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运用最新研制的80 t三维多功能土工试验机,对工程中常用的粗粒土与人造粗糙钢板形成的接触面在常刚度法向边界条件切向应力控制下的动力特性进行了试验研究,并分析了切向控制方式的影响。接触面在剪切时产生了明显体变,可分为可逆和不可逆两部分;可逆性剪切体变的发展程度主要与切向位移幅值有关;不可逆性剪切体变的发展与剪切路程有很大关系;接触面体变出现了一定的异向性,且受切向加载路径、切向控制方式的影响。随着循环剪切的进行接触面切向位移发生明显偏移,其幅值也逐渐增加,受切向加载路径影响较大;切向应力、应力比、法向位移与切向位移的关系与切向加载路径、切向控制方式有很大关系。接触面在初始剪切时没有达到、随后逐渐达到抗剪强度,但破坏状态持续时间很短;其抗剪强度指标与切向控制方式关系不大。
The newly developed 80 t three-dimensional multi-purpose geotextile testing machine was used to test the dynamic characteristics of the contact surface between coarse-grained soils and artificial rough plate commonly used in construction under the tangential stress control of normal stiffness boundary conditions The influence of tangential control method is analyzed. The contact surface has obvious body deformation during shearing, which can be divided into two parts: reversible and irreversible. The development of reversible shear body is mainly related to the magnitude of the tangential displacement. The development and shear of the irreversible shear body change There is a great relationship between the distance; contact surface body has changed a certain degree of anisotropy, and the tangential loading path, the impact of tangential control. With the cyclic shear, the tangential displacement of the contact surface obviously shifts and its amplitude gradually increases, which is greatly influenced by the tangential loading path. The relationship between the tangential stress, the stress ratio, the normal displacement and the tangential displacement Tangential loading path, tangential control has a lot to do. The contact surface did not reach the initial shear, and then gradually reached the shear strength, but the failure state has a short duration. The shear strength index has little to do with the tangential control method.