岩溶地区嵌岩桩稳定性影响因素的敏感性研究

Study on the Factor of Karst Area on the Sensitivity of Influences on the Stability of Embedded Rock Pile

采用ABAQUS有限元软件对嵌岩桩进行数值模拟计算.通过逐一改变溶洞高度、溶洞的跨度、溶洞的顶板厚度、桩端嵌入深度、桩径等,得出桩体最大位移和溶洞顶板受力情况,研究各因素对溶洞顶板稳定性的影响.结果显示:溶洞极限承载力对溶洞的顶板跨度、顶板厚度、岩体的完整性比较敏感;对于桩体的直径和嵌岩深度有一定的影响,但是不是太明显;对于溶洞的高度不敏感.

A serious of embedded rock pile is simulated, using the ABAQUS finite element software. To examine the effect of influencing factors on the stability of karst cave roof, the height of the karst cave, the span of karst cave, the thickness of roof, the pile embedded depth, the eccentricity of pile and the diameter of pile are modified. Experimental results show that the bearing capacity of pile foundation is sensitive to the width of karst cave, the thickness of roof and the RMR of karst cave. The embedded depth and eccentricity of pile have less effect in the bearing capacity of pile foundation. The bearing capacity of pile foundation is not sensitive to the height of karst cave.