基于透明土技术土岩边坡滑移机理的模型试验研究

随着工程技术的飞速发展,土岩边坡滑移机理的研究具有重要的意义和工程应用价值。通过透明土模型试验研究坡顶荷载作用下土岩界面接触滑移机理和规律,实现了土岩边坡内部滑移变形的可视化。考虑了岩体Barton节理粗糙度系数、坡体角度和坡体高度等因素对土岩边坡稳定性的影响。利用粒子图像测速(PIV)和激光散斑技术,获得了土岩边坡在坡顶荷载作用下内部变形的特征。试验分析表明,土岩边坡的滑动可分为3个阶段:初始阶段、匀速阶段和加速阶段;在土岩边坡滑移过程中减小岩体Barton节理粗糙度系数、增大坡体高度、增大坡趾角度将引起边坡土体内部较大的位移,进而引发土岩边坡的失稳。采用双排抗滑桩的边坡防护措施后,有效地延缓边坡土体内部位移的发展,提高土岩边坡的稳定性。文中研究成果为揭示土岩边坡滑移机理及其工程防护的有效性提供了重要的理论依据,通过跟踪透明土颗粒的运动轨迹实现土体内部变形可视化的土岩边坡滑移提供了试验依据。

Model tests on sliding mechanism of soil-rock slopes based on transparent soil technology

With the development of engineering technology, it is of great significance and engineering application value to study the sliding mechanism of soil-rock slopes. The transparent soil model tests are used to study the contact mechanism of soil-rock interface and the internal movement law of slope soils under external force, and the visualization of internal deformation of soil-rock slopes is realized. The influences of Barton joint roughness coefficient, slope angle and soil thickness on slope stability are considered. Using the particle image velocity (PIV) and the laser speckle technique, the internal deformation characteristics of soil-rock slopes under external force are obtained. It is shown that the sliding of soil-rock slopes can be divided into three stages: initial stage, uniform stage and acceleration stage. In the sliding process, reducing the Barton joint roughness coefficient of rock mass, increasing the thickness of soil layer and increasing the slope angle will cause larger displacement in the soil body of the slopes, and then lead to the loss of soil-rock slopes. After adopting the slope protection measures of double-row anti-slide piles, the development of the internal displacement of slope soils is effectively delayed, and the stability of soil and rock slope is improved. The research results may provide an important theoretical basis for revealing the sliding mechanism of soil-rock slopes and the effectiveness of Engineering protection as well as an important experimental basis for visualizing the sliding of soil-rock slopes by tracking the trajectory of transparent soil particles.