考虑温度影响的高庙子膨润土强度与变形特性试验研究

doi:10.13722/j.cnki.jrme.2017.0772

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Abstract In order to study the deformation and strength characteristics of GMZ bentonite under high temperature and high pressure，undrained triaxial shearing tests were conducted to 81specimens with the high-pressure triaxial apparatus with temperature control. The influences of dry density，confining pressure，temperature and water content on deformation and strength characteristics of GMZ bentonite were investigated. The results show that the failure forms of GMZ bentonite were significantly influenced by confining pressure and dry density. The specimens tested under unconfined conditions were all in brittle failure. The specimens with low dry density under high confining pressure exhibited largely the plastic failure，while those with high dry density exhibited brittle failure. The strength of GMZ bentonite specimens decreases with the increasing of water content. The influence of temperature and dry density on strength is complex. The position of deviator stress-axial strain curves rises with the increasing of temperature for specimens with low dry density，but it behave oppositely for specimens with high dry density. The initial Young’s modulus of the specimen with low dry density also rises with the increasing of temperature，but it?s opposite for specimens with high dry density. The initial Young’s modulus of specimens generally decreases with the increasing of water content. Poisson?s ratio gradually decreases with the increasing of confining pressure for specimens with low dry density，but this tendency is not obvious for specimens with high dry density. Poisson?s ratio is less influenced by temperature and water content. The formulae of cohesion and internal friction angle changing with dry density，water content and temperature were established for GMZ bentonite specimens.

Key words： soil mechanics GMZ bentonite high-temperature and high-pressure triaxial apparatus deformation and strength characteristics strength parameter deformation parameter

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	CHEN Hao1
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	LV Haibo3
	CHEN Zhenghan4
	QIN Bing4

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CHEN Hao1,2,3, et al. Strength and volume change of buffer material under high temperature and pressure[J]. , 2018, 37(8): 1962-1979.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0772 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I8/1962

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