| Rolling stone is a shallow failure mode, especially in high and steep slope,which isone of serious geological disasters.Since it has a sudden, randomness, predictionuncertainty, violence and destruction form of complex and diverse characteristics, It hasbeen the key points and difficulties in slope engineering survey control. Based on thenational natural science foundation of China(51108488/E080602) and combining LiangBai yangshu village renovation project in Nan Jiangxian town of Ba Zhongshi city,dangerous rock by means of surveying and mapping pit engineering survey, engineeringgeological, indoor sample test exploration methods, such as a comprehensive system ofresearch area topography and geomorphology, geological structure, hydrogeologicaland dangerous rock distribution scale, development characteristics, formationmechanism and, as well as failure mode on the detailed survey and analysis, on the basisof the research We studied the rock stability calculation and analysis, and rolling stonetrajectory numerical simulation analysis of dangerous rock and rolling movementcharacteristics and influence factors of research and analysis, and rolling stoneprotective measures of dangerous rock. In this paper, specific research content asfollows:①Through the engineering geological environment in the studied area, thecomprehensive system of investigation, finding out the scale of the dangerous rock inthe study area distribution, development characteristics, formation mechanism andfailure mode.②According to mechanical equilibrium， taking the calculation method of therule,studing the30dangerous rocks in the studied area. mass stability calculation andanalysis, the focus on each one W4,W8, W9, W12, W13, W15, W18, W19, W25, W29,a total of10dangerous rock mass in the unstable state: W4、W8、W19belong toslippage instability; W9、W12、W18、W25、W29belong to the falling type instability;W13、W15are dump-type instability.③In identifying the dangerous rock mass in the study area distribution,development characteristics and formation mechanism, according to the slopegeological conditions to determine the main calculation parameters of rolling movementof dangerous rock.as the object unstable state of dangerous rock section for calculatingsection, using Rockfall software on its instability after rolling movement has carried on the numerical simulation analysis, for the whole movement process of rolling stonebounce height, impact velocity and kinetic energy distribution of calculation andanalysis, and calculate the Rolling Stones each movement characteristics of themaximum and near the road and building construction of bounce height, speed andimpact energy.④Through the numerical simulation on dangerous rock mass quality, anddangerous drop height, slope shape, restore coefficient Analyzing the main factors ofdangerous rock rolling motion, Each factor has different degrees of influence on therolling motion, in which the most serous is affect recovery coefficient, The second is theslope form.⑤Introducing all kinds of common used protective measures, and analyzing andcomparing its application condition and scope; On the basis of the stability analysis ofdangerous rock in the study area and rock movement characteristics of simulationcalculation.We has carried out the forecast analysis of dangerous rock disaster in thestudied area.Considering geological conditions, the stability of dangerous rock iscalculated in the study area and rolling movement characteristics calculation, taking"monomer governance+dangerous rock block stone+planting protection+drainage"comprehensive improvement scheme of dangerous rock roll stone protective treatment. |
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