钻孔应变差应变耦合系数反演与有关机理的探讨

COUPLING COEFFICIENTS INVERSION OF DIFFERENCE STRAIN IN BOREHOLE OBSERVATION AND DISCUSSION OF RELATED MECHANISM

研究反演分量式钻孔应变差应变耦合系数的方法,采用考虑方位角校正和相位滞后影响两种计算模型,计算结果显示大多数测站采用两种方法反演的耦合系数均比较相近,相位滞后、方位角校正以及拟合残差的结果相对稳定;但是有部分测站的差应变相位滞后偏离较大,从而导致采用两种方法反演的耦合系数差异较大。结合测站周边的构造分布,对可能导致该现象的物理机制进行了探讨。

The method of coupling coefficients inversion for 4-component borehole strainmeters was studied, which adopts two computation models including azimuth correction and phase lag effect. Using the data from the network of 4-component borehole strain observation during the Tenth Five-Year Project of China, the calculation re- suits show that coupling coefficients inverted with the two models are close to each other in most sites, and the re- suits of phase lag, azimuth correction and simulation residual are relatively stable. However, some sites＇ results of phase lag are different obviously, which results in great difference between coupling coefficients inverted with the two models. On the basis of faults distribution of sites＇ surroundings, the physical mechanisms that possibly lead to the difference are discussed.