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选取级配相同的双江口土石坝、长河坝土石坝坝基覆盖层砂卵砾石料,分别进行4种不同围压下的静止土侧压力系数K_0固结排水剪切大型三轴试验,分析了K_0条件下砂卵砾石料的强度与变形特性。结果表明,K_0条件下的砂卵砾石料在低围压下表现出较强的剪胀特性;不同围压下,砂卵砾石料的峰值强度与围压之间近似呈线性关系;两种砂卵砾石料的初始弹性模量Ei、初始泊松比νi与围压之间均存在良好的幂函数关系。结果为土石坝坝基覆盖层砂卵砾石料的强度与变形特性研究提供了参考。
The gravel material of Shuangjiangkou earth-rock dam and Changheba embankment dam foundation with the same grading are chosen to carry out large-scale triaxial tests on the consolidation earth pressure coefficient K0 under four different confining pressures. The results of K0 Strength and Deformation Characteristics of Sand and Gravel Materials under Conditions. The results show that the sand-gravel material under K_0 condition shows strong dilatancy under low confining pressure. The peak strength of the sand-gravel material under the confining pressure has an approximate linear relationship with the confining pressure. The initial elastic modulus Ei, the initial Poisson’s ratio νi and confining pressure of the gravel material all have a good power function relationship. The results provide a reference for the study of strength and deformation of overburden sand-gravel material of earth-rock dam.