This study aims to determine the relationship between water content, shear deformation, and elastic wave velocity of unsaturated soil slope. The individual influence of volumetric water content and tilt angle on the normalized wave velocity through unsaturated soil was investigated through a series of adjustable slope model tests. The relationship function between volumetric water content, tilt angle, and normalized wave velocity was established. To verify the proposed relationship function, fixed slope model tests were carried out. The relationship functions could be used to estimate the behaviors of wave velocity in rainfall-induced slope failure model tests. The applicability of proposed relationship function for wave velocity behaviors is also presented. It is found that the relationship function is highly consistent with the measurements for wave velocity behaviors through unsaturated soil slope. In addition, the effects of rainfall duration/initial water content, density, slope angle, and surface layer thickness seem to be small on the decrease rate of normalized wave velocity with volumetric water content and tilt angle.

本研究旨在确定含水量，剪切变形和非饱和土边坡弹性波速度之间的关系。通过一系列可调斜率模型试验，研究了体积水含量和倾角对非饱和土归一化波速的个体影响。建立了体积含水量，倾斜角与归一化波速之间的关系函数。为了验证建议的关系函数，进行了固定边坡模型测试。关系函数可用于估计降雨诱发的边坡破坏模型测试中的波速行为。还提出了所提出的关系函数对波速行为的适用性。发现该关系函数与非饱和土边坡波速特性的测量高度一致。另外，降雨持续时间/初始含水量，密度，坡度角和表层厚度的影响似乎对归一化波速随体积含水量和倾角的降低率的影响较小。