| Peripheral rock large deformation is a kind of great hazardous geology casualty of underground engineering. By now, the 317th roadway Zhe Gu Mount Tunnel has happened several times large deformation hazards, cognition the mechanism of large deformation and taking effective control measurements is very important to assure the smoothly construction of Zhe Gu Mount Tunnel .The dissertation detailedly explains the engineering geology conditions of Zhe Gu Mount Tunnel area, and has researched the crustal stress development process and the regulation of distribution. According to mounts of site tracing investigations, author has researched the formation mechanism of wall rocks at Zhe Gu Mount Tunnel. On the base of engineer geology analysis, applying the modern support theory and construction conception of underground engineer, and combining with modern monitor technique and numerical simulation, has researched and discussed about support, forecast and information design-construct etc. three phase on large deformation' prevention. Obtain these chief research achievements.(1) The method of hydraulic fracturing, Kaiser Effect experiment and the Finite Element Numerical simulation computation results ,the direction of maximum horizontal principal stress intersect the small-angle of tunnel axial line, it is favorable to the stability of tunnel peripheral rock ; according to the test rust of field stress-relief method, at the present time, Zhe Gu Mount tunnel haven't access to high crustal stress site, maximum principal stress magnitude is 17Mpa~20Mpa.(2) According to tracing research of tunnel peripheral rock deformation and fracture characteristic, profoundly research about Zhe Gu Mount tunnel peripheral rock large deformation's formation mechanism and model , then consider the Zhu Gu mount;s large deformation has particular mechanism model, diversity tradition cognition of large deformation.(3) To detailedly describe advancement of the support theory of NATM, adopt FLAG3D to proceed numerical simulation analysis to various support structural strengthen mechanism. According to Zhu Gu Mount specific geology characteristic, establish a suite of schedule which service the support design about peripheral rock; at the basic of the upward research achievement establish the large deformation's support principle, making a suite of large deformation support design scheme .(4) on theoretical to explain several predicted basic problem, establish a suite of much completely predictive technical system of large deformation ,through specific application to canonical fragment, certificate that applicability and validity of this predictive system.(5) Adopt multi amount measure technology to monitor peripheral rock and support structur, apply information design-construct technology, according to upward research finding apply site structure on large deformation preventive, to certificate that the superiority and necessity of information construction. |
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