| At present, the collapse of dangerous rock has been considered to be one of themost serious geological disasters Which can take deliver threat to the lives andproperty of the peoples around. Therefore, it is With great importance to take anin-depth study into dangerous rock. The collapse often happens in a sudden andhidden, Which can cause a severe Result.With the rapid development of urban construction and strengthening the capacityof human transformation of nature, exploitation of resources, such as slopingexcavation construction, mining and other human activities caused by loose, AndWith the local geological structure is complicated, more and more dangerous rockcollapse of such geological hazards happen. Especially When it is in the rainy season,landslide disaster is particularly prominent.The author select the unstable rock of the back mountain Yangliuping primaryschool as the research object.Because the ROCKS of area in GeShizha Township isrepresentative and typical.The dangerous rock in research area is located in theYangliuping, Geshizha village, middle of the Danba county. Lied on the left bank ofGeshizha River, it is about10kilometers to Danba county town and its administrativeregionalization belongs to Geshizha village. Distributing on the steep cliff of the backhill in Yangliuping primary school, Which area is With long history and steep terrain,the dangerous rock crushed, the unloading crack, tectonic fissure and Weatheringfracture is very intensive.The banding rock is in a basically stable to unstablesituation, part the rock is in unstable. According to the data of previous research Workand field research in the field, to identify dangerous rocks distributed on the plane iscontrolled by the cliffs development direction in the plane roughly linear growth cliffsdistribution, total We found the developed25dangerous rocks, the top body altitudeis about2045~2170m, belonging to supra-high dangerous rock. Influenced bytectonic fractures, unloading fissures, cracks and Weathered or combined effects ofthe level of fissures, they Were cut to a variety of forms, Which in the space form, manifested as massive body, cylindrical body, irregular and Wedge-shaped, etc. Butoverall they showed a columnar form. Sizes are different,ranging from0.55~1924.44m3,belonging to small-large dangerous rocks, the total volume is about5.7×103m3.Based on the dangerous rock formation mechanism and influenced factors andlearning, research, combining With the actual situation of the specific primaryYangliuping mountain dangerous rocks, We identify the mechanism of the processand the development of dangerous rocks bred. Dangerous rocks are formed under acombination factors, they Will experience a long period of evolution. By summarizingthe impact factors of dangerous rock, the results can be summarized into internal andexternal two factors. According to developed characteristics of Yangliuping dangerousrock and combining With stereographic projection, preliminary judgment ofdangerous rock is made to be the unstable mode. After a stability calculation andevaluation, few more unstable modes of dangerous rocks are also judged. Wepredicted in the three operation conditions, how are the failure modes and failuremechanism Works, so as to provide the basis for the future management of variousdangerous rocks. By applicating discrete element UDEC software to simulate atypical W10dangerous rock band under storm conditions in the Whole process ofinstability, instability modes and mechanisms to determine the area of unstable rock.According to the survey site rolled the rock path, combining theoretical analysis andthe use of Rockfall software, Danba County’s Primary Yangliuping dangerous rockmountain rockfall motion path simulation, roughly We determine the rockfalltrajectory and energy levels for the election after being Network type and location toprovide evidence. Prevention based on relevant norms and regulations unstable rock,judgment and analysis by dangerous rocks rolled down the track stability andreasonable preventive measures recommended in the unstable rock zone.The specific content of this paper is as follows:(1) Based on the previous Work of this area, the characteristics, geneticmechanism and developmental mechanism of dangerous rock has been further studiedthrough site survey. The dangerous rocks distributed in the nine-year Yangliupingelementary school, is a high boulders and medium-sized dangerous rocks. Unstablerock distribution in the plane direction is controlled by the development of cliff, in aplane substantially linear development cliffs distribution. ROCKS by tectonicfractures, unloading fissures, cracks and Weathered the combined effects of the level of fissures, cracks Were cut to form a variety of forms, Which in the space form,manifested as massive body, cylindrical body, irregular and Wedge-shaped, etc. butoverall showed a columnar. Sizes and scales are different.（2）Use the “Rockfall” numerical simulation software to find out the motion pathand energy level of the dangerous rock of the most dangerous section. Finally thatrock rolled to the foot of mountain With the bouncing height of4.8m.(3) In the heavy rain conditions, the use of discrete element analysis softwareUDEC stability of the numerical simulation of unstable rock area, and simulationresults with the theoretical limit equilibrium binding analysis results provide atheoretical basis for the prevention and control measures.(4) Conduct research and development strength of Dangerous divided. Is dividedinto three regions, a strong growth area, a moderate growth area, a weakly developedarea. According to Chapter III of dangerous rock characteristics and numericalsimulation and calculation of Chapter IV, unstable rock to draw conclusionsunfavorable direction.(5) The use of numerical simulation software ROCKFALL most dangerous riskprofile to determine the movement of the stone paths and energy levels. Finally rolledto the foot of dangerous rock instability, bouncing maximum height4.8m, in order todetermine the height and level design is Network.(6) Integration of the various characteristics of unstable rock, taking the anchor,to fill the gap, Active Protection Network three kinds of active prevention measuresintegrated control. |
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