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Karst area karst cave overlaying soil grouting reinforcement structure and designing method thereof

A technology of grouting reinforcement and design method, which can be used in infrastructure engineering, soil protection, construction, etc., and can solve problems such as difficulty in dealing with deep buried karst caves.

Inactive Publication Date: 2017-09-19
江西省交通科学研究院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Karst area karst cave overlaying soil grouting reinforcement structure and designing method thereof
  • Karst area karst cave overlaying soil grouting reinforcement structure and designing method thereof
  • Karst area karst cave overlaying soil grouting reinforcement structure and designing method thereof

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Embodiment approach

[0035] like figure 1 As shown, a grouting reinforcement structure for the overlying soil layer of a karst cave in a karst area, which includes limestone 14, karst cave 15, consolidated grouting layer 16, breccia 17, silty clay 18 and roadbed filling 19 from bottom to top . The consolidated grouting layer 16 needs to use grouting equipment, which is formed by grouting and consolidating from the borehole 13 into the breccia 17, and the thickness is generally 5-8m.

[0036] The actual distribution length of the consolidated grouting layer 16 and the karst cave 15 is consistent, and the width is calculated according to the width of the bottom of the subgrade, and the width d of the impact of the collapse is added. The depth of the borehole 13 is 2m above the earth-rock interface 20, and is divided into two types: vertical hole and inclined hole. The influence width d, the grouting diffusion width w, etc. are calculated.

[0037] A method for designing a grouting reinforced stru...

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Abstract

The invention provides a karst area karst cave overlaying soil grouting reinforcement structure and a designing method thereof. The karst area karst cave overlaying soil grouting reinforcement structure comprises limestone, a karst cave, a consolidation grouting layer, rubble clay, silty clay and roadbed filled soil sequentially from bottom to top. The consolidation grouting layer needs a groutingdevice and is formed by grouting consolidation in the rubble clay from a drilled hole, and the thickness is usually 5-8 m. The actual distribution lengths of the consolidation grouting layer and thekarst cave are consistent, the width of the consolidation grouting layer is calculated according to the width of the bottom of a roadbed, and the collapse affecting width is accumulated. The karst area karst cave overlaying soil grouting reinforcement structure mainly has three advantages that firstly, water is discharged, a soil layer near a top board of the karst cave is improved to be in a plastic to hard-plastic state from a soft-plastic state, so that the erosion resistance is improved; secondly, the infiltration prevention capacity is improved, so that the change speed of an undergroundwater level is decreased; and thirdly, a slurry net is formed to extrude an adjacent soil body tightly, so that the modulus of the soil body is improved, the Poisson ratio is reduced, and the stress condition of the top board of the karst cave is improved.

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...

Claims

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Application Information

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IPC IPC(8): E02D3/12
CPCE02D3/12
Inventor 朱耀庭胡文华陈忠达张震张小明杨西海吴福泉刘超群王捷朱永波
Owner 江西省交通科学研究院
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