八宝山断层的变形行为与降雨及地下水的关系

利用北京丰台大灰厂观测台站1970——2003年的长期综合观测资料，系统分析了降雨和地下水对北京八宝山断层变形行为的影响. 研究结果表明:当降雨量持续稳定周期性变化，则断层孔隙压也呈稳定周期性变化，断层变形行为也表现出明显的规则周期性变化；当降雨量明显偏低或偏离正常周期性变化，则断层孔隙压周期性消失，断层的变形行为方式也发生改变. 降雨通过改变断层带孔隙压力的变化而影响着八宝山断层的变形行为. 结合该断层已有研究结果，认为降雨和地下水有可能通过改变断层变形行为方式而影响着区域构造应力/应变场的调整. 这一结果将对研究地球浅部流体与固体相互作用提供直接的观测证据. 

THE CORRELATION OF DEFORMATION BEHAVIOR WITH PRECIPITATION AND GROUNDWATER OF THE BABAOSHAN FAULT IN BEIJING

We discuss the influence of precipitation and groundwater on the deformation behavior of the Babaoshan fault of Beijing by using long-term observation data from Dahuichang station during 1970-2003. The results show that (1) the pore pressure on fault zone as well as the fault deformation behavior exhibit periodically variation as precipitation changed steadily and periodically; (2) the periodicity of the pore pressure of fault zones disappeared and the manner of fault deformation behavior changes when precipitation was small and/or was in aberrance. This implies that rainfall plays a key role in fault deformation behavior through changing the pore pressure of fault zones. Combining the existing results about the Babaoshan fault, it is concluded that precipitation and groundwater may adjust the stress/strain field by controlling the deformation behavior of the fault, which can provide direct observation evidence for the interaction of fluid and solid in shallow crust of the earth.