河谷坡度对岩体地应力场影响的数值模拟

发布时间：2018-10-13 11:29

【摘要】：通过选取河谷坡高及谷宽作为引起坡度变化的主要因素,采用FLAC3D计算程序,并结合河谷发育演化史,研究了坡度变化对河谷岩体地应力的大小、方向及分布的影响。研究结果表明:1)谷底应力集中现象明显,呈现河谷区典型的"应力包"分布特征,应力集中区范围及最大主应力量值均随坡度的增加而增大;2)谷坡上方浅部属于低应力区,最大主应力值随坡度的增加而减小,而谷坡下方靠近坡脚附近的最大主应力值随坡度的增加而增大;3)主应力方向分布特征在河谷不同部位存在明显的差异,且坡度越大,差异越明显。最后,以南水北调西线工程阿达坝区为例,对坝区地应力场分布特征进行分析,进一步验证了数值模拟结果的正确性及合理性。
[Abstract]:By selecting the height and width of the valley slope as the main factors to cause the slope change, the influence of the slope change on the magnitude, direction and distribution of the rock mass stress in the valley is studied by using the FLAC3D calculation program and the evolution history of the valley. The results show that: 1) the stress concentration at the bottom of the valley is obvious, showing the typical "stress package" distribution in the valley, the range of the stress concentration zone and the maximum principal stress value increase with the increase of the slope, 2) the shallow part of the valley slope belongs to the low stress zone, The maximum principal stress value decreases with the increase of slope, and the maximum principal stress value near the foot of slope increases with the increase of slope. 3) the distribution of principal stress direction is obviously different in different parts of the valley, and the bigger the slope is, the higher the value of principal stress is. The more obvious the difference is. Finally, taking the west route of South-to-North Water transfer Project as an example, the distribution characteristics of in-situ stress field in the dam area are analyzed, which further verifies the correctness and rationality of the numerical simulation results.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;长江科学院水利部岩土力学与工程重点实验室;
【基金】：国家“973”重点基础研究发展计划资助项目(2010CB732001) 国家杰出青年基金资助项目(51025935) 国家自然科学基金面上项目(51174190)
【分类号】：TU452

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