CHEN Tingjun, XIAO Shiguo, CHENG Qiang, ZHOU Huoming. 2019: LONG-TERM DEFORMATION AND STABILITY ANALYSIS OF GRAVITY ANCHORAGE SLOPE ON KANGDING BANK OF DADU RIVER BRIDGE IN LUDING. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 632-639. DOI: 10.13544/j.cnki.jeg.2018-253
    Citation: CHEN Tingjun, XIAO Shiguo, CHENG Qiang, ZHOU Huoming. 2019: LONG-TERM DEFORMATION AND STABILITY ANALYSIS OF GRAVITY ANCHORAGE SLOPE ON KANGDING BANK OF DADU RIVER BRIDGE IN LUDING. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 632-639. DOI: 10.13544/j.cnki.jeg.2018-253

    LONG-TERM DEFORMATION AND STABILITY ANALYSIS OF GRAVITY ANCHORAGE SLOPE ON KANGDING BANK OF DADU RIVER BRIDGE IN LUDING

    • The long-term deformation and stability of gravity anchorage slope is one of the most important problems affecting the natural serviceability of the suspension bridge engineering. In order to discuss the problem reasonably, the gravity anchorage slope on Kangding Bank of Dadu River Bridge in Luding is taken as an engineering example. Firstly, in-situ shear and compression tests of the slope soil are carried out. The stress field of the gravity anchorage slope is obtained with three-dimensional elastoplastic numerical simulation method. Based on these results, the loading conditions of the direct shear creep test are determined. Then the direct shear creep test is carried out for the slope mainly composed of moraine soil. The creep test results show creep behaviour of the moraine soil decreases with time. In light of the creep characteristics of the soil, time-dependent combination constitutive models consist of Burgers and general Kelvin model individually with Mohr-Coulomb strength principle is proposed and applied in visco-elastic-plastic numerical simulation analysis of the slope. Considering the requirements of natural serviceability of the anchorage, the criterion of allowable displacement at its unique point(saddle point of the anchorage) is applied. The shear strength reduction method for long-term deformation and stability analysis of the slope is also used. The results of the practical example obtained using the present method show horizontal displacement towards the river of the saddle point is 13.19 cm when the anchorage-slope system has naturally served for 100 years. The long-term stability coefficient of the system is 1.71 to meet the requirement of its natural serviceability limit state.
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