Experimental study on dynamic response law of bedding rock slopes under deterioration of rock mass in hydro-fluctuation belt

XU Bin; LIU Xin-rong; ZHOU Xiao-han; LIU Jun; HUANG Jun-hui; WANG Yan; ZENG Xi

doi:10.11779/CJGE202208010

Volume 44 Issue 8

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Chinese Journal of Geotechnical Engineering > 2022 > 44(8): 1453-1462. > DOI: 10.11779/CJGE202208010

XU Bin, LIU Xin-rong, ZHOU Xiao-han, LIU Jun, HUANG Jun-hui, WANG Yan, ZENG Xi. Experimental study on dynamic response law of bedding rock slopes under deterioration of rock mass in hydro-fluctuation belt[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(8): 1453-1462. DOI: 10.11779/CJGE202208010

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Experimental study on dynamic response law of bedding rock slopes under deterioration of rock mass in hydro-fluctuation belt

XU Bin^{1, 2, 3,},
LIU Xin-rong^{1, 2, 3, ,},
ZHOU Xiao-han^{1, 2, 3},
LIU Jun⁴,
HUANG Jun-hui⁵,
WANG Yan^{1, 2, 3},
ZENG Xi^{1, 2, 3}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing University, Chongqing 400045, China
3.
Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education, Chongqing University, Chongqing 400045, China
4.
China Construction Second Engineering Bureau Ltd., Beijing 100160, China
5.
Guangzhou Design Institute, Guangzhou 510620, China

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Received Date: August 03, 2021
Available Online: September 22, 2022

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Abstract

Abstract

The deterioration of rock mass in hydro-fluctuation belt and the reservoir-induced earthquake, which are caused by the impoundment in the area of Three Gorges Reservoir, have a great impact on the stability of the bank slopes. The shaking table model tests are conducted to investigate the cumulative damage mechanism and dynamic stability of bedding rock slopes subjected to continuous seismic loads under the deterioration of rock mass in hydro-fluctuation belt. The results indicate that: (1) The acceleration response of slopes is significantly characterized by "elevation effect" and "surface effect", and the PGA amplification factor weakens obviously after several times of seismic loads. The cumulative displacement, pore water pressure and earth pressure of slopes show the trend of increasing, increasing and decreasing, respectively, with the continuous action of seismic loads. (2) The damping ratio, natural frequency and damage degree of slopes show the trend of increasing, decreasing and increasing gradually, respectively, with the continuous action of seismic loads. The nonlinear cumulative damage mechanical model for slopes under the action of micro-earthquake and strong earthquake can be characterized by "S-typed" cubic function and "steep rise" exponential function, respectively. (3) The evolution process of cumulative damage and instability failure of slopes can be summarized as: the initiation, propagation and penetration of the back edge of slope top (secondary joints and planes), the overall sliding of rock mass along the composite sliding surface, and the accumulation of the multi-scale broken blocks of rock mass at the foot of slopes after complete failure. Moreover, the rock mass in hydro- fluctuation belt is seriously broken by the coupling action of vibration, dissolution and erosion, and nearly slips as a whole to form a significant "cavity".

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