张田田,杨为民,孟华君. 区域性节理控制的反倾岩质斜坡水力劈裂破坏机制—以北京“8·11”大安山岩质崩塌为例[J]. 华北地震科学,2020, 38(1):1-7. doi:10.3969/j.issn.1003−1375.2020.01.001.
引用本文: 张田田,杨为民,孟华君. 区域性节理控制的反倾岩质斜坡水力劈裂破坏机制—以北京“8·11”大安山岩质崩塌为例[J]. 华北地震科学,2020, 38(1):1-7. doi:10.3969/j.issn.1003−1375.2020.01.001.
ZHANG Tiantian,YANG Weimin,MENG Huajun. Hydraulic Joint Splitting Failure Mechanism of Anti-dip Rock Slope Controlled by Regional Joints—Taking the “8·11” Da’anshan Rock Collapse in Beijing As An Example[J]. North China Earthqauke Sciences,2020, 38(1):1-7. doi:10.3969/j.issn.1003−1375.2020.01.001.
Citation: ZHANG Tiantian,YANG Weimin,MENG Huajun. Hydraulic Joint Splitting Failure Mechanism of Anti-dip Rock Slope Controlled by Regional Joints—Taking the “8·11” Da’anshan Rock Collapse in Beijing As An Example[J]. North China Earthqauke Sciences,2020, 38(1):1-7. doi:10.3969/j.issn.1003−1375.2020.01.001.

区域性节理控制的反倾岩质斜坡水力劈裂破坏机制—以北京“8·11”大安山岩质崩塌为例

Hydraulic Joint Splitting Failure Mechanism of Anti-dip Rock Slope Controlled by Regional Joints—Taking the “8·11” Da’anshan Rock Collapse in Beijing As An Example

  • 摘要: 以2018年“8·11”大安山反倾岩质崩塌为研究对象,通过对大安山地区区域性节理、崩塌及斜坡结构、危岩体变形特征等进行调查研究,运用水力劈裂理论,剖析大安山崩塌机制。研究结果表明:在区域性节理和差异性风化共同作用下,大安山地区发育大量高20~50 m高陡反倾岩质斜坡,为崩塌灾害发生提供充分条件;同时,节理裂隙网络与强硬岩层的空间组合为降雨入渗、运移、储藏提供了良好的地质条件,当遭遇降雨时,雨水沿岩体裂隙渗流并充满裂隙,在降雨停止后短期内,裂隙受高水头作用仍发生水力劈裂,致使裂隙发生扩展贯通,并最终导致危岩体失稳崩塌。

     

    Abstract: In this paper, the “8·11” Da'anshan anti-dip rock collapse is taken as the research object. Through the investigation of regional joints, collapses, slope structure characteristics and dangerous rock mass deformation characteristics in Da'anshan area, the hydraulic splitting theory is used to analyze Da’anshan collapse mechanism. The results show that under the joint action of regional joints and differential weathering, a large number of high-steep 20~50 meter high anti-dip rock slopes are developed in the Da'anshan area, which provides favorable conditions for the occurrence of collapse disasters. Meanwhile, the spatial combination of the joint fracture network and the hard rock formation provides good geological conditions for rainfall infiltration, migration and storage. When encountering rainfall, the rainwater seeps along the rock mass and is filled with fissures. In the short-term after the rain stops, the cracks are still hydraulically split by the high water head, cause the cracks to expand and penetrate, and eventually lead to the instability and collapse of the dangerous rock mass.

     

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