切坡影响下缓倾顺层红层边坡变形的演化过程  

Deformation evolution process of a gently inclined red-bed slope influenced by cutting

作　　者：邵银龙 杨皓然 王俊杰[3] 杨洋 SHAO Yinlong;YANG Haoran;WANG Junjie;YANG Yang(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Huadong Engineering(Fujian)Corporation Limited,Fuzhou 350003,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [3]重庆交通大学河海学院,重庆400074 [4]华东勘测设计院(福建)有限公司,福建福州350003

出　　处：《水利水电科技进展》2022年第2期95-100,106,共7页Advances in Science and Technology of Water Resources

基　　金：福建省科技计划项目(2021Y3101)。

摘　　要：以德遂高速公路沿线典型缓倾顺层红层边坡为工程依托,依据地质分析及相似理论建立缓倾顺层红层边坡室内物理模型,采用开挖试验模拟实际工程切坡,研究坡体的变形演化过程。结果表明:缓倾角20°的顺层红层边坡随切坡呈现典型的拉裂-滑移式破坏,坡体位移均随分级切坡不断增大,水平位移均高于竖直位移,同时切坡面附近产生的位移相对于坡体其他部位较大;坡体变形主要由切坡阶段卸荷变形及静置阶段蠕滑变形两部分组成,且切坡卸荷为蠕滑变形发展创造了基础条件;切坡至软弱泥岩夹层前卸荷变形大小及速率均高于蠕滑变形,切坡至软弱泥岩夹层后坡体卸荷变形低于蠕滑变形;切坡面附近部位应力受切坡扰动较为明显,而坡体中部及后缘应力受切坡扰动较小,但坡内应力总体呈现下降趋势,即应力随切坡逐步释放。Based on a typical gently inclined red-bed slope along the Desui expressway, an indoor slope model was established according to the geological analysis and similarity theory. The excavation test was used to simulate the actual engineering slope cutting, and the deformation evolution process of the slope was studied. The results show that the longitudinal red-bed slope with a gentle dip angle of 20° presents a typical tensile-slip failure under the condition of slope cutting. The displacement of the slope increases with the cutting grades, and the horizontal displacement is higher than the vertical displacement. The displacement near the slope surface is larger than the other parts of the slope. The slope deformation is mainly composed of unloading deformation in the cutting slope stage and creep deformation in the stationary stage, and the unloading creates the basic condition for the development of creep deformation. From the uncut slope to the weak mudstone stage, the magnitude and rate of unloading deformation are higher than the creep deformation stage. After the cut slope to the weak mudstone interlayer, the unloading deformation of the slope is lower than the creep deformation. The stress near the cutting slope surface is obviously disturbed while the stress in the middle and trailing edge of the slope is less disturbed by cutting. The overall stress decreases inside the slope, indicating gradual stress release with the slope cutting process.

关 键 词：缓倾顺层红层 切坡 边坡变形 物理模型试验 

分 类 号：U416.14[交通运输工程—道路与铁道工程]