Study On The Influence Zone Of Adjacent Construction Of Over Crossing Tunnels

With the comprehensive development of underground space utilization,a large number of problems about adjacent engineering of tunnels and underground had appared.While most of researches on adjacent construction are based on experience and case study with little system study,it seems from actual design norms of China that such reaches are mainly based on no-sphere of influence of elastic solution and empirical value,or separate model,which lack of require and sufficiency analysis by theory.For framing norms and guides,it's necessary to do some research on the theory.The thesis did the research on the particularity and universality of the adjacent construction which depending on the project of YunNan province which under crossing hydraulic tunnel construction imposed on the existing railway tunnel,by using the method of numerical analysis,field test.The following achievement and outcome was gained:1,The range of construction for hydraulic tunnel with impact to railway tunnel is about the direction of the excavation.The settlement of the railway tunnel on the intersection of the two tunnels is increasing with the excavation of hydraulic tunnel.The excavation of hydraulic tunnel leads to settlement seriously in the range of 2D to 4.5D.2,Uneven settlement is led in cross-section with excavating of hydraulic tunnel,which is similar to torsional deflection of railway lining.3,By analyzing of result of field test,we can find settlement regularity in field test is accordant to that in numerical calculation,which proves that the method in numerical calculation is reasonable.4,The thesis,according to adjacent influence degree and influence zone,by statistic mechanics,basing on strength criterion,studys the geometric adjacent degreeα_0ij,the one influence by depthα_4ij,and the synthesis coefficient K_ij, puts forward the influence subzone based on ration of depth(H/D)with geometric adjacent degree A.