Method for treating karst cave area foundation through dynamic compaction

A karst cave and foundation technology, applied in the field of transportation, can solve the problems of collapse and the stability of karst cave can not be achieved, and achieve the effect of low price, saving engineering cost and survey cost, and preventing collapse risk.

Active Publication Date: 2020-11-27
HUNAN UNIV
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Problems solved by technology

However, the stability of some karst caves cannot actually meet the road requirements, resulting in the risk of collapse

Method used

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  • Method for treating karst cave area foundation through dynamic compaction
  • Method for treating karst cave area foundation through dynamic compaction
  • Method for treating karst cave area foundation through dynamic compaction

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Embodiment Construction

[0031] The technical solutions of the present invention will be described in detail below through specific embodiments.

[0032] 1. In order to find out the breakdown mechanism of different karst cave spans, the invented karst cave covering layer is 4m thick, the karst cave roof is 1m thick, and the span-thickness ratio λ is 4-8 respectively. 2.6m) tamping can carry out numerical simulation of dynamic tamping, and analyze the failure mode of the cave roof under different conditions.

[0033] The breakdown of the cave roof rock is the result of continuous accumulation of internal damage during the dynamic compaction process. In order to reveal the damage and even the breakdown process of the cave roof under the action of dynamic compaction, the present invention uses FISH language to write subroutines, and uses disks to represent the occurrence of intergranular fractures. Micro-cracks, monitoring the bonding between rock particles, realizing the tracking and display of rock mic...

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Abstract

The invention discloses a method for treating a karst cave area foundation through dynamic compaction. The method comprises the following steps: 1, determining the characteristics of a karst cave of aconstructed road section; 2, selecting preset dynamic compaction parameters to carry out large-area dynamic compaction on the karst cave area; 3, obtaining the upper limit of the span of the non-broken karst cave roof of the constructed road section according to the thickness of the covering layer and the dynamic compaction parameters; 4, according to the upper limit of the karst cave roof span and the rock-soil parameters, applying embankment and vehicle loads to the foundation of the constructed road section for stability checking calculation; and if the stability checking calculation doesnot pass, arranging a bidirectional reinforcement continuous concrete slab on the pavement base layer for reinforcement, so that the purpose of treatment is achieved. According to the method, the upper limit of the span of the roof without breaking the karst cave can be quickly determined according to the thickness of the covering layer and ramming energy, so that the karst cave span does not needto be investigated by drilling a large number of holes, and investigation cost and investigation time are saved; and the method has the advantages of being low in price, high in construction speed and capable of shortening the construction period and saving engineering cost and investigation cost.

Description

technical field [0001] The invention belongs to the field of traffic, and in particular relates to a method for treating foundations in karst cave areas with dynamic compaction. Background technique [0002] The subgrade in the cave area will face the risk of subsidence of the underlying unexplored caves during operation, so hidden caves need to be detected, evaluated and treated during construction. The difficulty of treating hidden karst caves is not how to deal with them, but how to accurately ascertain the geometric dimensions of the karst caves. Commonly used cave detection methods include drilling and geophysical prospecting. Geophysical prospecting can theoretically detect the spatial characteristics of caves, but due to the limitation of technological development level and the complexity of rock and soil media, the actual effect is not satisfactory. Drilling can find out parameters such as buried depth, height and roof thickness of the cave, but even a large number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F30/23E02D3/046G06F119/14
CPCG06F30/13G06F30/23E02D3/046G06F2119/14
Inventor 刘晓明王艺钢赵明华陈仁朋黎莉蒋德松赵衡肖尧杨超炜曹文贵
Owner HUNAN UNIV
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