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In-situ Test for Shear Strength of Platy Rock Mass and Numerical Simulation of Mechanical Effect of Platy Planes

Author: LiYuanXia
Tutor: SunJinZhong
School: Chinese Geology University (Beijing)
Course: Geotechnical Engineering
Keywords: Board physicochemical rock The strength of the board bedding planes Situ testing Ground stress Mechanical effects of structural surface Numerical Simulation
CLC: TU452
Type: Master's thesis
Year: 2010
Downloads: 119
Quote: 0
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Abstract


The rock mass strength depends largely on the strength of the surface structure, board especially physicochemical rock mass. Directly obtained by in situ testing of the strength parameters of the rock mass structure surface rock mass stability analysis and engineering design are of great significance. Traditional test methods applied and controlled test load need bulky power plant, to large test cost, and second, to test implementation is very difficult, especially mountain test. In order to understand the strength properties of the surface of the plate physicochemical pluton board management structure and its mechanical effects, in order to provide the basis for large transmission line tower foundation and other places anchor engineering, Fangshan District, Beijing Xiao juvenile camp the dolomitic board physicochemical intrusion The structure surface strength test in situ, and further expand the numerical simulation of the mechanical effects of the anchor uplift of rock mass structure surface. Through on-site survey to identify the structure of the test site rock type and structural plane; master venues rock mass structure and ground stress field based on regional geological conditions of the test site, and in situ stress measurement data. Thus adapted to local conditions, and design a new site in situ rock mass structure plane shear test methods: consider the relationship between the in board management structure surface mass occurrence of tectonic stress direction, excavation in different directions, different lift state three specimens (test pit). Space, a certain distance between the release of two parallel test pit surface protolith nature constitute horizontal test load is applied to the anti-force framework, thus eliminating the traditional trial bulky test anti-power plant. Changes in the mix because of the lifting surface, the specimens by a corresponding change in the tectonic stress state, superimposed with the test load at a predetermined shear plane formation of the different size of the normal force and tangential force. Situ shear test of rock mass structure as described above, to determine the shear strength parameters of the surface of the test site rock board management structure: the cohesion c and friction angle? This is a useful attempt situ rock mass structure surface strength test method can provide a reference for similar slate of large transmission lines anchor the basis of design and rock stability analysis. In situ test the resulting surface shear strength values ??(c, φ) on the basis of the rock mass structure, this paper further use of the ANSYS, FlAC3D software, the mechanics of the joint surface of a bolt anchorage board physicochemical rock uplift process in board The impact on the the generated anchor uplift board physicochemical rock stress and displacement field effects (including board bedding planes occurrence and pitch change) numerical simulation analysis, summarized in the face of a management board board physicochemical rock some of the effects of the mechanical properties of the law: the board bedding plane inclination greater the the biggest rock mass displacement actually was the level of change; board bedding plane spacing the greater, the greater the final displacement and a stable value. By numerical simulation to the law board physicochemical rock bolt pullout ultimate bearing capacity design provide a reference.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Rock mechanical properties and stress theory
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