| 泊松比对川藏铁路嘉黎断裂附近地应力场的影响 |
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| 引用本文： | 许俊闪,王建新,陈兴强,张策,张彦山,王健,丁立丰,王显军.泊松比对川藏铁路嘉黎断裂附近地应力场的影响[J].地球科学,2022,47(3):818-830. |
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| 作者姓名： | 许俊闪 王建新 陈兴强 张策 张彦山 王健 丁立丰 王显军 |
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| 作者单位： | 1.应急管理部国家自然灾害防治研究院，北京 100085 |
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| 基金项目： | 国家自然科学基金川藏铁路重大基础科学问题项目41941016国家自然科学基金项目42102266中央级公益性科研院所基本科研业务专项ZDJ2019-09 |
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| 摘 要： | 川藏铁路在波密跨越嘉黎断裂，研究其周边地应力场对认识嘉黎断裂对川藏铁路廊道地应力场的影响至关重要.通过数值模型计算了通古地区及其邻近鲁朗、多康地区地应力场，通过对比3个模型的加载条件和力学参数差异，分析了沿嘉黎断裂带地应力场与周边区域地应力场的不同.结果表明:（1）总体来看，随深度变化的泊松比，能更好地拟合实测地应力数据；（2）地应力场区域差异明显，多康地区地应力较高，挤压明显，而鲁朗地区挤压程度仅为多康地区1/3左右，通古地区跨越嘉黎断裂带，应力场显示挤压很弱，可能应力已经释放；（3）基于实测数据和合适的地质力学参数，可以较为有效地预测地壳浅层的局部应力场，而预测地壳深部应力场则需要精确的泊松比上限值.
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| 关 键 词： | 川藏铁路 地应力场 嘉黎断裂 泊松比 工程地质 |
| 收稿时间： | 2021-12-16 |
Effects of Poisson Ratio on In-Situ Stress Field near the Jiali Fault along the Sichuan-Tibet Railway |
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| Abstract: | The Sichuan-Tibet Railway crosses the Jiali fault in Bomi. Therefore, studying the in-situ stress field around the Jiali fault is very important to understanding the influence of Jiali fault on the in-situ stress field along the Sichuan-Tibet Railway corridor. In this study, the in-situ stress field of Tonggu area and its neighboring areas of Lulang and Duokang are studied via numerical models. The loading conditions and geomechanical parameters of three models are analyzed. The results show that: (1) Poisson ratio that varies with depth is more suitable for fitting the measured data of in-situ stress. (2) The in-situ stress field shows obvious regional differences. The in-situ stress in the Duokang area is relatively high, demonstrating a strong compressional state, while the compression in the Lulang area is only about 1/3 of that in the Duokang area. The field in Tonggu area shows that the compression is very weak. It means that the stress along the Jiali fault zone may have been released. (3) Based on the measured data and appropriate geomechanical parameters, the local stress field in the shallow part of the crust can be effectively predicted, whereas the accurate upper limit of Poisson's ratio is needed to predict the stress field in the deeper part. |
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