热–力作用下隧道岩爆温度效应的物理模型试验

doi:10.13722/j.cnki.jrme.2017.1035

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Abstract With the large-scale developments in west China，the high geothermal and high geostress conditions have been encountered in growing number of tunnels. To study the thermo-mechanical characteristics of rock bursts occurred around tunnels with coupled high geothermal-geostress processes，the physical model with two-dimensional geomechanical loading system was developed. Based on the researches concerning the rockbursts prone similar materials，a tunneling excavation equipment and a thermal-stress loading system was also developed in this study. Four model tests，corresponding to four temperatures fields(20 ℃，40 ℃，60 ℃，80 ℃) under high geostress and with the lateral pressure coefficient of 2.0，were carried out to obtain the strains，acoustic emission features and deformation failure characteristics of surrounding rocks. The results show that during the range of 20 ℃–80 ℃，the degree of brittleness of and the accumulated elastic strain energy in surrounding rock increase with the rising of the temperature. The tangential stress and stress difference in tunnel wall increases，which creates more favorable conditions for rock burst. The higher the temperature，the smaller the deformation of surrounding rock before failure，and the bigger the released energy，the more fracture sources. Besides，the higher the temperature，the brittle failure of surrounding rock is more intense and occurs more suddenly，and the gradual process of rockburst is less seen，the block sizes of spalling rock and burst ejection are bigger. Hence，it can be concluded that the rockbursts take place more intensely with the increase of temperature(geothermal) under the coupled thermo-mechanical processes in a certain range of temperatures.

Key words： tunnelling engineering rock bursts coupled thermo-mechanical processes physical model tests thermal effects

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	Articles by authors
	LI Tianbin1
	2
	PAN Huangsong2
	3
	CHEN Guoqing1
	2
	MENG Lubo1
	2

Cite this article:

LI Tianbin1,2,PAN Huangsong2, et al. Physical model tests on thermo-mechanical effects in rockbursts around tunnels[J]. , 2018, 37(2): 261-273.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1035 OR http://www.rockmech.org/EN/Y2018/V37/I2/261

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