The Study On Stability Evaluation And Treatment Measures For The K66Cutting Slope Of Guanghe Expressway

The right landslide of the cutting on Guanghe expressway Guangzhou sectionK66+250～K66+580is located in Zeng city of Guangzhou. It was formed by repeatedcollapse after the excavation of the expressway. It is a large and complex engineeringlandslide. Because the slope has a very complicated situation that includes the geology,lithology,weathering interface,groundwater and plane of weakness,etc.it caused the landslideto continue after operation was completed,and the foot of the road arched.It needs to berepaired immediately.This paper is for repairing the K66landslide effectively, according to the characteristicsof regional geological data and investigation data,with the background of the landslide,thispaper has analyzed and researched the landslide mechanism and managementengineering.Based on site investigation mainly,this paper has analyzed the geologicalenvironment,the sliding process, the sliding mechanism,and the stability of the K66landslideof Guanghe expressway cutting.Through the field physiognomy morphological characteristics,the drilling materials,the sampling data,monitoring data,the deflection shape of the landslideand the mating analysis of the structural plane,this paper has deduced the stratums of thelandslide and calculated the surplus sliding force of the typical sections on each landslide subarea. Then it puts forward comprehensive management measures,which as the core of“weight-reducing by drainage and enhancing the waist and feet”.Moreover,it demonstrates thepracticability of these measures calculates the anchor cable pulling force and anti-slide pileinternal force.It also completes the design of anchor cable frame and anti-slide pile withanchor cable.Through the geological record of anti-slide management,anchor cable andreinforcement stresses monitoring, and the analysis of the deep hole monitoring and groundsettlement observation result have confirmed that the inference of the sliding surface is logicaland the management measures are safe and effective.At present, the landslide has reached astable situation.Key problems：1.Geological environmentTo analyze and research the geological environment at the landslide site of the cutting onGuanghe expressway Guangzhou section K66.The thickness of landslide body showedchanges significantly in space.The landslide has multi-layer, multi-level,multiple slidingcharacteristics.2. Analyze the sliding mechanism and the stability Analyze the geological environment at the landslide site of the cutting on Guangheexpressway Guangzhou section K66in detail and confirm the geological data,and thenresearch the cause,influencing factors and formation mechanism of the landslide. Analyze thestability and calculate the landslide thrust according to the characteristics of slipping andgeological situation.3.Anchor piles designing and landslide comprehensive managementResearch the pile and anchor force of anchor piles,start mechanical analysis,select themost rational landslide management plan.