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Study on the Deformation Failure Mechanism of Metamorphic Rock Slope of Shiyan to Tianshui Expressway

Author: DuGuangBo
Tutor: NiWanKui
School: Chang'an University
Course: Geological Engineering
Keywords: Metamorphic rock slope Deformation and failure Slope structure Excavation relaxation area Finite Element Simulation
CLC: U416.14
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract


Ten days Expressway Hubei and Shaanxi sector to the well-being of paragraph east from Baihe County, Hubei, Shaanxi sector across White River, the Xunyang west Ankang City Hanbin, a total mileage of about 127 km. The line passing through the Qinling metamorphic zone, affected by the regional geological environment of the area, along the highway slope has special engineering geological characteristics and law of deformation and failure. In this paper, on the basis of field surveys, analysis the ten days highway Hubei and Shaanxi sector to along the Ankang Section of the metamorphic rock slope deformation and failure of the law, as well as influencing factors of slope deformation and failure, using the finite element method to simulate the different working conditions edges The slope of the excavation process. Obtained the following results: (1) metamorphic rock slope of the line area type of slope structure is divided into massive structure slope, layered structure slope fractured slope, the granular structure slope and pedestal structure slope five categories. Slope deformation and failure type of circuit area can be divided into wedge destruction BEDDING sliding, slicing sliding, toppling and circular slip five categories. (2) block structure Slope Bias - the orthogonal layered structure slope, lithology than the hard anti tendency layered structure slope stability. Fragmentation structure, granular structure, poor slope stability of the base structure, circular slip may occur. The Shun tendency lamellar structure slope prone BEDDING sliding lithology softer anti tendency of the layered structure of slope stability is poor, cut layers sliding or toppling may occur. (3) The the line area slope deformation and failure of influencing factors, including the Slope microrelief, slope lithology, slope structure, surface and structural characteristics of rock mass structure, rainfall and groundwater, excavation role. The slope microgeomorphology affect rock slope by the degree of weathering, thus affecting the stability of the slope. Slope in the horizontal direction of displacement by the the excavation effects of slope excavation process will form excavation relaxation area. The contact surface in the different strata of the shear stress concentration occurs. Maximum shear strain occurred after slope excavation at the top of the hill and the foot of the slope. The role of water is not conducive to the stability of the slope, the rainy season the slope often occurs destruction. When bolt length excavation within the relaxation zone, the anchor frame beam support in nursing impact on slope stability not only play the role of the slope protection. Use reasonable prestressed anchor frame beam supporting rock slope can reduce the amount of displacement, a smaller range of slope excavation relaxation area and shear deformation, can significantly improve the stability of the slope.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade > Slope
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