A Method for Calculating Matrix Suction of Homogeneous Foundation under Back Peak Rainwater Infiltration

A matrix suction and foundation technology, applied in the field of calculation of unsaturated foundation matrix suction, can solve problems that cannot be solved by matrix suction, and achieve the effect of simple calculation process

Active Publication Date: 2021-06-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The existing analytical results of soil matrix suction under rainwater infiltration cannot be used to solve the matrix suction under peak rainwater infiltration after the surface of this type of foundation encounters.

Method used

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  • A Method for Calculating Matrix Suction of Homogeneous Foundation under Back Peak Rainwater Infiltration
  • A Method for Calculating Matrix Suction of Homogeneous Foundation under Back Peak Rainwater Infiltration
  • A Method for Calculating Matrix Suction of Homogeneous Foundation under Back Peak Rainwater Infiltration

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Embodiment 1

[0033] The calculation model of the present invention is as figure 2 shown. Based on the unsaturated seepage governing equation, the analytical solution of the transient unsaturated permeability coefficient and matrix suction of the homogeneous foundation with groundwater in the deep and peak rainwater infiltration after encountering the surface is obtained through Laplace transform. The magnitude of matrix suction provides a convenient and quick calculation method, and the steps of the method are as follows.

[0034] (1) Determine the initial matrix suction distribution state of the foundation: for a homogeneous foundation with groundwater in the deep, A The matrix suction distribution corresponding to the stable seepage field formed by infiltration is taken as the initial state of the foundation, and the corresponding matrix suction calculation formula is:

[0035]

[0036] Where: h m,0 is the initial matric suction at z, in cm; β is the desaturation coefficient, in c...

Embodiment 2

[0052] The following engineering case is used to further illustrate a method for calculating the suction force of the homogeneous foundation matrix under the post-peak rainwater infiltration effect announced by the present invention:

[0053] For an unsaturated homogeneous foundation, the distance l between the groundwater level and the surface is 5m, and the physical and mechanical parameters of the soil are as follows: saturated permeability coefficient k s is 0.36cm / h, desaturation coefficient β is 0.00165 / cm, water storage capacity (θ s -θ r ) is 0.27cm 3 / cm 3 , residual water content θ r 0.20cm 3 / cm 3 . There was no rainfall in the previous period, and the rain intensity in the previous period was q A 0cm / h; later encountered heavy rain with a total rainfall of 48mm, and the rainfall lasted for 12h. In the later stage of rainfall, the rain intensity variation coefficient a was 0.05cm / h 2 , the initial rain intensity q 0 It is 0.1cm / h.

[0054] Based on the abo...

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Abstract

The invention discloses a method for calculating the matric suction of a homogeneous foundation under the action of post-peak rainwater infiltration, comprising the following steps: determining the distribution state of the initial matric suction of the homogeneous foundation; calculating the transient unsaturated state of the foundation in the process of post-peak rainwater infiltration Permeability coefficient; calculation of foundation matric suction in post-peak rainwater infiltration process. Based on the unsaturated seepage control equation, the present invention obtains the analytic solution of the unsaturated permeability coefficient and matrix suction of the homogeneous foundation with underground water in the deep part and peak rainwater infiltration after the surface encounters it through the Laplace transform, and provides a method for quickly obtaining the foundation The magnitude of matrix suction provides a convenient and quick calculation method. The invention can visually reveal the non-linear evolution characteristics of foundation matrix suction with rainfall duration in the post-peak rainwater infiltration process, and provide technical support for the evaluation of the unsaturated mechanical properties of the foundation in the rainy season and the disaster prevention and mitigation of the foundation.

Description

technical field [0001] The invention belongs to the technical field of calculation methods for unsaturated foundation matrix suction, in particular to a method for calculating homogeneous foundation matrix suction under the action of post-peak rainwater infiltration. Background technique [0002] Matric suction is an important index to describe the mechanical properties of unsaturated foundation, which directly affects the bearing performance of unsaturated foundation. Rainwater infiltration is one of the main factors affecting the change of subgrade matric suction. Therefore, it has been a hot research issue to obtain the evolution characteristics of subgrade matric suction under the action of rainwater infiltration accurately and conveniently. [0003] At present, numerical simulation or on-site in-situ monitoring are mainly used to obtain soil matric suction under the action of rainwater infiltration. The analysis process of this method is often complicated, time-consumin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 秦卫星胡惠仁廖紫欣陈志豪邓思佳
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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