Multi-cave collapse roadbed grouting treatment method

Abstract

The invention discloses a multi-cave collapse roadbed grouting treatment method. The method comprises the following process steps: (1) a grouting area is lofted by a geological radar for determining the depth and the range of caves to determine the grouting depth and range; (2) the row distance and the hole distance of grouting holes are determined according to the designed diffusion radius of slurry; (3) grouting pipes are arranged for reinforced grouting; and when the geological radar is adopted to monitor the slurry diffusion range in the grouting process to reach the designed diffusion radius of the slurry, water glass is injected to quickly solidify the slurry; and (4) after the water glass is injected, clear water is immediately used for flushing the grouting pipes to prevent the blockage; and then, the grouting is continued. Multiple times of grouting are performed by the steps to hoist a pavement to an original level. In the grouting process, the method is lower in cost and simple in process, can effectively prevent the slurry waste in the grouting process, and improves the grouting effect.

Description

technical field [0001] The invention relates to a grouting treatment method for multi-karst cave subsidence. Background technique [0002] my country has a vast territory, karst is widely distributed, and has various development types. In the carbonate distribution area, there are many karst caves of different shapes and sizes. Under the action, it will cause the cave to collapse. The cave will be filled with loose materials such as sand or gravel, and the strength is very low. Under the action of dynamic load, it will cause cracking of the road subgrade or road auxiliary structures, and local subsidence or collapse of the road surface. Paving roads in karst areas has always been a major problem in road construction. How to deal with the local subsidence of the road surface caused by the collapse of karst caves in the road is a critical and thorny problem. [0003] The traditional treatment methods of karst cave subgrade include excavation treatment, grouting treatment, cont...

AI Technical Summary

Problems solved by technology

Excavation treatment and continuous reinforced concrete slab collapse and reinforcement treatment for roads that have been opened to traffic require a long construction period and high cost, and the karst caves are generally deep, so it is unrealistic to excavate a large area of ​​the road surface; for the currently commonly used grouting methods in China, In the process of grouting, it is difficult to control the diffusion of grout, such as "Layered Multiple Pressure Regulating Grouting Method" (China National Invention Patent, Application No.: 200810014585.7, Publication No.: 101230570), "A Pulsed Grouting method” (China National Invention Patent, Application No.: 201310095222.1, Publication No.: 103161478A), but the uncertainty of the grout spreading underground during the grouting process or if there are caves underground will inevitably cause a large amount of grout to be wasted and the grouting effect will be reduced. not good

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