Research On The Development Characteristics And Control Engineering Measures Of Dangerous Rock On The Mountain Top Of The Empress Cultural Exhibition Hall Of Guangyuan City

This paper takes the dangerous rock at the top of Mountains of Queen's Culture Exhibition Hall in Guangyuan City as the research object.Through the exploration of dangerous rock mass,the characteristics,deformation and failure modes of dangerous rock mass are analyzed,and the corresponding prevention and control countermeasures are put forward,aiming at putting forward economic and reasonable prevention and control measures.The Dangerous Rock Belt at the top of the Mount of Queen's Culture Exhibition Hall is distributed in 526.58-560.19 m elevation and 72-83 degree topographic slope.It is low in the northeast and high in the southwest.It extends in the northeast and southwest.It is distributed along the slope composed of sandstones and argillaceous sandstones of the Shaximiao Formation in the Jurassic.From the bottom to the top,it is thick layered calcareous cemented sandstones and argillaceous sandstones.The whole Dangerous Rock Belt is about 151.8m.At present,there are 27 dangerous rock masses along the slope,the volume is about 1.0m3-244m3,the scale is small,the total volume of dangerous rock mass is about 975m3.The relative height of dangerous rock mass is 3-25 m,which belongs to low-medium dangerous rock mass.Cracks are well developed in this dangerous rock zone,and dangerous rock monomers are formed by cutting multiple groups of cracks.The main failure modes of dangerous rock mass are falling and sliding.Since the flat cut slope of Huangzesi construction site formed a slope,the original loose rock blocks on the surface of the slope have collapsed over the years,forming a banded accumulation along the foot of the slope.At present,many dangerous rock masses distributed in the dangerous rock zone are in an unstable state.Dangerous rocks in the area are affected by such factors as concave cavity,unloading crack,weathering,water action,earthquake,human engineering activities,root splitting of trees and so on,which have a great influence on their stability.With the aggravation of the influencing factors,the stability will become worse and worse.According to macro-analysis and calculation,the whole slope is in a stable-unstable state.Under unfavorable conditions,the slope may slip along the potential unloading fracture zone,and the dangerous rocks in the area are greatly affected by such factors as concave cavity,unloading fracture,weathering,water action,earthquake,human engineering activities,root splitting of trees and so on.With the aggravation of the influencing factors,the stability will become worse and worse.Combined with the stability analysis of dangerous rock,it can be seen that the stability of dangerous rock gradually decreases under the action of various unfavorable factors,and finally collapse occurs.According to the deformation and failure mode of dangerous rock and the results of stability analysis,the comprehensive control measures of "dangerous rock removal + inlaying + anchoring + shotcrete support + water cut ditch + biological greening" are put forward by using "self-weight + rainstorm" or continuous rainfall with high probability as design conditions.