基于深梁试样的压实黏土抗拉强度试验研究

Tensile Strength Test Study of Compacted Clay Based on Deep Beam Specimens

将深梁试样引入压实黏土抗拉强度测试中,分析了不同含水率和干密度条件下的抗裂特性演化规律,包括荷载-挠度曲线、抗拉强度和能量参数。结果表明:压实黏土破坏模式与含水率密切相关,不受干密度影响;含水率和干密度对压实黏土试样抗拉强度影响显著,抗拉强度含水率升高先增大后减小,随干密度增大呈线性递增;断裂耗散能随含水率增大呈先增大后减小变化,高含水率时裂纹延展耗能更多。弹性储备能和裂缝延展能随试样干密度增大逐渐增大,弹性储备能增幅更大。

Deep beam specimens are introduced into the tensile strength test of compacted clay,and the evolution of the cracking resistance characteristics under different water content and dry density conditions,including load-deflection curves,tensile strength and energy parameters,are analyzed.The results show that:the damage mode of compacted clay is closely related to water content and is not affected by dry density;water content and dry density have significant effects on the tensile strength of compacted clay specimens,and the tensile strength increases with increasing water content and then decreases,and increases linearly with increasing dry density;the fracture dissipation energy increases with increasing water content and then decreases,and the crack ductility dissipation energy is more at high water content.The elastic reserve energy and crack ductility energy increase gradually with the increase in dry density of the specimen,and the elastic reserve energy increases more.