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Composite anti-seepage structure and construction method of large karst cave in karst area

A large-scale karst cave and composite anti-seepage technology, which is applied in the direction of basic structure engineering, buildings, sheet pile walls, etc., can solve the problems of difficult construction period guarantee, large manpower and financial resources, and large engineering volume, and achieve low construction strength, less input materials, The effect of improving construction efficiency

Active Publication Date: 2017-05-03
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the large or extra-large karst caves encountered in the anti-seepage treatment process of water conservancy and hydropower projects, the excavation and backfill method is used to deal with it, which requires a large amount of engineering, large investment, and many construction areas. If the anti-seepage line is temporarily modified, it needs to be rebuilt In addition to the above disadvantages, the anti-seepage design will consume more manpower and financial resources, and the construction period is difficult to guarantee

Method used

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  • Composite anti-seepage structure and construction method of large karst cave in karst area

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Effect test

Embodiment 1

[0050] There is a karst cave 2. The karst cave 2 develops along the middle of the anti-seepage line. It is 47m long and 51m wide along the anti-seepage axis. The thickness of the karst cave filling is 29m-41m. 3 , which is a giant karst cave with filled halls. The fillings are mainly clay and silty clay, and there are partially dissolved broken stones. The original treatment plan was to backfill concrete after excavating all the fillings. However, due to the difficulty in the layout of the construction branch holes after the disclosure, the estimated construction period is as long as 30 months, the processing cost budget is as high as 71 million yuan, and there are many hidden dangers in construction safety. state. After long-term theoretical research and repeated site surveys, a more effective construction method has been summed up for the above-mentioned karst caves and similar karst caves. The construction steps are as follows:

[0051] ①Clean the surface of the cave 2, le...

Embodiment 2

[0063] In the steps described in Embodiment 1, the step ② can also adopt the following arrangement:

[0064] On the anti-seepage axis and on the downstream karst cave filling area 3, two rows of filling swirl holes 7 are arranged symmetrically, with a row distance of 1.0m, and steel pipes are installed between two adjacent filling swirl holes 7 in each row Pile 6, so that the distance between each filling spray hole 7 and the adjacent steel pipe pile 6 is 0.8m, and at least two rows of long-orifice pipes 8 are installed in the steel pipe pile 6, and the long-orifice pipe 8 and the steel pipe pile 6 The lower ends of the pipe piles 6 are all 3-5m deep into the bedrock; the high-pressure pouring process is used to pour concrete into the steel pipe pile 6 and the long-orifice pipe 8 under high pressure, and at the same time, the high-pressure rotary spraying process is used to pour concrete into the rotary spray hole 7 of the filling. The high-pressure rotary spraying makes it fl...

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Abstract

The invention discloses a composite seepage preventing structure for a large karst cave in a karst region and a construction method thereof, and belongs to the technical field of water conservancy and hydropower engineering. The composite seepage preventing structure comprises bed rock and the karst cave. The karst cave is located in the bed rock. The lower section of the karst cave is filled to form a karst filling area. A plurality of filling-material rotary jetting holes or steel pipe piles are vertically distributed in the karst cave filling area and arranged along the seepage preventing axis at intervals in a rowed mode. A transition cushion layer is arranged on the upper surface of the karst cave filling area. A concrete seepage preventing wall is arranged on the steel pipe piles. A cavity in the upstream side of the concrete seepage preventing wall is backfilled to form a backfilling area. According to the technical scheme, due to the reasonable construction method, the concrete seepage preventing wall is built in the karst cave, and the quite good partition effect and the quite good sealing effect are achieved through a karst cave roof joining groove structure in the top and a grouting-cave-aligning-grouting method; the structure and the method are simple, the quantity of input materials is small, construction intensity is small, construction efficiency is greatly improved, and the seepage preventing aim of large karst cave in the karst region is achieved.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and relates to a filling large-scale karst cave anti-seepage technology in the construction of water conservancy and hydropower projects in karst areas, in particular to a composite anti-seepage structure and construction method for large-scale karst caves in karst areas. Background technique [0002] Karst caves belong to one type of many karst forms, which are the result of long-term groundwater dissolution, that is, near-horizontal groundwater channels formed by karstification during the relatively stable period of crustal ups and downs, and caves formed by crustal uplift movement. There are many classification methods of karst caves. According to the shape, they can be divided into hall-type, pipeline-type and fissure-type karst caves. According to the height of karst caves, they can be divided into giant (height greater than 10m), large (height 5-10m), med...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D19/12E02D19/18E02D5/18
Inventor 屈昌华
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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