基于界面力学的岩溶地面塌陷机理研究

Karst Collapse Simulation by Using Interface Mechanics

基于界面力学理论,用有限元软件对含土洞三元土层结构的岩溶塌陷进行数值模拟,发现界面的存在对岩土体结构的变形有较大的影响,各岩土层的应力在界面与土洞周围存在应力集中、应力不连续现象,结构的破坏是从下层软土与岩石交界面开始的,与桂兴村塌陷的实际相符。为岩溶区地面塌陷的调查与评价提供了一些新的参考。

The interface mechanics theory was used in the numerical simulation of the process of karst rock cavern collapse in the soil,rock and void system.It is concluded that the interface had a significant influence on the subsidence in the karst geotechnical materials.A stress concentration and the stress discontinuity are encountered at the interface between the soil cavity and the void.And the progressive failure was initiated at the interface of soft soil-rock.These numerical analysis results are consistent with a collapse encountered in the Guixng Development.