Discrimination method for foundation bearing capacity safety
A technology of foundation bearing capacity and discrimination method, which is applied in the field of foundation soil survey, foundation structure engineering, construction, etc., can solve the problems of one-sided inaccuracy of safety judgment, parameters relying on engineering experience, etc., and achieve good practical value and simple steps Effect
Active Publication Date: 2017-05-10
广东保顺检测鉴定有限公司
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[0005] The purpose of the present invention is to provide a method for judging the safety of foundation bearing capacity, which solves the problem that the parameters rely too much on engineering experience and the safety judgment is one-sided and inaccurate in the process of judging the safety of foundation bearing capacity
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[0065] The current code for design of building foundations (GB50007-2011) stipulates the allowable value of the bearing capacity safety factor F a is 2-3, while the slope design code for water conservancy and hydropower engineering (SL386-2007) stipulates that the safety factor of slope stability for different grades is F a In 1.1-1.3, it is obvious that the slope stability safety factor is safer than the bearing capacity safety factor, so we apply the slope stability analysis method to the foundation bearing capacity safety and stability analysis.
[0066] (1) Define a new safety factor F
[0067] Using the strength safety factor method in slope stability analysis, apply it to the safety and stability analysis of foundation bearing capacity, and define a new safety factor F, as shown in formulas (1)-(3),
[0068] c e =c / F (1)
[0069] f e = f / F (2)
[0070]
[0071] Among them, c is the cohesion of the soil, f is the internal friction coefficient, q is the actual bear...
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The invention discloses a discrimination method for foundation bearing capacity safety. The discrimination method includes the steps that a new safety factor F is defined; the relation between a reliability degree index beta and the safety factor F is established; by calculating etaF and etaR, when the etaR is approximately equal to the etaF, the safety factor allowed value meets universality. By utilizing the strength reduction safety factor method in slope stability analysis and unceasingly reducing the soil mass strength parameter till a foundation is damaged in the ultimate state, the safety factor of foundation stability is obtained; then, the corresponding safety factor allowed value is obtained through the target reliability index; and finally, the universality verification of the safety factor allowed value is conducted. The discrimination method solves the problem that because in an existing foundation bearing capacity safety judgment process, the parameter excessively depends on engineering experience, the safety judgment is one-sided and not accurate, steps are simple, and the discrimination method has good practical value on the aspect of the engineering foundation safety stability.
Description
technical field [0001] The invention belongs to the technical field of engineering foundation stability, and in particular relates to a method for judging the safety of foundation bearing capacity. Background technique [0002] The bearing capacity of the foundation is the bearing potential of the unit area of the foundation soil as the load increases. The commonly used unit is Kpa, which is a comprehensive term for evaluating the stability of the foundation. In the current actual engineering, the safety analysis of foundation bearing capacity is very important to the safety of the whole project. In most engineering practices, the safety and stability analysis of foundation bearing capacity adopts the bearing capacity safety factor method, that is, through the ultimate bearing capacity q of the foundation f Divide by the actual bearing capacity q of the foundation to obtain the safety factor F, and then conduct safety judgment, specifically expressed as follows: [0003]...
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IPC IPC(8): E02D1/00
CPCE02D1/00
Inventor 李炎隆佘磊刘云贺杨杰许增光程琳陈波
Owner 广东保顺检测鉴定有限公司