Inverse analysis of the initial geostress field of rock masses under high geo-temperature and high geostress

被引：0
|
作者：
Meng W. [1 ]
He C. [1 ]
Zhang J. [1 ]
Zhou Z. [1 ]
Wang B. [1 ]
机构：
[1] Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, Sichuan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷 / 04期
基金：
国家重点研发计划;
关键词：
High geo-temperature; High geostress; Initial geostress field; Inversion; Rock mass; Rock mechanics;
D O I：
10.13722/j.cnki.jrme.2019.0818
中图分类号：
学科分类号：
摘要：
At present,under the environment of high geo-temperature and high geostress,it is not reported that geo-temperature is considered during geostress inversion,which causes that the initial geostress field obtained by inversion is not consistent with the actual geostress field of rock masses. In order to overcome the shortcoming,a workflow of inversion for the initial geostress field of rock masses considering geo-temperature is proposed. Under the environment of high geo-temperature and high geo-stress,the initial geostress field of rock masses can be approximately composed of gravitational,tectonic and thermal stress fields. The thermal stress field of rock masses can be approximately obtained by the geothermal gradient method and the thermal-stress formula of rock masses. Superposing the thermal stress field of rock masses into the gravitational and tectonic stress fields of rock masses can obtain the initial geostress field consistent reflecting the impact of high geo-temperature. Due to that the vertical stress is calculated by the density of overlying strata without considering the thermal stress,inverting the initial geostress field of rock masses based on the stresses measured by hydraulic fracturing will cause serious errors under the environment of high geo-temperature and high geostress. At the area of the Sangzhuling tunnel,for example,the thermal stress is about 8/13 of the gravitational stress. Comparisons between the inversion results and the measuring data of Sangzhuling tunnel show that the inversion results considering geo-temperature are better than those without considering geo-temperature. © 2020, Science Press. All right reserved.
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页码：749 / 760
页数：11
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