A calculation method for the ultimate bearing capacity of homogeneous foundation under constant rainfall infiltration
A technology of ultimate bearing capacity and calculation method, which is applied in basic structure engineering, on-site foundation soil survey, construction, etc., to achieve a simple and intuitive calculation process
Active Publication Date: 2020-09-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0006] Aiming at the existing technical problems in solving the ultimate bearing capacity of homogeneous foundations under the action of rainfall infiltration, the present invention provides a convenient and fast equal rain method based on the Richards transient unsaturated seepage control equation and the calculation theory of the ultimate bearing capacity of unsaturated foundations. Calculation method of ultimate bearing capacity of homogeneous foundation at any time during strong infiltration
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Embodiment 1
[0066] Taking a homogeneous foundation as the research object, the calculation diagram is as follows figure 2 As shown, the bar base width b ,long f They are 1m and 10m respectively, and the base is completely rough. For the convenience of analysis, the foundation is buried deep d Take it as 0m. surface to groundwater l is 5m. According to the local rainfall data, select a rainfall event with no rainfall in the early stage, continuous rainfall for 30 days in the late stage, and a total rainfall of 216 cm, then q A =0.0cm / h, q B =0.3cm / h. Soil parameters: effective cohesion c´ =18kPa, effective internal friction angle φ´ =16°, saturated permeability coefficient k s =0.36cm / h, air intake value ( u a -u w ) a =26.32kPa. Measured soil volume moisture content θ and matrix suction ( u a -u w ) between the relationship, such as image 3 shown, and the Gardner soil-water characteristic curve model is used to describe the unsaturated permeability coefficient ...
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The invention discloses a method for calculating ultimate homogeneous foundation bearing capacity under the equal raininess infiltration effect. The method includes the steps that an initial foundation matric suction distribution state is determined; a foundation matric suction transient distribution state in the process of equal raininess infiltration is determined; the size of average substratematric suction in the process of rainfall infiltration is calculated; and the size of the foundation bearing capacity in the process of rainfall infiltration is calculated. According to the method, matrix suction nonlinear analytical during equal raininess infiltration is given to calculate foundation matrix suction, based on the calculation theory of unsaturated foundation ultimate bearing capacity, an analytical expression of the ultimate bearing capacity during rainfall is obtained, and the direct mapping relationship among uniform foundation ultimate bearing capacity, rainfall intensity and rainfall duration is established. According to the method for calculating the ultimate homogeneous foundation bearing capacity under the equal raininess infiltration effect, contribution of nolineardistribution matrix suction to the ultimate bearing capacity during equal raininess infiltration is considered, foundation ultimate bearing capacity at any time during rainfall infiltration can be predicted rapidly, and theoretical and technical support is provided for foundation bearing performance evaluation during the rainy season and foundation disaster prevention and reduction.
Description
technical field [0001] The invention belongs to the technical field of calculating the ultimate bearing capacity of unsaturated foundations, in particular to a method for calculating the ultimate bearing capacity of homogeneous foundations under the infiltration of equal rain intensity. Background technique [0002] Matric suction has an enhanced effect on the bearing performance of unsaturated foundations. Reasonable consideration of the contribution of matric suction can effectively tap the bearing potential of unsaturated foundations and ensure safe and economical engineering design. However, rainfall infiltration can easily lead to the reduction or even disappearance of the suction force of the soil matrix in the middle and upper parts of the foundation, thereby reducing the bearing capacity of the foundation and adversely affecting the safety of the project. Therefore, revealing the evolution characteristics of the ultimate bearing capacity of the foundation under the a...
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IPC IPC(8): E02D1/08
Inventor 秦卫星胡惠仁邓思佳陈志豪廖紫欣
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY