某土岩结合边坡滑坡勘察及设计

Investigation and Mitigation Design for a Landslide in the Soil Rock Mixtures

依托具体工程实例,对某土岩结合边坡进行了详细滑坡勘察,分析了此次滑坡的具体特征及发生机理:该滑坡由两个相对独立的HP1滑坡、HP2滑坡组成,HP1滑坡主要沿土岩界面滑动,HP2滑坡主要为基岩层面的平面滑动。提出了滑坡的综合治理方案:HP1滑坡采用分级修坡+锚杆格构梁+排水的治理方案;HP2滑坡采用分级修坡+锚杆格构梁+排水+抗滑桩的治理方案。基于抗滑桩的基本原理,将‘m’法运用到此次抗滑桩的设计计算中,对类似工程的处理提供了可借鉴的经验。

A detailed geotechnical investigation was performed on a landslide in the soil and rock mixture slope.The characterization of the landslide and the triggering factors were able to be identified.The investigation results concluded that two relatively independent landslides,namely,HP1 and HP2,existed in the system.Slide HP1 had a slip surface along the interface of soil and rock,whereas,Slide HP2 had a planar slip surface along the weak layer in the bedrock.The landslide mitigation program was therefore determined.Within the HP1 and HP2slides,a combination of benching the slope,grid beam with ground anchors and drainage ditches was proposed.The large diameter drilled pier to resist the slide was also used in Slide HP2.The ＂ m＂ method was able to be applied in the anti-slide drilled pier design.