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A method for simulating progressive failure, like solid-liquid phase transformation behavior of rock and soil media

A progressive failure, rock-soil medium technology, applied in the fields of particle rheology, earthquake prevention and disaster reduction, and computational soil mechanics, can solve the problems of complex catastrophe evolution process and lack of research

Inactive Publication Date: 2019-01-29
TONGJI UNIV
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Problems solved by technology

The change process of slope rock and soil materials from limited deformation to extremely large deformation involves the transformation of physical state from solid-like to liquid-like. The catastrophe evolution process is complicated, and there is a lack of relevant research in the world

Method used

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  • A method for simulating progressive failure, like solid-liquid phase transformation behavior of rock and soil media
  • A method for simulating progressive failure, like solid-liquid phase transformation behavior of rock and soil media
  • A method for simulating progressive failure, like solid-liquid phase transformation behavior of rock and soil media

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Embodiment 1

[0089] Taking the Tangjiashan Landslide Triggered by the Wenchuan Earthquake as an Example

[0090] Before the earthquake, the slope size of Tangjiashan was as follows figure 1 As shown, the slope is about 39°. After a long period of geological weathering, the slope is divided into strong weathered rock and weak weathered rock. On May 12, 2008, Tangjiashan was destabilized and destroyed by the Wenchuan Earthquake. The landslide material (mainly strongly weathered rock) disintegrated and moved along the terrain at a relatively high speed, forming a large volume of debris flow , killing 84 people.

[0091] The numerical simulation method of the present invention is used to simulate the whole process disasters of Tangjiashan landslide start-up and avalanche triggered by the Wenchuan earthquake. The specific process is as follows:

[0092] 1) Before the Wenchuan Earthquake, the Tangjiashan slope study area was selected as a horizontal distance of 1712 meters and a height of 872...

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Abstract

The invention relates to a rock-soil medium progressive failure, solid-like. The smooth particle dynamics (SPH) method is improved from three aspects: boundary condition, constitutive relation and artificial stress, so that the SPH can reproduce the progressive failure of rock and soil media under strong earthquake dynamic condition, solid-like-liquid phase change behavior, constructing slip-freeboundary modified by seismic wave velocity to apply seismic wave, creating free-field boundary to prevent seismic wave reflection, using particle rheology for reference, combining Drucker-Prager constitutive model and Newtonian fluid constitutive model construct a new unified constitutive model, which can describe the phase from sliding (solid-like) to flowing (liquid-like) in geotechnical media.The invention effectively reproduces the kinematic characteristics of the start-up, high-speed flow and accumulation process of the landslide, analyzes the progressive failure of the rock and soil medium and the penetration process of the sliding surface under the action of the strong earthquake, thereby accurately predicting the sliding distance, and reasonably assesses the earthquake-triggered landslide. The hazard caused by debris flow provides scientific basis for the planning and design of earthquake prevention and disaster reduction.

Description

technical field [0001] The invention relates to the technical fields of computational soil mechanics, particle rheology and earthquake prevention and disaster reduction, in particular to a simulation method for progressive damage of rock-soil medium and solid-liquid phase transition behavior triggered by strong earthquakes. Background technique [0002] Large-scale landslides triggered by strong earthquakes often have a staged form: the limited deformation stage before the high-speed start of the landslide, and the extreme deformation stage after the instability and failure (the magnitude of the strain amplitude is used as a parameter). In the state of limited deformation, the rock-soil medium behaves as a solid mechanical property and will begin to enter the stage of large deformation. In the state of extreme deformation, the rock-soil medium viscous flow occurs, and it is in a mechanical state of large deformation, which has constitutive behavior characteristics different ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20G06F2111/10G06F2119/06
Inventor 黄雨包扬娟
Owner TONGJI UNIV
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