Research On The Stability Analysis Of Dangerous Rock Mass And Movement Characteristics Of Rolling Stone

With the development of one belt,one road and one big power,the major strategic decisions of the country are going forward,the large scale transportation infrastructure projects in China's mountainous areas have been constructed on a large scale in areas with complex geological conditions and frequent geological disasters,in which the hidden sudden and serious consequences of dangerous rock collapse disaster is one of the common technical problems in the process of engineering protection and treatment,especially the seismic rock slope in high-intensity areas.Under the action of natural weathering,rainstorm and earthquake,this type of rock slope is difficult to control Slope instability often causes huge economic and property losses.However,the failure mechanism of this type of dangerous rock involves many subjects such as mathematics and mechanics.The calculation process is undoubtedly very complex.How to judge the stability of dangerous rock in time and obtain the falling rock movement process and then to carry out the research on the track and characteristics of the dangerous rock has become one of the hot research topics and technical difficulties in this field.Therefore,it is of great significance to reveal the failure mechanism of the dangerous rock slope pragmatic value.Based on the back mountain dangerous rock project of Caopo village,Yonghe Township,Jiuzhaigou County,combined with detailed geological exploration,theoretical derivation and numerical simulation,this paper studies the stability,failure mode,rockfall movement track and characteristics of dangerous rock in high intensity area,the specific research contents and conclusions are as follows:(1)Combined with UAV photographing technology to carry out detailed geological exploration,the basic information such as geological background,basic characteristics,relative spatial position and threat object of the target dangerous rock area is identified,and the formation mechanism and disaster conditions of the target dangerous rock are analyzed.According to the potential instability mode of the dangerous rock,the target dangerous rock is divided into sliding type,dumping type and falling type Based on the shadow method and field investigation,various kinds of dangerous rock models are established,and then the current stability qualitative evaluation and potential instability mode analysis of the scarp zone and dangerous rock mass are carried out.The results show that the dangerous rock mass and scarp zone are basically stable under the current situation.(2)Based on the limit equilibrium method,the quantitative analysis of the stability of various target dangerous rock mass under natural conditions,rainstorm conditions and earthquake conditions is carried out.Using Locaspace viewer and Arc GIS software to extract the terrain data,combined with Rhino software to generate the three-dimensional model of the study area,and then establish the FLAC 3D fine geological model of the target dangerous rock,and the displacement,stress,strain and stability of all kinds of dangerous rock are analyzed,which proves the reliability of the calculation results.(3)Using roccall software to generalize the movement profile of dangerous rock mass,and then establish a two-dimensional numerical model of dangerous rock mass.The movement trajectory and movement characteristics of each dangerous rock mass are simulated.The bounce height,kinetic energy and maximum drop distance of each dangerous rock mass are analyzed.The results show that the W01?W04 rock mass only directly threatens the safety of residential building 1 under the action of slope friction resistance The W05?W11 rock blocks directly threaten the safety and stability of two residential buildings;PFC numerical simulation software is used to establish a threedimensional particle flow dispersion element numerical model of slope dangerous rock.By introducing the 2008 Wenchuan earthquake wave,the movement velocity,movement position and movement path of each dangerous rock block under the earthquake action are obtained.The results show that w06-w08 and W10 rock blocks are in an unstable state under the earthquake action,which seriously threatens the life and property safety of residents below;Then according to the characteristics and damage degree of the target dangerous rock,combined with the above research results,the comprehensive treatment scheme of the target dangerous rock is put forward.