广西盆地东北部的地应力分布特征

发布时间：2018-05-11 23:16

本文选题：地质力学 + 广西盆地　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：贵广高铁广西段位于广西盆地东北部,是连接"一带一路"的高速通道,为查明研究区的地应力分布特征,为隧道的设计提供基础资料,在广西5个不同地区开展了8个钻孔的水压致裂地应力测量工作,结果表明:研究区内最大水平主应力S_H方向主要表现为NNW-NWW,这与华南区域应力场相一致;S_H和最小水平主应力S_h的梯度小于全国平均地应力梯度。在深度小于300 m的范围内,三向主应力相对大小以S_HS_hS_v为主,在这种应力状态下有利于逆断层的活动;在深度大于300 m的范围内,三向主应力相对大小以S_HS_vS_h为主,在这种应力状态下有利于走滑断层的活动,这种应力状态与研究区以逆断兼走滑的断层结果较为一致。研究区侧压力系数的值和μ_m值(最大剪应力与平均主应之比)均表明测区内断层处于稳定状态,这与研究区属于构造稳定区的研究结果相一致。
[Abstract]:The Guangxi section of Gui-Guang high-speed railway is located in the northeast of Guangxi Basin. It is a high-speed passage connecting "Belt and Road". It can provide basic data for the design of tunnels and to find out the characteristics of in-situ stress distribution in the study area. In five different regions of Guangxi, the in-situ stress measurement of hydraulic fracturing of 8 boreholes has been carried out. The results show that the maximum horizontal principal stress Sh direction is mainly NNW-NWW-NNW, which is consistent with the regional stress field in South China. The gradient of SSP H and the minimum horizontal principal stress Sh is smaller than that of the national average in-situ stress gradient. In the range of depth less than 300m, the relative magnitude of the three-way principal stress is S_HS_hS_v, which is favorable to the activity of the reverse fault in this stress state, and the relative magnitude of the three-way principal stress is S_HS_vS_h when the depth is larger than 300m. This state of stress is favorable to the activity of strike-slip faults, which is consistent with the results of the faults with reverse fault and strike-slip in the study area. The values of the lateral pressure coefficient and 渭 M (the ratio of the maximum shear stress to the mean principal response) indicate that the faults in the measured area are in a stable state, which is consistent with the results of the study on the structural stability in the study area.
【作者单位】：中国地震局地壳应力研究所;中国地震局地壳动力学重点实验室;中国科学技术大学地球和空间科学学院;中国地质科学院水文地质环境地质研究所;中国建筑科学研究院;
【基金】：国家自然科学基金资助项目(41404036,41574081) 中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项资助项目(ZDJ2016 10)~~
【分类号】：P642

【相似文献】