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Method for measuring rainfall parameter weakened foundation pit slope instability critical water content

A technology of critical moisture content and determination method, which is applied in the field of determination of critical moisture content for instability of foundation pit slopes with weakened rainfall parameters, can solve the problem of not revealing the formation mechanism and mechanical dynamics of foundation pit slope deformation and instability. Unreasonable pit slope and other problems

Inactive Publication Date: 2020-11-03
河南省第二建设集团有限公司
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Problems solved by technology

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a method for measuring the critical moisture content of the foundation pit slope with weakened rainfall parameters, which solves the problem that the existing foundation pit slope prediction and evaluation methods cannot reveal the cause of the foundation pit slope. The formation mechanism and mechanical dynamics of slope deformation and instability, it is unreasonable to use a unified deformation control value to judge whether the foundation pit slope is unstable

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  • Method for measuring rainfall parameter weakened foundation pit slope instability critical water content
  • Method for measuring rainfall parameter weakened foundation pit slope instability critical water content
  • Method for measuring rainfall parameter weakened foundation pit slope instability critical water content

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Embodiment 1

[0069] Embodiment one: by Figure 1 to Figure 3 give;

[0070] Step 1. Determine the basic physical and mechanical parameters of the foundation pit slope:

[0071] According to "Engineering Rock Mass Test Method Standard" and "Geotechnical Test Regulations", carry out systematic geophysical prospecting, testing, survey and mapping of the foundation pit slope to be measured, determine the variation law of the vertical depth and inclination angle of the foundation pit slope, and according to According to the law of inclination, the slope body of the foundation pit is divided vertically with equal width, and the inclination angle of the foundation pit is recorded as θ i , the average height of the i-th soil bar is denoted as l i , see Table 1.

[0072] Table 1 List of basic physical and mechanical parameters of foundation pit slope

[0073] Soil Strip Parameters 1 2 3 4 X i

4 4 4 4 l i

12.5 10.4 8.6 4.1 θ i

60° 60° 60° 60° ...

Embodiment 2

[0142] Embodiment two: by Figure 4 to Figure 7 gives:

[0143] Rainfall infiltration is a process in which the water content inside the slope gradually increases (that is, the movement process from unsaturated to saturated), and the infiltration characteristics of the water content inside the slope are different in different rainfall stages: as the rainfall continues in the initial stage of rainfall, the slope The water content and gravity gradually increase, and the surface of the slope first forms a plastic zone and gradually extends to the slope foot; in the middle of the rainfall, the surface layer of the slope foot first reaches saturation, and at the same time, the rock and soil on the surface of the slope are softened by the rainwater. The plastic zone further accelerates upward and inward along the slope; in the later period of rainfall, the surface rock and soil mass tends to be saturated, and the rainfall infiltration depth further expands, resulting in a decrease i...

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Abstract

The invention relates to the technical field of foundation pit slope instability early warning, in particular to a method for measuring instability critical water content of a rainfall parameter weakened foundation pit slope. A unified deformation control value is adopted to judge whether a foundation pit slope is unstable or not and judge the rainfall parameter weakening foundation pit slope instability critical moisture content. The method comprises the steps of step I, measuring basic physical mechanics parameters of a foundation pit slope; step II, determining weakening rules of cohesive force and internal friction angles of the foundation pit slope under different water content conditions; step III, arranging and mounting foundation pit displacement and slope water content monitoringequipment under rainfall conditions; step IV, determining water content power unloading parameters under different water content conditions; and step V, determining water content dynamic unloading anddisplacement coupling evaluation parameters of the foundation pit slope; and step VI, determining a foundation pit slope instability critical water content criterion, and judging the state of the foundation pit slope by adopting a plurality of variables, so that the purpose of timely and effective early warning is achieved. The method has a good development prospect in the technical field of foundation pit slope instability early warning.

Description

technical field [0001] The invention relates to the technical field of early warning of foundation pit slope instability, in particular to a method for measuring the critical moisture content of foundation pit slope instability with weakened rainfall parameters. Background technique [0002] The foundation pit engineering has the characteristics of large deformation, strong suddenness, serious hazards, and many instability factors, which account for a considerable proportion of engineering construction accidents. During the construction process of deep foundation pit engineering, due to the complex construction environment, Even for permanent foundation pits that have been excavated, accidents of foundation pit slope instability often occur under the action of rainfall. [0003] Therefore, after the excavation of the foundation pit is completed, it is also necessary to monitor the water content of the slope and the weakening of related physical parameters during the rainfall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D33/00
CPCE02D33/00E02D2600/10
Inventor 张兰阁苏群山董新红吴远超张岚贾向军都宏全祝孝成王渊曾良王龙飞
Owner 河南省第二建设集团有限公司