向家坝水电站含弱面砂岩剪切蠕变试验研究

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Abstract The compressive zone was revealed in the excavation of left bank dam foundation of Xiangjiaba Hydropower Station. The quality of sandstone in the zone is poor，and its significant creep deformation is harmful to hydraulic structures. Shear creep experiments were carried out for the sandstone with weak plane by using CSS–3940YJ rock shear rheology testing machine. The results show that large creep deformation of the sandstone occurs in the experiment. Before the damage，the shear strain reaches 1.73%–8.05%. The rock is of significant ductility characteristics，and it is typical soft rock. The normal stress enhances the ductility of rock. At a constant normal stress，the creep rate of the rock increases with the increase in shear stress level. Based on large amounts of experimental data，the creep rates at every moment are calculated by difference methods，and the power function is used to fit the rate curve. The analysis shows that the time required for creep stability of rock increases with increase in shear stress level. It is found through the analysis of the fracture that the internal microcracks of rock expand with the increase in shear stress level and time until coalescence resulting in shear failure of the rock. The achievements offer important referential value for the research on dam foundation of Xiangjiaba Hydropower Station.

Key words： rock mechanics sandstone with weak plane shear creep normal stress creep rate rupture mechanism

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	Articles by authors
	ZHANG Zhiliang1
	2
	XU Weiya1
	2
	ZHAO Haibin3
	JIAN Bo3

Cite this article:

ZHANG Zhiliang1,2,XU Weiya1, et al. INVESTIGATION ON SHEAR CREEP EXPERIMENTS OF SANDSTONE WITH WEAK PLANE IN XIANGJIABA HYDROPOWER STATION[J]. , 2010, 29(S2): 3693-3698.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3693

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