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基于离散元法对高陡岩石边坡爆炸源激发地震波传播特性的研究

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论文题目

Investigation on the SeismicWave Propagation Characteristics

Excited by Explosion Source in High-Steep Rock Slope Site Using Discrete Element Method

Danqing Song ^1,2, Xuerui Quan ³, Mengxin Liu ^4,* , Chun Liu ^3,*,Weihua Liu ⁵,

Xiaoyu Wang ⁴and Dechao Han ⁵

1 School of Civil Engineering and Transportation, South China University of Technology,Guangzhou 510640, China

2 State Key Laboratory of Subtropical Building Science, South China University of Technology,

Guangzhou 510640, China

3 School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;

4 School of Civil Engineering, Northeast Forestry University, Harbin 150040, China;

5 SINOPEC Key Laboratory of Geophysics, Nanjing 211103, China;

* Correspondence: liumengxin@nefu.edu.cn (M.L.); chunliu@nju.edu.cn (C.L.)

研究内容

Abstract: The influence of seismic waves induced by explosion sources on the dynamic response characteristics of rock slope sites is one of the most important problems affecting engineering construction. To investigate the wave propagation characteristics and attenuation law of seismic waves induced by explosive sources in rock sites from the perspective of time and frequency domains, the high-performance matrix discrete element method (MatDEM) is used to carry out numerical simulation tests on a granite rock medium site. The discrete element model of the high-steep rock slope is established by MatDEM, and the dynamic analysis of the rock medium site is conducted by loading blasting vibration load to generate seismic waves. The results show that the seismic waves in the rock site present characteristics of arc propagation attenuation. The maximum attenuation rate of the dynamic response is the fastest within 0.3 s and 25 m from the explosion source. The slope region can weaken the dynamic response of seismic waves generated by the explosion source. In particular, the high-frequency band (>20 Hz) has an obvious filtering effect. The dynamic response of the P-wave induced by the explosive source is greater than that of the S-wave in the bedrock and surface region. The dynamic amplification effect of the P-wave is greater than that of the S-wave in the slope region. The seismic waves in the slope region show an attenuation effect along the slope surface and have a typical elevation amplification effect inside the slope.

Keywords: seismic wave characteristics; attenuation law; explosion source; time and frequency domains; rock slope site

FIGURE 4 DEM model.

FIGURE 6 Distribution characteristics of wavelet displacement field of explosion sour.

FIGURE 16 Fourier spectrum of horizontal acceleration wavelet excitation from the explosion source.

FIGURE 18 The ratio of PFSAx to PFSAz in the DEM model.

了解详情

Song, D.; Quan, X.; Liu, M.; Liu, C.; Liu, W.; Wang, X.; Han, D. Investigation on the Seismic Wave Propagation Characteristics Excited by Explosion Source in High-Steep Rock Slope Site Using Discrete Element Method. Sustainability 2022, 14, 17028.

来源：矩阵离散元MatDEM

ACT UM 离散元爆炸 FAST InVEST

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首次发布时间：2023-12-30