Prospection And Prevention Engineering Of Earthfill Landslide In Yunnan Mountainous Area

A Yunnan driver examination venues is located in tectonic erosion slope geomorphic regions,primitive landform is steep slope.Engineering construction has a large amount of excavation backfill,and greatly changed the original terrain,as a semi dig and fill the space.On the spot leveling,fill area without the corresponding survey and design work,construction firms only according to the site design floor elevation processing.The main body of the slope is the soil of the flat ground.The project started construction in December 2012,put into use in October2014,August 11,2015 examination venues edge floor began to deformation,in the evening of August 13 th strong slip,the concrete floor is broken,the slope below the retaining wall collapse,slope frame shifting,drainage ditch for scattered camber,and a large number of cracks and bulging appear on the slope,the normal operation of the entire driver's test site is affected,personnel life safety and equipment and other property security is seriously threatened in the project area.In this paper,The design combined with the survey report and construction plans of the landslide area of the driver's test site,the research ideas are:“geological survey?genetic analysis?quantitative evaluation“,according to the relevant information and knowledge required,full analysis of the landslide in special geological conditions(fill slope stability under the mountain),and on this basis,according to the topographical and geological conditions of the site selection and design for treatment of the landslide.This study include the following aspects:1.Landslide mass materia composition is mainly composed of embankment slope surface,mainly developed in the bottom soil;the terrain condition,rock and soil condition,construction condition and hydro geological condition are the basic conditions of landslide occurrence,primitive landform is steep slope,and the thickness of the upper part of the pile is the controlling factor of landslide;the main cause of landslide is rainfall;landslide is a shallow small fill engineering landslide,mechanical property is pull and removing type.2.Using the limit equilibrium method and transfer coefficient method,then the stability analysis of the landslide in the face of the broken line,and according to the calculation results,the control measures of the landslide were put forward.3.In order to ensure the overall stability of the landslide and the test road,and the effective use of the original design features of the site.According to analytical results,mainly using the Retaining Anchorage engineering,at the same time,backfill,slope,drainage and grass protection measures are auxiliary.4.After the implementation of the landslide stability analysis and simulation calculation,the results of pretreatment and after treatment were compared and analyzed,and it can be seen that the slip conditions of landslide are controlled effectively and the stability meet the requirement of relevant specification after the corresponding measures are carried out.