【摘要】 基于地震断层弹性位错理论,采用地震位移水平分布的抛物线模型,研究了三维有限元方法在活断层发震产生地震变形预测计算中的应用,并以敦煌莫高窟为例进行了实际计算。研究及计算结果表明,该方法计算地震变形简明实用,具有计算精度高、边界可控、模型可调的特点,能使模拟更切合实际。更多还原

【Abstract】 D finite element method is employed in the prediction and calculation of seismic deformation with the parabola model of horizontal displacement distribution,and the seismic deformation of Mogao Grottoes in Dunhuang as a case study. The results show that 3D finite element method is of high precision,being able to control boundary conditions and adjust computation models. The calculated displacements and strains on the ground surface agree,in order of magnitude,with the actual values observed in earthquake. The influence of fault dimension on the result is also studied,which indicates that the calculated value is stable when fault depth is greater than a certain value,and the reliable earthquake deformation with 3D finite element method can be achieved.更多还原