【摘要】 在解决钻孔应变观测加衬模型的待定常数的基础上,巧妙地利用不变量与坐标系选择无关的性质,推导出了5组观测组合计算不变量的简洁表达式,并以玉树地震为例,选取漳州台深井观测系统的探头上、下端面8分量应变观测单元的观测资料,采用加衬模型分别根据探头上下端面的5组观测组合公式计算了地震当天的最大主应变、最小主应变、最大主应变相应的主方向、最大剪应变以及面应变与体应变分钟值,分别给出了探头上端面234观测组合在2010年玉树7.1级地震发震当天7h30m～9h30m时间窗内的上述不变量分钟值同震响应图像,最后对同震响应性质进行了分析,并对最大、最小主应变以及最大主应变相应的主方向的可靠性进行了讨论。更多还原

【Abstract】 Based on how to solve for the constants determined in a borehole strain observations lining model,this paper uses one of the invariant’s properties to derive five sets of the invariant’s expression using observation data combination.The property is that the invariant has nothing to do with the coordination system selection.Then the paper applies it to the case in Yushu earthquake by selecting better observed datum at the upper and lower surfaces of a detector in an 8-component strain observing system.Then,this paper calculates the maximum and the minimum principal strains,principal strain directions,the maximum shear strain,the maximum strain on a surface and volumetric strain at minute interval.Briefly,this paper selects the datum at 2# 3# 4# from the upper surfaces of a detector within time window 7:30 ～ 9:30 when earthquake occurred resulting in co-seismic response for strain invariants,surface-strain and bulk-strain.Finally,this paper furthermore discusses properties of these co-seismic responses,as well as reliability of the result of maximum,minimum strain,and principal directions of maximum strain given in this paper.更多还原