The tensile strength of gravelly soil plays a decisive role in the formation or initiation of longitudinal cracks or hydraulic fracturing in the core of earth and rockfill dams. For this study, a series of uniaxial tensile tests and consolidated drained triaxial shear tests was carried out to study the relationships between the tensile strength and shear strength indexes of gravelly soils with gravel contents ranging from 0% to 50%. The test results indicate that the tensile strength decreases linearly with increasing gravel content when the soil is at its maximum dry density and optimum water content. An equation for estimating tensile strength of gravelly soil without tensile strength testing is proposed. The relevant test results can provide guidance for anti-crack designs for earthcore rockfill dams.

砾石土的抗拉强度在土石坝和堆石坝核心的纵向裂缝的形成或引发或水力压裂中起着决定性的作用。为了进行这项研究，进行了一系列的单轴拉伸试验和固结排水的三轴剪切试验，以研究砾石含量为0％至50％的砾石土的拉伸强度与剪切强度指标之间的关系。试验结果表明，当土壤处于最大干密度和最佳含水量时，抗拉强度随砾石含量的增加而线性降低。提出了在不进行抗拉强度试验的情况下估算砾石土抗拉强度的方程式。相关的测试结果可以为土石堆石坝的抗裂设计提供指导。