Analysis Of Pressure From Surrounding Rock Of Closely Double Highway Tunnel In Slope

In recent years, a new type of tunnel structure—neighborhood tunnel Has been discovered, which is interpose of commonly separability tunnel and multi—arch tunnel,which can increase the integral stability of tunnel and simplify the construction procedures and reduce the cost of project. The issue of bias tunnel that beveled with slope appeared, for the sake of commendably join bridges and tunnels, which was affected by linetype and terrain and geologic condition etc.Presently, one of difficult issues in civil engineering circles is the design and construction of neighborhood unsymmetrically loading tunnel. The surrounding rock pressure should be lucubrated, because firstly Time of tunnel construction is not long, secondly its academic study is far backward of the engineering application, and lastly tunnel surrounding rock has the specialty of complexity. In this thesis , the development and current status of neighborhood unsymmetrically loading tunnel has been introduced, and on basis of before, through through numerical analysis means and theoretical analysis means, then the studies and discusses related issues with the practice of certain neighborhood unsymmetrically loading tunnel at Sanming-Fuzhou section of Beijing—Fuzhou freeway has been done, the results of numerical simulation and theoretical calculation has been analyzed and compared .In this paper such work as follows has been done: (1) the engineering practice of certain neighborhood unsymmetrically loading tunnel at Sanming-Fuzhou section of Beijing—Fuzhou freeway has been briefly described. (2) On basis of relevant theories and methods of surrounding rock pressure of forerunners, the calculation methods of surrounding rock pressure of neighborhood unsymmetrically loading tunnel has been promoted, and recommending relevant calculation formulas of surrounding rock pressure of neighborhood unsymmetrically loading tunnel has been recommended. (3)According to practical engineering, through numerical simulation and theoretical calculation method of surrounding rock pressure of neighborhood unsymmetrically loading tunnel, under the variation of tunnel net distance, slope gradient of ground upper surface, tunnel depth, the influence of surrounding rock pressure has been analyzed, and the distribution characters and variability of surrounding rock pressure in above-mentioned conditions has been received. (4) The results of numerical simulation and theoretical calculation has been analyzed and compared, the reliability of theoretical calculation formulas of surrounding rock pressure in the above-mentioned conditions has been demonstrated, and the conclusion has been received.According to theoretical analysis and numerical simulation, the variation characters of tunnel surrounding rock pressure in above-mentioned conditions has been summarized , and the reference information for the design and construction of neighborhood unsymmetrically loading tunnel has been provided.