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Construction method and construction structure for earth-rock foundation in complex karst geology

A construction method and karst technology, applied in the direction of foundation structure engineering, filling, protection devices, etc., can solve the problems of easily disturbed foundation bearing layer, influence of foundation bearing capacity, damage to the force structure of the original bearing layer, etc. The effect of popularization and application, less workload, and enhanced stability

Pending Publication Date: 2021-07-23
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Problems solved by technology

It is necessary to carry out large-scale excavation for the area below the bearing area of ​​the foundation, and in the process of large-scale excavation, it is easy to disturb the bearing layer of the foundation, destroy the bearing structure of the original bearing layer, and have a huge impact on the bearing capacity of the foundation

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  • Construction method and construction structure for earth-rock foundation in complex karst geology

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Embodiment

[0013] refer to figure 1 , the present embodiment provides an earth-stone foundation construction structure in complex karst geology, the structure includes a graded sandstone cushion layer 2 constructed in the mud groove below the foundation 6, and a grade directly above the deep mud groove area 1 with a depth greater than 1.5B. The thickness of the sandstone cushion layer 2 is greater than or equal to 1.5B, and B refers to the long side of the foundation 6. The edge expansion area 21 of the graded sandstone cushion layer 2 is extended from the outer edge of the foundation 6, and the external extension is greater than or equal to 300mm. A concrete cushion 5 is also constructed between the gravel cushion 2 and the foundation 6 above, and the concrete cushion 5 extends outwardly of the foundation 6 by at least 150 mm.

[0014] The specific construction method is that when the foundation construction encounters uneven bearing layers and mud grooves, the mud grooves are cleaned f...

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Abstract

The invention provides a construction method and construction structure for an earth-rock foundation in complex karst geology. The method is characterized in that when a rugged bearing layer and a mud groove are encountered in foundation construction, the mud groove is cleaned at first; for a deep mud groove area with the depth greater than 1.5 B, a shallow mud groove area with the depth greater than or equal to 1.5 B and the depth smaller than or equal to 1.5 B is cleaned for completely cleaning mud; after the replacement and filling conditions are met, a graded gravel cushion layer is constructed, and B refers to the long edge of the foundation; the extension length of the edge expanding area of the graded gravel cushion layer from the outer edge of the foundation is greater than or equal to 300 mmm, so that the stress requirement of the foundation is ensured; and after the construction of the graded gravel cushion layer is completed, concrete cushion layers are constructed above the graded gravel cushion layer and right under the foundation, and the width of the concrete cushion layers is at least 150 mm larger than the outer edge of the foundation. The technical problem of the foundation construction in the karst geology is solved, and the defects in the prior art are overcome. The construction method and construction structure belong to the field of building foundation construction.

Description

technical field [0001] The invention relates to a construction method and construction structure of an earth-rock foundation in complex karst geology, and belongs to the technical field of building foundation construction. Background technique [0002] In areas with rich karst geological development, uneven bearing layers and mud troughs are prone to appear during building foundation construction, which brings great challenges to building foundation construction. It is necessary to carry out large-scale excavation for the area below the bearing area of ​​the foundation, and in the process of large-scale excavation, it is easy to disturb the bearing layer of the foundation, destroy the bearing structure of the original bearing layer, and have a huge impact on the bearing capacity of the foundation. Therefore, the construction technology and requirements for foundation treatment are quite strict. Therefore, it is urgent to invent a construction method and construction structur...

Claims

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Application Information

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IPC IPC(8): E02D17/18E02D31/02E02D31/04
CPCE02D17/18E02D31/02E02D31/04
Inventor 刘辉苏伟任远敏梁明凤魏太尧岳巍杨洋宋明林袁妹
Owner CCFED THE FIRST CONSTR & ENG
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