To investigate the uniaxial compressive strength and deformation properties of frozen silty soil with prefabricated crack under various strain rates, the static uniaxial compressive tests were conducted for frozen silty soil using three kinds of binder materials to select the suitable prefabricated crack manufacturing method. Afterward, the static and dynamic stress-strain curves of frozen silty soil with different prefabricated crack numbers were obtained based on static and splitting Hopkinson pressure bar (SHPB) tests. In addition, the high-speed camera was employed to record the fracturing process of frozen silty soil under impact loads. Results indicated that the frozen silty soil specimens with no binder showed higher static strength compared with other two binder materials (plaster and Vaseline). The strength growth rate of frozen silty soil showed three-stage (fast-slow-rapid) change characteristics. The peak strain of frozen silty soil under static loads scope was higher compared with that under dynamic loads, while its dynamic peak strain with various prefabricated crack numbers was remarkably rate-dependent. The absorbed energy density of frozen silty soil was subject to a negative (positive) relationship with the prefabricated crack numbers (strain rate). The dominated crack of intact frozen silty soil specimen finally presented Y-shaped shear failure. However, tensile cracks parallel to stress wave propagation direction were observed for the frozen silty soil specimen with prefabricated crack.

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预制裂缝和应变率对粉质冻土单轴压缩特性影响的研究

为了研究预制裂纹在不同应变率下的粉质冻土的单轴抗压强度和变形特性，采用三种粘结材料对粉质冻土进行了静态单轴压缩试验，选择了合适的预制裂纹制备方法。然后，通过静态和分裂霍普金森压力杆（SHPB）试验，获得了具有不同预制裂纹数的冻结粉质土的静，动态应力-应变曲线。另外，采用高速摄像机记录了冲击载荷作用下冻结粉质土壤的破裂过程。结果表明，与其他两种粘合剂材料（灰泥和凡士林）相比，没有粘合剂的冷冻粉质土壤样品显示出更高的静态强度。冻结粉质土的强度增长速率表现出三阶段（快速-快速-快速）变化特征。静态荷载作用下的粉质冻土的峰值应变高于动态荷载作用下的峰值应变，而不同预制裂纹数的动态粉尘峰值应变率与速率有关。冻结粉质土的吸收能量密度与预制裂缝数（应变率）呈负（正）关系。完整的冻结粉质土壤标本的主要裂纹最终呈现出Y形剪切破坏。然而，在具有预制裂纹的冷冻粉质土壤试样中观察到了平行于应力波传播方向的拉伸裂纹。静态荷载作用下的粉质冻土的峰值应变高于动态荷载作用下的峰值应变，而不同预制裂纹数的动态粉尘峰值应变率与速率有关。冻结粉质土的吸收能量密度与预制裂缝数（应变率）呈负（正）关系。完整的冻结粉质土壤标本的主要裂纹最终呈现出Y形剪切破坏。然而，在具有预制裂纹的冷冻粉质土壤试样中观察到了平行于应力波传播方向的拉伸裂纹。静态荷载作用下的粉质冻土的峰值应变高于动态荷载作用下的峰值应变，而不同预制裂纹数的动态粉尘峰值应变率与速率有关。冻结粉质土的吸收能量密度与预制裂缝数（应变率）呈负（正）关系。完整的冻结粉质土壤标本的主要裂纹最终呈现出Y形剪切破坏。然而，在具有预制裂纹的冷冻粉质土壤试样中观察到了平行于应力波传播方向的拉伸裂纹。冻结粉质土的吸收能量密度与预制裂缝数（应变率）呈负（正）关系。完整的冻结粉质土壤标本的主要裂纹最终呈现出Y形剪切破坏。然而，在具有预制裂纹的冷冻粉质土壤试样中观察到了平行于应力波传播方向的拉伸裂纹。冻结粉质土的吸收能量密度与预制裂缝数（应变率）呈负（正）关系。完整的冻结粉质土壤标本的主要裂纹最终呈现出Y形剪切破坏。然而，在具有预制裂纹的冷冻粉质土壤试样中观察到了平行于应力波传播方向的拉伸裂纹。