Experimental study on rock slope with weak interlayer under blasting seismic wave
Du Ruifeng1,2 Pei Xiangjun1 Jia Jun1,3 Zhang Xiaochao1 Yang Shuai1
1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;
2. Inner Mongolia Technical College of Construction, Hohhot 010070, China;3. Key Laboratory for Geo-hazards in Loess Area,
MLR/Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
Abstract： In geological engineering, in order to explore the dynamic response characteristics of the slope with weak interlayer under the blasting seismic wave, a physical simulation experiment consisting of concrete base and slope model was conducted. The blasting effect was exerted by detonator and emulsion explosive, and multiple blasting tests were carried out considering the influence of blasting holes position and explosive quantity. Fast Fourier transform (FFT) and Hilbert Huang transform (HHT) were applied to the responses of velocity and acceleration respectively. The frequency spectra were consistent with the characteristics of blasting seismic wave. The comparative analysis of velocity response in three directions at the top of slope shows that similar velocity response will result from similar blasting conditions. According to the acceleration response in two directions, the slope model is simplified as plane strain model, the difference of peak acceleration vector between hard rock and soft rock along vertical and horizontal direction is compared. It is shown that the soft rock has “energy absorption” and “shock absorption” effect, and the hard rock above the soft rock has “amplification” effect, which is quantized by the coefficient of influence of peak acceleration. Finally, the macro stress model of slope with weak interlayer under the blasting seismic wave is proposed, and the sliding mechanism of slope under the blasting seismic wave is analyzed. The experimental results not only provide a more reasonable mechanical explanation for the mechanism of landslide triggered by natural earthquake, but also provide experimental reference and reinforcement technical basis for the stability evaluation and treatment of the slope under the blasting seismic wave in the blasting operation mining area.
杜瑞锋 裴向军 贾俊 张晓超 杨帅. 含软弱夹层岩质边坡在爆破地震波下的试验研究[J]. 土木工程学报, 2021, 54(4): 95-106.
Du Ruifeng Pei Xiangjun Jia Jun Zhang Xiaochao Yang Shuai. Experimental study on rock slope with weak interlayer under blasting seismic wave. 土木工程学报, 2021, 54(4): 95-106.
