Roadbed karst collapse comprehensive renovation method

Abstract

The invention discloses a roadbed karst collapse comprehensive renovation method which comprises the following steps: 1, geology in a line range is explored, and karst development conditions are determined in combination with drilling coring and a pressurized-water test; 2, inclined holes and straight holes are drilled in the karst section, the inclined holes are formed in one row on each side ofthe line and obliquely drilled towards the center of the line, and the straight holes are formed in two rows on each side of the line and located in the outer sides of the inclined holes; 3, after drilling is completed, grouting pipes and grout return pipes are arranged for the inclined holes and the straight holes, and hole sealing is conducted; and 4, conducting pressure grouting on the inclinedholes and the straight holes. According to the method, soil cracks and karst caves under the roadbed surface are filled through inclined hole grouting, and roadbed surface collapse under the action of train loads is prevented; the problem of subgrade surface collapse caused by soil body fine material loss due to dynamic water change is solved through straight hole waterproof curtain grouting, thesubgrade karst treatment effect is remarkable, the construction cost is low, the period is short, and the influence on existing railway operation is small.

Description

technical field [0001] The invention relates to the field of roadbed karst reinforcement, in particular to a method for comprehensive treatment of oblique hole grouting and straight hole water-stop curtain applied to existing railway roadbed karst collapse. Background technique [0002] The development of karst in Southwest my country is very serious, and karst disasters occur continuously, causing huge loss of life and property. With the rapid construction of high-speed railways, the requirements for roadbed stability and settlement continue to increase. Due to the action of karst caves and groundwater flow, the roadbed collapses, which seriously endangers the safety of train operation. How to effectively prevent the occurrence of roadbed collapse is of great significance. [0003] At present, the subgrade in karst areas often adopts single improvement measures such as pile-slab structure spanning and drilling and grouting. However, the main problem of the pile-slab struct...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high construction cost, long cycle and poor effect of existing railway subgrade karst collapse treatment, and provide a comprehensive treatment method for subgrade karst subsidence, which uses inclined hole grouting and straight hole water-stop curtain for subgrade karst subsidence Comprehensive improvement, the effect of comprehensive control is remarkable, the construction cost is low, the cycle is short, and the impact on the existing railway operation is small

Images