The Study Of Influence Partition About Intersecting Railway Tunnel During Construction And Earthquake

With the sustainable development of Chinese transportation network, new tunnels crossing with the existing tunnels become more and more often; with the new tunnel construction, surrounding rock of the existing tunnel will become relax, especially when a number of tunnels construct adjacently, this influence will be more obvious, in severe case, it will cause structure failure of the tunnel and collapse、slip of the local or whole surrounding rock. Therefore, the chosen of suitable construction method and reinforcement measures according to construction influence partition seem to be more important. Base on key project of combined fund of highway, taking Shen-Dan passenger dedicated line stereo cross with the Tong-Jin contact lines the2nd strawberry ditch tunnel and the Jin-Dan contact lines Pandaoling tunnel as engineering background, using of theoretical analysis、numerical calculation and other methods, regularity study of crossing tunnel under different influencing factors are done systematically, on the base of putting forward the influence partition, preliminary study of dynamic calculation of earthquake and influence partition is done according to its strength criterion. The main contents and achievements can be seen as follows:(1) According to the literature research, orthogonal experimental design and numerical calculation, influence from large to small is rock grade、rock height, crossing angle、structure form、construction sequence and depth of burial.(2) According to the100three-dimensional finite element numerical calculation models, in case of different rock height between the two tunnels、rock grade and the crossing angle, regularity of constructing tunnel impacting on existing tunnel is analysed explicitly.(3) One base of the above caculating results, taking advantage of nonlinear fitting theoretical analysis method, partition of impact of high speed railway crossing tunnel construction under different influence factors (rock grade、rock height and crossing angle) is got.(4) Taking advantage of three-dimensional dynamic finite element numerical calculation method, influence regularity of supporting structure of high speed railway crossing tunnel under earthquake is analyzed, and also the earthquake influence partition is investigated preliminary.