花岗岩低温强度参数与冰胀力的关系研究

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Abstract The strength parameters of rock under low temperature have a certain relationship with the ice expansion force. Based on thermodynamic properties of ice，the mathematical relationship between varying low temperature and ice expansion force is created. Considering that the surrounding rocks near the underground liquefied natural gas(LNG) storage caverns lie in 0 ℃–－50 ℃ environment for a long time，the compressive strength laws of dry and saturated granite at varying low temperature are studied under different confining pressures by using the triaxial compression test results of dry and saturated frozen granite samples. According to Mohr-Coulomb criterion and generalized Mises conditions(including Drucker-Prager criterion)，the relations among the rock strength parameters，temperature and ice expansion force are established under varying low temperature conditions. The results show that：The ice expansion force of rock pore has a relationship with the mechanical parameters and the volume expansion coefficient of ice changing with low temperature；and the ice expansion force gradually decreases with reducing temperature. The internal friction angle and cohesion of frozen granite are relative to varying low temperature and ice expansion force；and their values in frozen state are always greater than those in dry conditions at the same temperature. The results and the strength conditions can be used for researching and evaluating the long-term stability of surrounding rocks of underground LNG storage caverns.

Key words： rock mechanics underground liquefied natural gas(LNG) storage strength parameters ice expansion force low temperature granite

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	LI Yunpeng1
	2
	WANG Zhiyin1
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Cite this article:

LI Yunpeng1,2,WANG Zhiyin1, et al. STUDY OF RELATIONSHIP BETWEEN STRENGTH PARAMETERS AND ICE EXPANSION FORCE OF GRANITE UNDER LOW TEMPERATURE[J]. , 2010, 29(S2): 4113-4118.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/4113

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