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A Method of Determining the Coefficient of Horizontal Subgrade in Side Pressure Test

A technology of side pressure test and foundation bed coefficient, which is applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of complex formula and difficult application, achieve simple formula, reduce test difficulty, and improve accuracy Effect

Active Publication Date: 2019-10-08
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects that the existing measurement method mentioned in the above-mentioned background technology needs to obtain other test parameters to obtain the bed coefficient and the existing calculation method formula is relatively complicated and difficult to apply, and provides a method for determining side pressure Method for testing horizontal subgrade coefficient

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  • A Method of Determining the Coefficient of Horizontal Subgrade in Side Pressure Test

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] The test method of the lateral pressure test horizontal bed coefficient of the present embodiment may further comprise the steps:

[0030] 1. Install equipment: Level the test site, install the drilling rig equipment, and level the equipment to ensure that the verticality of the drill pipe meets the requirements during the drilling process.

[0031] 2. Mud preparation: At present, the pre-drilling side pressure test is mainly used in hard plastic to hard cohesive soils, dense sandy soils, and rock formations with relatively good pore-forming quality. No special mud is required. For this type of soil, it can be used clean water instead of mud;

[0032] For the sandy soil, silt and soft soil where the hole wall is easy to collapse, since this type of soil is easy to collapse, it is difficult to form a drill hole with a complete ...

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Abstract

The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for determining a pressuremeter test horizontal bedding coefficient. The method comprises the steps of drilling holes in a test site, arranging special mud protection walls for the drilled holes, measuring the relation of pressure and pressuremeter sizes, obtaining a p - delta r curve through conversion, then according to the p - delta r curve, obtaining initial pressure p0, critical edge pressure pF and respective corresponding pressuremeter radial displacements r0 and rF, and according to the parameters, calculating the horizontal bedding coefficient of the soil body. The whole test method is simple and fast, the difficulty for determining the horizontal bedding coefficient through a pressuremeter test can be drastically lowered, the precision of the horizontal bedding coefficient test is improved, and the method is beneficial to large-scale application and promotion.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for determining the coefficient of a horizontal foundation bed in a lateral pressure test. Background technique [0002] In recent years, with the rapid development of my country's infrastructure construction, underground space and tunnel engineering has become a key research field. At present, in the design of underground space and tunnel engineering, the "soil resistance method" (also known as the "vertical elastic foundation beam method") is usually adopted. The effect is simulated by the elastic resistance coefficient, and the deformation and internal force of the support structure are calculated according to the elastic foundation beam method. The elastic resistance coefficient of the soil in the passive zone inside the support structure is called the horizontal subgrade coefficient K h , is the key parameter of the "soil resistance ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20G06F2119/06
Inventor 涂启柱熊大生吴守富王忠华黄俊杰米军于廷新张燕沈峥
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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