水–岩作用下红层软岩力学特性劣化规律研究

doi:10.13722/j.cnki.jrme.2016.0810

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Abstract Red-layer soft rock is widely distributed in the Three Gorges Reservoir area. The deterioration of physical and mechanical characteristics of red-layer soft rock，caused by water-rock interaction，will directly affect the long-term deformation stability and safety for the slopes of reservoirs concerned. Therefore，considering the fact that the water level of hydro-fluctuation belt is rising up and down repeatedly，the immersion-air dry test for red-layer soft rock is designed and conducted. The results show that：(1) Under water-rock interaction，it is obvious that the strength and deformation parameters of the red-layer soft rock are deteriorating，and the rock samples tend to be soft gradually. At the meanwhile，the first 3 tests have a faster deterioration rate for the parameters，but the rate tends to be slowdown after 5 immersion-air dry circulations；(2) As the number of circulation times increased，the failure modes of the rock samples would also be changed obviously，its shear failure features with different confining pressure would be behaved obviously，and the number of controlled cracks would be decreased gradually while the secondary cracks would be increased；(3) Under water-rock interaction，the repeated change of water pressure and the immersion-air dry circulation would impose irreversible cumulative damage to red-layer soft rock，which would convert to loose and porous structure with micro cracks and developing pores from relatively compact structure. In macroscopic view，it would behave as the deterioration of compressive strength and shear strength，and the change of failure modes. Related research results can provide references for the study of the long-term deformation stability and safety for the slopes of reservoirs.

Key words： rock mechanics red-layer soft rock hydro-fluctuation belt immersion-air dry circulation deterioration failure feature micro-structure

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	Articles by authors
	DENG Huafeng
	ZHOU Meiling
	LI Jianlin
	FANG Jingcheng
	XIAO Yao
	ZHANG Hengbin
	WANG Chenxiejie

Cite this article:

DENG Huafeng,ZHOU Meiling,LI Jianlin, et al. Mechanical properties deteriorating change rule research of red-layer soft rock under water-rock interaction[J]. , 2016, 35(S2): 3481-3491.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0810 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3481

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