Analysis Of The Inverted Arch Type Influence Of Stress State Of High Hydraulic Pressure Tunnel

Along with our country highway and rail transit construction into a high-speed de-velopment period, China’s big cities in the western region is formed between thehigh-speed road network, Due to the geographical conditions in western mountainous,In highway, railway construction, will encounter a lot of high water pressure in tunnelengineering. In the tunnel construction, the inverted arch is an important part of the lin-ing structure, the setting of inverted arch can improve the stress state of supportingstructure, effectively reduce the deformation of surrounding rock, to ensure the highstability of the hydraulic tunnel surrounding rock and lining play an important role. Re-search in high hydrostatic stress state of the tunnel lining structure and the impact ofinverted arch type function become one of the important research topic.The work of this paper mainly includes the following aspects:①Introduction to the typical high-pressure water disasters tunnel engineering exam-ples at home and abroad, high water pressure and inverted arch on the tunnel liningtunnel, the trends of the research status of the influence of the stress, summarized theexisting research methods and the problems existing in the research.②On the basis of lining web of pressure calculation theory, analysis the main factorsof affecting the web of pressure, discuss the existing web of tunnel lining pressure cal-culation method, according to the commonly used reduction coefficient method areanalyzed, summarize the accessor methods and application of law.③Based on the rock mass seepage principle and basic calculation model, derivationtunnel seepage field distribution, and with coupling the stress field to determine the wa-ter of the lining of pressure.④With finite element software ANSYS, to simulate the excavation of the tunnel en-gineering actual, research the stress of the high pressure tunnel lining as a result, and tocalculate the eight kinds of different forms of lining section of the tunnel, the analysisof the effect of inverted arch type of lining structure, at the same time for different rockmass and grouting stress calculation and analysis was made on the influences of thethickness of lining.⑤Through the simulation analysis, indicates that increasing the inverted arch cornerradius and decrease the inverted arch in radius reduces the maximum tension, pressureof lining structure stress and bending moment, axial force, reduce the lining structureand plastic deformation of the stress concentration of the weak position, increase the strength of the lining structure and safety. And obtain the different conditions of thetunnel invert reasonable and economy excavation area.In this paper, according to the research results show that under the effect of high wa-ter pressure, the circular cross section type of tunnel lining structure is reasonable andsafe, the inverted arch flat cross section type of stress concentration is obvious, and poorsecurity.Finally, to summarize full text research, and discuss the further research work in thefuture.