Multi-regression Analysis of In-situ Stress Field in Deep River Valley
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摘要: 针对深切河谷地区独特的地形条件,从影响地应力的因素入手,提出除自重、地质构造外,河谷的剥蚀下切和谷坡形态的发育、演化也是影响地应力场的重要因素.将初始地应力场视为由谷坡下切改造后的自重应力场和构造应力场组成,采用回归分析的方法确定河谷地区的地应力场.计算结果表明,考虑河谷的发育和演化史,分步模拟谷坡剥蚀下切得到的岩体应力状态与实测数据更为接近,呈现出谷坡浅表部应力松弛卸荷和谷底应力集中的分布规律.Abstract: Based on the geological characteristics of deep river valleys,factors inflencing in-situ stress fields were analyzed.It was strongly believed that valley development is an important factor affecting in-situ stress fields besides self-weight and geological structures.An in-situ stress field was simulated by the multi-regression method and thought to be the sum of a self-weight stress field affected by river valley development and a tectonic stress field.The research result shows that the regressed stresses considering the development and evolution of a deep river valley by steps are close to the measured ones,and the regressed stress field characterizes a relaxation at the shallow surface of a deep river valley and a concentration at its bottom.
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Key words:
- deep river valley /
- in-situ stress /
- multi-regression method
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