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Calculation method of safety thickness of supporting layers of pile foundations of karst areas

A technology of safe thickness and calculation method, applied in calculation, special data processing applications, instruments, etc., can solve the problem of not considering the influence of self-weight structure and so on

Active Publication Date: 2015-07-29
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

[0016] However, the above scheme does not consider the influence of self-weight on the structure, and the tensile bending failure mode is simply described according to the theoretical mechanics formula

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  • Calculation method of safety thickness of supporting layers of pile foundations of karst areas
  • Calculation method of safety thickness of supporting layers of pile foundations of karst areas
  • Calculation method of safety thickness of supporting layers of pile foundations of karst areas

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0054] 1. Theoretical basis:

[0055] Assumption: In order to facilitate the analysis of the mechanism of action between the pile foundation and the karst roof, the two can be considered as a system. Considering that the failure of the karst roof is a typical brittle failure, which is safer, the model can be simplified to a rectangular plate subject to a mid-span concentrated load model (see figure 1), the roof strata generally may have three modes of punching failure, shear failure and bending-tension failure. And make the following basic assumptions:

[0056] (1) The rock mass around the cave is a continuous linear elastic body and the time effect is not considered, and the cave is stable in the natural state; (2) The rock mass around the cave is a uniform isotropic material; (3) The analysis does not include the The beneficial effects of fillings ...

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Abstract

The invention discloses a calculation method of safety thickness of supporting layers of pile foundations of karst areas. The calculation method comprises the following steps: step 1, establishing an assumed model, and simplifying the model; step 2, performing theoretical analysis on the safety thickness of the supporting layers; step 3, performing preliminary checking calculation on the safety thickness of the supporting layers; step 4, performing accurate checking calculation on the safety thickness of the supporting layers; step 5, judging whether the supporting layers satisfy calculation requirements. The calculation method disclosed by the invention is simple in calculation, facilitates design optimization of pile foundations, and is high in operability; in addition, through the adoption of the calculation method, the improvement of relevant norms is promoted, so that huge economic benefits and social benefits can be brought.

Description

technical field [0001] The invention relates to a method for judging the safe thickness of a bearing layer when a pile foundation is placed above a hollow area, in particular to a method for calculating the safe thickness of a bearing layer of a pile foundation in a karst area. Background technique [0002] my country's karst landforms are widely distributed and large in area. Due to the existence of karst caves, they are mostly in the form of dissolution, karst trenches, karst troughs, small and medium-sized beaded caves, or a single small karst cave fissure, which brings great difficulties to the design and construction of pile foundations in karst areas. Existing design codes and industry standards have few provisions on pile foundation design in karst areas, and the content is too abstract, or the requirements are too conservative, and the overall operability is not strong. In order to ensure the quality of the pile foundation, the design principle of "one column, one p...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 柏华军
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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