论文部分内容阅读
采用自主研发的可视化试验装置,参照某泥石流现场试验进行了离心机模型试验,研究典型滑坡型泥石流形成的宏细观机理。根据现场试验的颗粒级配和重力比,用粉砂和细砂按比例配制土样进行20g加速度下的离心机试验。利用高清数码成像设备和细观结构分析软件Geodip分别从宏观和细观角度分析了滑坡型泥石流的形成模式和水土作用机理。研究结果表明:离心机模型试验较好地重现了现场试验现象,滑坡型泥石流的形成模式为自坡脚逐渐向上分块坍塌的倒退式块体滑动。滑坡型泥石流形成的原因是坡体中细颗粒随孔隙水迁移,引起孔隙水压力升高并形成底部渗流,造成坡体发生抗剪强度破坏形成泥石流。
Using a self-developed visual test device, a centrifuge model test was conducted with reference to a debris flow field test to study the macroscopic and meso-scale mechanism of typical landslide debris flow formation. According to the field test of particle grading and gravity ratio, with sand and fine sand prepared proportionally soil samples were centrifuged at 20g speed test. Using the high definition digital imaging equipment and the structure analysis software Geodip, the forming modes and soil-water mechanism of landslide-type debris flow are analyzed respectively from macro and micro perspectives. The results show that the centrifuge model test can well reproduce the phenomenon of on-site test, and the formation mode of landslide-type debris flow is the sliding-back type of block that gradually collapse from the foot of the slope upwards. The reason of landslide-type debris flow is that the fine particles in the slope body migrate with the pore water, causing the pore water pressure to rise and form the bottom seepage flow, resulting in the failure of shear strength of the slope body to form the debris flow.