| As a link between Mianyang and Aba city,Maoxian-Beichuan road plays an important role in the traffic network of the Northern Sichuan.As most of the mountains along the road are soft rocks such as sericite phyllite and carbonaceous phyllite in the third group of Maoxian group of Silurian system,most of the mountains are loose and broken under the influence of the earthquake,and the rockmass is of poor stability.In addition,the slope along the road is built with poor stability.The stratified rock slope in the outcrop of metamorphic rocks in Maoxian group,which is crossed by the Maoxian-Beichuan road,is taken as the main research object.Through the method of field investigation,indoor test to the research on development characteristics of layered rock slope in the studied area for further research,and the slope structure types and corresponding deformation and failure modes of layered rock slope in this area are divided in detail.Then the engineering geological characteristics of the slope rock mass in the study area are analyzed through laboratory tests.Finally,taking the Jinshan slope,a typical bedding rock slope in the study area,as an example,the stability of the slope under natural and extreme rainfall conditions was evaluated by numerical simulation.The main results of this paper are as follows:(1)On the basis of detailed investigation of stratrfied rock slope along Maoxian-Beichuan road,and considering slope on the surface of the material composition,rock discontinuity combination relationship,with slope composition,complete degree of layered rock mass,the rock layer inclination and slope direction and the relationship between strata dip Angle as a 4th level classification standard,the research area of layered rock mass slope is divided into 9 types of slope structure,and typical cases on the detailed analysis of slope is summarized on the basis of 12 kinds of deformation and failure mode;(2)By X-Ray diffraction experiment,Scanning Electron Microscopy analysis of the composition and microstructure characteristics of slope,the results show that the study area is rich in clay mineral characteristics and have a large number of microscopic structural plane,which is easy to lead to the failure of the slope.(3)The structural plane occurrence in the area,through statistical analysis research found in the structural plane has a certain regularity,the major structural plane is divided into four groups according to their occurrence parameters,calculate the homogeneous advantage the occurrence of the group are: 345°∠57°,133°∠49°,65°∠70°,280°∠68°.(4)The strength anisotropy of slope rock mass was analyzed by uniaxial compression test of sericite phyllite under different loading angles.The experiment proved that the uniaxial compression anisotropy of sericite phyllite in the study area was extremely high.In addition,the anisotropy of slope rock mass deformation and failure is analyzed by considering the stress-strain curve and deformation failure form of the sample during the test.(5)The research area of gold mountain slopes as a typical case,analysis of the slope characteristic of the sliding-bending-compaction-cut type evolution process of deformation failure mode,combined with the numerical analysis software,through strength subtraction gold mountain slope under natural conditions are analyzed and the stability of extreme rainfall condition,the results show that under the natural condition of slope,slope stability coefficient is 1.13,the slope stability under the condition of extreme rainfall coefficient of 1.06. |
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