A Grouting Reinforcement Structure and Design Method for the Overlying Soil Layer of Karst Cave in Karst Area

Abstract

The invention provides a grouting reinforcement structure for the overlying soil layer of a karst cave in a karst area and a design method thereof. The consolidated grouting layer needs to use grouting equipment, and is formed by grouting and consolidating into the breccia from boreholes, and its thickness is generally 5-8m. The consolidated grouting layer is consistent with the actual distribution length of the karst cave, and the width is calculated according to the width of the bottom of the subgrade, and the width affected by the collapse is accumulated. The grouting reinforcement structure of the overlying soil layer in the karst cave in the karst area of ​​the present invention mainly has three advantages. One is to drain water and improve the soil layer near the roof of the cave from a soft plastic state to a plastic to a hard plastic state, thereby improving the ability to resist erosion and erosion. The second is to improve the anti-seepage capacity, thereby slowing down the change speed of the groundwater level; the third is to form a slurry vein network to compact the adjacent soil, thereby increasing the soil modulus, reducing Poisson's ratio, and improving the stress on the roof of the cave.

Description

technical field [0001] The invention relates to foundation reinforcement technology in the field of rock and soil, in particular to a technology for treating the overlying soil layer of karst caves in karst areas. Background technique [0002] In the past, karst foundation treatment technology was devoted to strengthening karst caves, mainly including blasting backfill, filling, dynamic compaction, grouting and other measures, but all of them were only suitable for shallow karst caves. In case of deeply buried karst caves, if drilling and blasting is used, although the roof of the karst cave can be blasted, the overlying soil layer will collapse and the blasting hole will be easily buried. Even if the blasting is successful, due to the deep burial, if manual or mechanical methods are used for backfilling, there will be greater risks. If the way of dynamic compaction is adopted, because the effective compaction depth is limited, there is nothing that can be done for this dee...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing foundation treatment technology in karst areas is difficult to deal with deep-buried karst caves, the present invention provides a design and calculation method for the grouting reinforcement structure of the overlying soil layer in karst caves

Images