Effects of valley topography on principal stress orientations

机译：谷底地形对主应力方向的影响

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Recent field studies conducted in a valley setting have provided direct evidence of an exchange with depth in the orientations of the two horizontal principal stresses, S_(HMAX) and S_(HMIN). This observed 90-degree rotation with depth of S_(HMAX) and S_(HMIN) beneath a valley is predicted by a previously developed analytical model for the effect of topography on near-surface tectonic and gravitational stress fields in idealized, isolated, symmetric valleys. These new modeling results demonstrate that valley topography may cause significant local perturbation of regional stress fields; effects that should be considered whenever regional stress orientations are inferred from near-surface hydraulic fracturing experiments and/or from well-bore breakout data.

机译：最近在山谷环境中进行的野外研究提供了两个水平主应力S_（HMAX）和S_（HMIN）方向上深度交换的直接证据。先前开发的解析模型预测了在理想化，孤立，对称的山谷中地形对近地表构造和重力应力场的影响，从而预测了在山谷下方观察到的深度为S_（HMAX）和S_（HMIN）的90度旋转。这些新的模拟结果表明，山谷的地形可能会引起局部应力场的局部局部扰动。从近地表水力压裂实验和/或井筒破裂数据推断出区域应力方向时，应考虑到这种影响。

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《Rock Mechanics in the National Interest》|2001年|p.1397-1400|共4页
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W.Z.Savage; R.H.Morin;
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Effects of valley topography on principal stress orientations

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