The Research On Rock Slope Stablilty Of Tian Ba Great Bridge

The Tian Ba double line bridge is one of the key projects of railway expansion project between Chongqing and Guizhou.The location of the bridge belongs to the middle mountain gorge landform.It is difficult to evaluate the stability of the bridge slope due to the complicated terrain conditions,the development of joints and cracks,and other unfavorable geological conditions.Therefore,it is of gr eat practical significance to carry out the stability analysis of the slope of the Tian Ba double line bri dge by means of scientific comprehensive means.Based on the survey data and field exploration,thi s paper studies the stability of the whole slope and the reasonable position of the bridge foundation.The thesis has completed the following aspects:1 based on the aerial photogrammetry technology and the GOCAD 3D geological modeling sof tware,the 3D geological model of the 4# dam pier of the Tian Ba double line is established.Combine d with the structural characteristics of the rock mass,the failure mode of the slope,the potential slidi ng area and the main slip direction of the slope are analyzed.The results show that the structural joint s of the slope are more developed,but the overall stability of the slopes is better.2 the mechanical parameters,such as uniaxial compressive strength and elastic modulus of rock mass,are solved by using the geological strength index GSI and the Hoek Brown strength criterion of rock mass,which are obtained by indoor experiment and field experiment.The cohesive force and in ternal friction angle of the structural plane are obtained by the Barton model.This method provides a more accurate and reasonable parameter for analyzing the stability of rock slope controlled by struct ural plane.3 the slope stability is analyzed by the method of the stereographic projection,the limit equilibri um method and the numerical simulation method.By comparing the results of the three methods,the conclusion of the slope is more stable and the part may be destroyed.4 by using FLAC3 D software,the stability of slopes under different loads of bridge foundation i s studied.By analyzing the displacement characteristic stress range and safety factor of the slope surf ace and bridge foundation base,the location range of the bridge foundation with less influence on the slope stability is defined.