Processing method of hidden type sink hole under railway road bed in karst terrain
A technology of railway subgrade and treatment method, which is applied to roads, fills, tracks, etc., can solve problems such as pollution of the environment and loss of cement slurry, and achieve the effects of protecting the ecological environment, avoiding loss and saving project investment.
Active Publication Date: 2017-11-03
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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[0004] The purpose of this invention is to provide a treatment method for concealed sinkholes under the railway embankment in karst areas, so as to solve the problems of serious loss of cement slurry and environmental pollution
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[0024] The present invention will be described in detail below in combination with specific embodiments.
[0025] The method for treating the concealed sinkhole under the railway embankment in the karst area of the present invention firstly determines the plane position of the concealed sinkhole, then constructs the shaft, pours rubble, and pours low-grade concrete or cement slurry after the rubble supports the bottom. Specifically include the following steps:
[0026] Step 1: Carry out the drilling construction of the test hole in the karst area. After the test hole is drilled, determine the location of the karst cave under the drilled ground through the core, use downhole cameras to observe the shape of the karst cave, and determine that there is a hidden hidden hole connected to it at the bottom of the karst cave. type sinkhole;
[0027] Step 2: Inject controllable cement slurry into the test hole. During the grouting process, the grouting surface was continuously checke...
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The invention relates to a processing method of a hidden type sink hole under a railway road bed in a karst terrain. When a karst foundation collapses, the railway road bed is destabilized, and the operation safety of a railway is threatened, so that cement grout is injected to the karst foundation. The processing method comprises the following steps of firstly, determining the plan position of the hidden type sink hole; constructing a silo; dumping cleft stones; and after the cleft stones are bottomed, pouring low-grade concrete or cement grout. Compared with a conventional karst grouting, the processing method disclosed by the invention basically prevents the cement grout from running off after the cleft stones are bottomed, so that construction investment is saved, and the ecological environment is protected; and after the hidden type sink hole is stuffed with the cleft stones, a cleft stone accumulating body is large in pores, so that the drainage function of the hidden type sink hole can be partly reserved.
Description
technical field [0001] The invention belongs to the technical field of road construction in karst areas, and in particular relates to a treatment method for concealed sinkholes under railway subgrades in karst areas. Background technique [0002] The collapse of karst foundation directly threatens the safety of railway operation. Therefore, the karst foundation under the railway subgrade base is generally treated by the method of "exploring first, then filling, and combining exploration and irrigation". [0003] In order to avoid the horizontal runoff in the karst area, the railway line is relatively high, and most of them run on the halfway up the mountain. The karst foundation under the subgrade base not only has horizontal and obliquely developed karst caves and troughs, but also vertically developed concealed sinkholes. In general, the bottom of concealed sinkholes are connected with the lower karst caves and troughs, and the bottom of concealed sinkholes has good conne...
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IPC IPC(8): E01B2/00E02D17/18
CPCE01B2/006E01B2204/08E02D17/18
Inventor 曹元平孟祥连冯威王应铭李茂春刘卫斌甘传奇王军辉汪浩
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP