松散击实火山岩坡残积土的应力应变特性及其对滑坡的意义

Stress strain behavior of a loosely compacted volcanic derived soil and its implications to landsliding

本文对松散击实火山岩风化坡残积土开展了等压固结排水和不排水剪、偏压固结常剪应力排水剪试验，揭示了该类土的应力应变特性，得到了临界状态线。在此基础上，分析了击实填土边坡在暴雨条件下的破坏机理。

To investigate the stress strain behavior of a loosely compacted volcanic derived soil and the mechanism of rainfall induced fill slope failures, triaxial tests, including isotropically consolidated drained and undrained compression and anisotropically drained tests at constant deviatoric stresses, are performed on loosely compacted specimens prepared by moist tamping The critical state line is obtained in the e log p ′ and q p′ plots The soil is of perfect plastic behavior after peak strength in the stress strain relations, and the drained tests at constant deviatoric stresses indicate that very small strains are needed for initiation of failure triggered by pore water pressure rise The mechanism of fill slope failures induced by infiltration of rainwater is analyzed based on laboratory test results