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Method for rapidly testing in situ foundation bearing capacity and deformation modulus

A technology of foundation bearing capacity and deformation modulus, which is applied in the field of foundation soil survey, foundation structure engineering, construction, etc., can solve the problems of time-consuming and cost, and achieve the effect of convenient use, low equipment purchase cost and fast testing

Inactive Publication Date: 2008-08-27
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0022] The present invention aims to solve the time-consuming and expensive problems existing in the in-situ testing technology of bearing capacity and deformation modulus of foundation soil, and find a more economical, fast, convenient and accurate rapid test method for bearing capacity and deformation modulus of foundation soil. testing method, so that the bearing capacity census test can be carried out in large-area foundations

Method used

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  • Method for rapidly testing in situ foundation bearing capacity and deformation modulus
  • Method for rapidly testing in situ foundation bearing capacity and deformation modulus
  • Method for rapidly testing in situ foundation bearing capacity and deformation modulus

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Experimental program
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Embodiment Construction

[0041] Scheme and technical principle of the present invention:

[0042] operation method

[0043] Lift a steel ball with a mass of 50kg to a certain height h (see the attached picture) with a simple tripod or other lifting equipment, let it fall freely, and then measure the depth 3 of the impact of the steel ball 1 into the ground (that is, the pressure pit below the ground) 2 depth). It is required to repeat three or more times in a site with similar soil layers, drop at different heights each time, and measure three different indentation depth values ​​(see attached figure).

[0044] Technical principle

[0045] The steel ball falls from a certain height and impacts the foundation. Under the elastic-plastic impact load, the impact energy of the steel ball is mainly used for the plastic deformation of the foundation soil layer. According to the law of energy conservation:

[0046] mgh = ∫ 0 δ ...

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Abstract

The invention relates to a rapid original position testing method of foundation bearing capacity and deformation modulus, which comprises the following step: a steel ball whose weight is m is lifted to a certain height by a tripod and freely falls, and then the depth delta that the steel ball is compacted to press into the ground is tested. The test is repeated three times or more in a same field, the falling height of each time is different, and the indentation depth values of different depth indentations which are formed when the steel ball falls in each time are correspondingly tested, then the ultimate bearing capacity and the deformation modulus of foundation soil are calculated through the contact mechanical basic theory. The rapid original position testing method is an economical, rapid, convenient and accurate original position testing method, and is capable of rapidly screening the foundation bearing capacity of a large area site.

Description

technical field [0001] The invention relates to a test method for the bearing capacity of a construction engineering foundation, in particular to an economical, fast and accurate in-situ testing method for the construction engineering foundation. Background technique [0002] The bearing capacity of the foundation refers to the ability of the foundation to bear the load of the foundation and the superstructure, and its size depends on two aspects: the foundation, the foundation and the superstructure. In engineering, two indicators are usually used to measure the bearing capacity of the foundation, namely the ultimate bearing capacity and the allowable bearing capacity of the foundation. The so-called ultimate bearing capacity refers to the corresponding base pressure when the foundation is about to fail, and the so-called allowable bearing capacity refers to the maximum base pressure allowed when the foundation meets the requirements of both strength and deformation (settle...

Claims

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Application Information

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IPC IPC(8): E02D1/02
Inventor 何思明
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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