Vol18 No.9: 2475-2485
【Title】Seismic responses of slopes with different angles in coral sand
【Author】ZHANG Yan-ling1,2,3; DING Xuan-ming2,3; CHEN Zhi-xiong2,3; WU Qi2,3; WANG Cheng-long2,3*
【Addresses】1 College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2 College of Civil Engineering, Chongqing University, Chongqing, 400045, China; 3 Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, 400045, China
【Corresponding author】WANG Cheng-long
【Citation】Zhang YL, Ding XM, Chen ZX, et al. (2021) Seismic responses of slopes with different angles in coral sand. Journal of Mountain Science 18(9). https://doi.org/10.1007/s11629-020-6546-9
【Abstract】This paper investigates the seismic responses of slopes in coral sand taken from a reef island in the South China Sea. A series of shaking table model tests were conducted to explore the responses of soil acceleration, excess pore pressure, and slope displacement for three slope angles (5°, 10°, and 15°). The results show that the excess pore pressure ratio of the slope decreasesdue to an increase in the initial shear stress when the slope angle increases. The acceleration response of the soil increases with the increase of the slope angle. The slope displacement presents substantial increments as the excess pore pressure ratio increases. In addition, the lateral movement, and slope settlement present substantial increments as the slope angle increases. No liquefaction is observed under a dynamic excitation of 0.2 g in the coral sand site. Under a dynamic excitation of 0.4 g, the site liquefies quickly, the acceleration amplification factor decreases, and the lateral movement and the settlement of the slope surface both increase compared with that under 0.2 g excitation. For the slope with an angle of 15° at 0.4 g, the flow distance of the sand strip increase by 289.47% compared with that in the 5° case. The lateral movement of the slope surface near the water level line is substantially larger than that away from the water line. The largest settlement is observed near the middle section of the slope (below the water level) under a dynamic excitation of 0.2 g. In contrast, the largest settlement under a dynamic excitation of 0.4 g occurs at the top of the slope.
【Keywords】Coral sand; Slope angle; Shaking table tests; Seismic response; Liquefaction