堆积层边坡位移矢量角的形成作用机制及其与稳定性演化关系的研究

通过对堆积层边坡不同稳定性演化阶段的变形性质和基本构成的分析，发现堆积层边坡表层位移矢量角是由整体滑移矢量角、压缩位移矢量角、塑性变形位移矢量角及蠕动变形矢量角构成。且其构成比例是随着边坡的不同位置及不同稳定性演化阶段而变化。同时，对表层位移矢量角在堆积层边坡不同稳定性演化阶段的形成作用机制进行了深入分析与探讨，分别建立了堆积层边坡压缩变形阶段和塑性变形阶段的表层位移矢量角与相应位移速率及其他参数的定量关系，总结了位移矢量角在不同演化阶段及不同部位的变化规律。最后运用新滩滑坡不同演化阶段的实际位移监测资料进行了验证分析，发现新滩边坡稳定性不同，则演化阶段的坡体位移矢量角具有不同变化规律，而且这些动态变化规律与该边坡实际变形失稳阶段相吻合。

STUDY ON THE FORMING MECHANISM OF DISPLACEMENT VECTOR ANGLE AND STABILITY EVOLUTION RELATION OF ACCUMULATIVE-FORMATION SLOPES

Through the analysis on deformation property and the basic constitution of different stability evolution stages of the accumulative-formation slope, it is found that the surface displacement vector angles of slope are constituted of whole sliding vector angles compressive displacement vector angle, plastic deformation vector angle and creeping deformation vector angle. And the ratio of its constitution is varied with different position and the different stability evolution stage. The formation mechanism of displacement vector angles in different stability evolution stages of the accumulative-formation slope is deeply analyzed and explored. The quantitative relationships among surface displacement vector angles, displacement velocity, the other parameters in the stages of the compressive deformation and the plastic deformation are established, respectively. The variation laws of displacement vector angles in the different evolution stages and different positions are also summarized. Finally, based on the analysis on the actual displacement monitoring data of the different evolution stages of Xitan landslides, it is found that the displacement vector angles of the slope are of different variation laws in different stability evolution stages, and these dynamic variation laws are coincided well with the actual landslides stage.