高地温高地应力下岩体初始地应力场反演分析#br#

doi:10.13722/j.cnki.jrme.2019.0818

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Abstract 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.

Key words： rock mechanics high geo-temperature high geostress initial geostress field inversion rock mass

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	MENG Wei
	HE Chuan
	ZHANG Junbo
	ZHOU Zihan
	WANG Bo

Cite this article:

MENG Wei,HE Chuan,ZHANG Junbo, et al.

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

[J]. , 2020, 39(4): 749-760.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0818 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I4/749

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