半空间SV波斜入射在土体中的应力路径及空心圆柱动扭剪试验模拟

Half-space SV wave oblique incidence stress path in soil and hollow cylinder dynamic torsional shear test simulation

根据半无限弹性空间中地震波的传播理论,给出了SV波斜入射时土体中的应力场计算公式。以天津滨海软土场地为例,分析了不同入射角、不同频率SV波入射下,不同深度土层的应力差异,并以动强度指标理论分析了SV波斜入射下的的最不利情况。利用GCTS空心圆柱扭剪仪对土样进行四向加载,模拟了SV波斜入射时的应力路径,并与理论计算值进行对比,验证加载方式的可行性。结果表明:试验得出的应力路径不管是横轴方向还是纵轴方向都偏小于理论计算值,应力路径的长轴方向比较符合理论计算,短轴方向存在一定误差。

According to semi - infinite elastic theory of seismic wave propagation in space, soil mass stress field under action of SV wave oblique incidence was given out. Tianjin Binhai soft soil site, for example, analyze the different angles of incidence, at different frequencies SV wave incident stress differences of soil depth, and dynamic strength index theory analysis SV wave oblique incidence under the most adverse circumstances. Using GCTS hollow cylinder torsional shear apparatus for soil samples four-way load simulation when SV wave oblique incidence of stress path, and with the theoretical values are compared to verify the feasibility of loading. The results showed that： stress path tests obtained either horizontal direction or the longitudinal direction are smaller to theoretical calculations, the longitudinal direction of the stress path more in line with theoretical calculations, there are some minor axis direction error.