吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (5): 1416-1426.doi: 10.13278/j.cnki.jjuese.20170116
洪勇1, 周蓉1, 郑孝玉2
Hong Yong1, Zhou Rong1, Zheng Xiaoyu2
摘要: 为探索滑坡灾害中土在复杂条件下的剪切力学特性,本文利用大型环剪试验机,通过进行各种排水条件下的连续大位移剪切试验,对不同法向应力、剪切速率和孔隙水压力等复杂条件下饱和砂土的力学特性及其变化机理进行了研究。结果表明:1)在连续快速剪切条件下,砂土剪切力学特性在干燥、不排水和排水等条件下呈现不同的变化形式。其中在不排水条件下,饱和砂出现一定的应变软化现象。2)在相同正应力和剪切速率的环剪试验中,饱和砂在不同排水条件下(上排水、下排水、上下排水)的抗剪强度出现显著差异。3)在排水环剪试验条件下,砂土剪切应力与强度的差异性变化不仅与土体内细土颗粒运移和结构变化有关,并且受到剪切过程中不同排水条件下孔隙水压力变化的影响和控制。4)排水环剪条件下,饱和砂孔隙水压力的消散变化不仅与不同排水方式下土体内所形成的排水通道顺畅程度有关,并且受到不同剪切速率和法向应力的影响作用。
中图分类号:
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