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      저자 : Tingkai Nian (검색결과 2 건)
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        Analytical solution of seismic stability against overturning for a rock slope with water-filled tension crack

        Zhang, Yanjun,Nian, Tingkai,Zheng, Defeng,Zheng, Lu Techno-Press 2016 Geomechanics & engineering Vol.11 No.4

        Steep rock slope with water-filled tension crack will happen to overturn around the toe of the slope under seismic loading. This failure type is completely different from the common toppling failure occurring in anti-dipping layered rock mass slopes with steeply dipping discontinuities. This paper presents an analytical approach to determine the seismic factor of safety against overturning for an intact rock mass slope with water-filled tension crack considering horizontal and vertical seismic coefficients. This solution is a generalized explicit expression and is derived using the moment equilibrium approach. A numerical program based on discontinuous deformation analysis (DDA) is adopted to validate the analytical results. The parametric study is carried out to adequately investigate the effect of horizontal and vertical seismic coefficients on the overall stability against overturning for a saturated rock slope under two water pressure modes. The analytical results show that vertically upward seismic inertia force or/and second water pressure distribution mode will remarkably decrease the slope stability against overturning. Finally, several representative design charts of slopes also are presented for the practical application.

      • KCI등재

        Centrifuge Model Test on Anti-dip Rock Slopes with Unequal Thicknesses Subjected to Flexural Toppling Failure

        Runqing Wang,Wei Zhao,Tingkai Nian,Chunpeng Liu,Hao Wu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.6

        Flexural toppling failure of anti-dip rock slopes (ADRSs) with layers of equal thicknesses has been investigated by many researchers, however, in natural slopes, rock layers in ADRSs are often of unequal thicknesses. To analyze this condition, six slope models were manufactured with glass plates and tests were conducted in a geotechnical drum centrifuge. In these experiments, deformation and interlayer force characteristics were obtained with cameras and film pressure sensors. The centrifuge test results show that the failure process can be divided into three stages: failure of the slope toe, development of fractures and failure of the slope. Initial toe failure has little effect on the stability of the upper rock mass. Through centrifuge test results, it is determined that slopes with only thick layers therein can be used in the evaluation of the stability of slopes with layers of unequal thicknesses. This is because thicker strata have a greater bending stiffness and bending strength than thin strata, thus influencing slope deformation and stability.

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