MatDEM应用论文|基于离散元法的基岩潜山型地裂缝易发区预测
An independently developed discrete element code, MatDEM, was used to simulate buried hill-controlled earth fissures. An initial cubic discrete element method (DEM) model was obtained by considering the gravity accumulation of particles. A 2D stratigraphic model can be constructed by importing an elevation table of different strata into a cubic model. A simplified fluid-structure interaction method was then introduced to this. The model was simulated by gradually lowering the water level and then calculating the compression deformation of strata. By comparing the calculated settlement to the monitoring data, the validity and accuracy of the MatDEM model were verified. The area prone to earth fissures was predicted based on the analysis of the particle connections and horizontal displacement. The formation mechanism of the buried hill-controlled earth fissures was also explained. Thus, MatDEM is a good numerical simulation method for studying discontinuous problems, such as rock and soil cracking, and can be a new tool with which to study earth fissures. Fig. 1 Displacement in the Z-direction due to groundwater drawdown at 40 m (a) and at 80 m (b)
Fig. 2 Different water level depths
Fig. 3 Comparison of unit connection before and after
water extraction
(a) Before simulation; (b) Simulation results
Liu, Y., Zhang, D., Wang, G. et al. Discrete element method-based prediction of areas prone to buried hill-controlled earth fissures. J. Zhejiang Univ. Sci. A 20, 794–803 (2019) doi:10.1631/jzus.A1900292
