摘要:
通过对水压致裂法形成的钻孔印模分析,运用Taylor公式和最小二乘法迭代算法,计算纵向和横向裂隙岩体地应力大小及其误差。首先确定大地、裂隙和钻孔坐标系,根据印模曲线确定裂隙方位;然后用Taylor公式和最小二乘法迭代算法,计算应力分量;最后计算出主应力大小及其误差。将此方法应用于雪峰山隧址区ZK6钻孔的地应力场计算,得出其最大水平应力为13 MPa,方位113°左右,这与地质构造法实测的应力场相吻合,说明这一方法合理可行,具有较好的实用价值。
Abstract:
Based on moulage analysis of bore-hole formed by hydro-fracturing,a method of account and error reliability analysis on longitudinal and transverse fracture rock-mass is proposed with Taylor expressions and iterative least-squares fitting.First,the bore-hole,fracture plane and earth coordinate system are confirmed,and cranny azimuth is confirmed by moulage curve.Then,stress component are calculated with Taylor expressions and iterative least-squaress fitting.Lastly,principle stress and its error are done.According to calculative method and geodesic datum,the maximal horizontal stress(13 MPa,113°or so) at Boreoll ZK6, Xuefeng Moutain,is educed.The result is similar to that of geologic reconnaissance and illuminates that the method is logical and applicable.
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