larger-sized solid matter in debris flows upstream , reduce the hydrodynamic conditions of the debris flow, reduce the fluid density of the debris flow, adjust the discharge peak volume and the total amount of solid matter of the debris flow, and weaken the debris flow. This can prevent the ditch from becoming steeper and steeper after the material in the ditch is continuously eroded, which will affect the safety of the road passing through the ditch head, and can reduce the leakage of the material in the ditch to form a new source of debris flow and protect the villagers and houses of Enclave Village safety of facilities.

The height of the retaining dam in this scheme is determined to be 10.5-15m, and the height of the Gufang dam is determined to be 6m. The specific layout of the retaining dam and Gufang dam is shown in the layout plan.

Further, the retaining dam adopts a trapezoidal dam body.

The flow depth of the overflow channel should not be too large, but should be wide and shallow, so as to minimize the ability to scour and damage the dam. The designed spillway has a trapezoidal section size, and the slope ratio of the side bank is 1:1. The calculation formula is as follows:

Qc＝(1.77B+1.42H)H ³ / ²

In the formula: Qc——debris flow flow through the overflow channel, m ³ /s;

B - the bottom width of the overflow channel, m;

H——The overflow depth of the overflow channel, m.

The utility model adopts the construction of the retaining dam and the Gufang dam on the trunk and branch mud-rock flow ditches to strengthen the blocking of solid loose objects in the upstream mud-rock flow, raise the erosion reference level of the main ditch, widen and increase the cross-section of the water, and reduce the mud-rock flow and flood hydrodynamic conditions, while stabilizing the existing ditch bed deposits to reduce the impact and harm of debris flow on the downstream. In order to block the source of debris flow over the dam, make it silt back, enhance the stability of the dam foundation, and bring great development to politics and people's livelihood.

Description of drawings

Fig. 1 is a schematic diagram of the distribution of the debris flow prevention and control device retaining dam and Gufang dam provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the position of the retaining dam in the river course of the debris flow prevention and control device provided by the embodiment of the utility model;

Fig. 3 is a structural schematic diagram of the guide groove of the debris flow prevention and control device provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of the positions of the diversion embankment and the retaining dam of the debris flow prevention and control device provided by the embodiment of the utility model;

In the figure: 1. Trunk debris flow ditch; 2. Retaining dam; 3. Branch road debris flow ditch; 4. Gufang dam; 5. River course;

Detailed ways

In order to further understand the invention content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are given below in conjunction with the accompanying drawings.

Below in conjunction with accompanying drawing, the structure of the present utility model is described in detail.

As shown in Figures 1-4, the debris flow prevention and control device provided by the embodiment of the utility model is provided with several retaining dams 2 built on the main debris flow ditch 1;

A branch debris flow ditch 3 is formed in each watershed of the trunk debris flow ditch 1, and a Gufang dam 4 is built on the bypass debris flow ditch 3;

The dam body of the retaining dam 2 is integrated with several rows of guide grooves 6;

The downstream channel 5 of the retaining dam 2 is close to the diversion embankment 7 .

As a preferred embodiment of the present utility model, the 4 top elevations of the Gufang dam are 1764m, with a total length of 22m, a total height of 6m, and a net height of 4m; The height is 4m; the elevation of the 4 tops of the most downstream Gufangba is 1788m, the total length is 9m, the total height is 6m, and the net height is 4m.

As a preferred embodiment of the present invention, the height of the retaining dam 2 is determined to be 10.5-15m.

As a preferred embodiment of the present invention, the retaining dam 2 adopts a trapezoidal dam body.

The debris flow prevention and control device of the present utility model is provided with a plurality of retaining dams 2 built on the main debris flow ditch 1. Debris flow and flood hydrodynamic conditions, while stabilizing the existing ditch bed deposits to reduce the impact and harm of debris flow on the downstream. In order to block the source of debris flow over the dam, make it silt back, and enhance the stability of the dam foundation; the Gufang Dam 4 is built on the debris flow ditch 3 of the branch road to strengthen the stability of the loose material source in the ditch, and carry out slag retention and bank protection for the debris flow. Slope, to block the larger-sized solid matter in the debris flow upstream, reduce the hydrodynamic conditions of the debris flow, reduce the fluid density of the debris flow, adjust the discharge peak volume of the debris flow and the total amount of solid matter, and weaken the debris flow. This can prevent the ditch from becoming steeper and steeper after the material in the ditch is continuously eroded, which will affect the safety of the road passing through the ditch head, and can reduce the leakage of the material in the ditch to form a new source of debris flow and protect the villagers and houses of Enclave Village safety of facilities.

There are several rows of guide grooves 6 integrated on the dam body of the retaining dam 2; the downstream channel 5 of the retaining dam 2 is close to the diversion embankment 7, and the purpose is to stabilize the discharge of solid loose matter in the ditch bed, prevent the channel from continuing to cut down, and slow down the longitudinal slope of the ditch bed. Reduce the hydrodynamic conditions of the debris flow, reduce the fluid density of the debris flow, and adjust the peak amount of the debris flow and the total amount of solid matter.

The control of mudslides in the market town of Awang Town can delay and curb the frequency and scale of mudslides, improve the ecological environment in the area, and ensure the safety of residents and infrastructure in Awang Market Town in the mudslide circulation area and accumulation area; eliminate the psychological hidden dangers of residents, Create a safe production and living environment for the local area. The control of mudslides in the market town of Awang Town is beneficial to the development of society and local economy, and has good social benefits.

The above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, All belong to the scope of the technical solution of the utility model.

Claims (4)

1. a kind of debris flow device, which is characterized in that the debris flow device is provided with construction in trunk mud-rock flow Several blocking dams on ditch；

Each basin of trunk debris flow gully is formed with branch debris flow gully, and being built on the branch debris flow gully has check dam dam；

Integration has several drainage grooves on the blocking dam dam body；

The blocking dam downstream river course closely trraning pole.

2. debris flow device as described in claim 1, which is characterized in that the check dam crest elevation is 1764m, overall length 22m, total high 6m, clear height 4m；Downstream check dam crest elevation is 1774m, overall length 16.8m, total high 6m, clear height 4m；Most downstream check dam Crest elevation is 1788m, overall length 9m, total high 6m, clear height 4m.

3. debris flow device as described in claim 1, which is characterized in that the blocking dam height of dam is determined as 10.5~ 15m。

4. debris flow device as described in claim 1, which is characterized in that the blocking dam uses trapezoidal dam body.