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A method for treating foundation in karst cave area by dynamic compaction

A technology of karst caves and foundations, which is applied in the field of transportation, can solve the problems of subsidence and karst cave stability, and achieve the effects of low price, saving engineering cost and survey costs, and preventing the risk of subsidence

Active Publication Date: 2022-04-12
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for treating foundation in karst cave area by dynamic compaction
  • A method for treating foundation in karst cave area by dynamic compaction
  • A method for treating foundation in karst cave area by 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 the foundation of a karst cave area by dynamic compaction, which comprises the following steps: step 1, determining the characteristics of the karst cave in the construction section; step 2, selecting preset dynamic compaction parameters to perform large-scale dynamic compaction on the karst cave area: step 3. Obtain the upper limit of the span of the unbroken karst cave roof of the construction section according to the thickness of the covering layer and the dynamic compaction parameters; Step 4. According to the upper limit of the karst cave roof span and geotechnical parameters, apply embankment and vehicle loads to the foundation of the construction section for stability check calculation ; If the stability check fails, set up two-way reinforced continuous concrete slabs at the base of the pavement for reinforcement, so as to achieve the purpose of treatment. The present invention can quickly determine the upper limit of the roof span of the unbroken karst cave according to the thickness of the covering layer and the tamping energy, so that it is not necessary to drill a large number of holes to investigate the span of the karst cave, which saves the investigation cost and investigation time; it has the advantages of low price and fast construction speed. It can speed up the construction period and save the project cost and survey 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 Patents(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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