青藏高原东北部高填路基变形特征及处置方案研究  

Study on the Deformation Characteristics and Disposal Scheme of High-filled Subgrade in the Northeast of the Qinghai-Xizang Plateau

作　　者：林彦德 张兴举 Lin Yande;Zhang Xingju(Qinghai Geotechnical Engineering Survey Institute Co.,Ltd.,Xining 810008,China;CCCC Second Highway Survey and Design Institute Co.,LTD.,Wuhan 460053,China)

机构地区：[1]青海岩土工程勘察院有限公司,西宁810008 [2]中交第二公路勘察设计院有限公司,武汉460053

出　　处：《青海科技》2024年第3期175-182,190,共9页Qinghai Science and Technology

摘　　要：针对同赛公路K44+920~K45+020段高填方,施工时换填上部非湿陷性黄土状土后,发现底部有渗水,施工时地下水和覆盖层处治力度不足,造成填方高约4 m时坡体出现较大规模的变形。为此,从滑坡成因、地质特征、几何特征出发进行了分析,并采用极限平衡法对目前、工后的饱和、地震工况进行稳定性分析计算,并提出了在填方体内侧边沟下部设置深约3 m、基底位于下伏泥岩深度不小于0.5 m的截水盲沟;卸载目前填方,继而对下伏软弱饱水层进行彻底清除,并设置必要的排水盲沟后重新回填;在填方边坡的坡脚部位设置隔断式抗滑桩或护脚墙的处置方案。处置后滑坡处于稳定状态,治理效果良好。For the high filling of the K44+920~K45+020 section of Tongsai Highway,after filling the upper non-wet collapses loess-like soil during construction,it was found that there was water seepage at the bottom.During construction,the groundwater and the covering layer were insufficient,resulting in large-scale deformation of the slope when the filling side was about 4m high.To this end,it is analyzed from the cause,geological characteristics and geometric characteristics of landslides,and the limit equilibrium method is used to analyze and calculate the stability of the current and post-construction saturation and seismic conditions.It is proposed to set a interception blind ditch with a depth of about 3m in the lower part of the side groove of the filling body,and the base of which is located in the lower mudstone with a depth of not less than 0.5m.Unload the current filling,then completely remove the weak saturated water layer,and set up the necessary drainage blind ditch before re-filling.Set up a disposal plan for partition anti-slip piles or foot protection walls at the foot of the slope.After disposal,the landslide is in a stable state,and the treatment effect is good.

关 键 词：抗剪强度 稳定系数 剩余下滑力 稳定状态 剪切破坏 

分 类 号：P642[天文地球—工程地质学]