Discrete element method-based prediction of areas prone to buried hill-controlled earth fissures
- 7 Downloads
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.
Key wordsDiscrete element method (DEM) MatDEM Buried hill Earth fissure Prone area
采用离散元法揭示抽水引起的基岩潜山型地裂缝 的发育过程, 实现对地裂缝易发区的准确预测, 为地裂缝灾害的早期预测和防治提供依据.
1. 提出采用离散元法模拟抽水引起的地裂缝问 题. 2. 提出依据颗粒连接和水平位移等预测地裂 缝的易发区.
1. 建立一个紧密堆积的二维模型. 2. 通过地调得 到的高程切割模型, 构建二维地层模型. 3. 对不同地层进行材料参数赋值, 随后施加重 力, 并对模型进行平衡. 4. 模型达到平衡后, 采 用简化的流固耦合计算方法以及通过调整单元 颗粒的浮力来模拟降水过程. 5. 通过每次运算降 低10 m 地下水位的循环算法模拟在地下水逐 渐降低过程中的地裂缝发展. 6. 通过与现场地调 数据进行对比, 验证离散元法在地裂缝模拟中的 可靠性.
1. 随着地下水位的下降, 由于不均匀沉降而产生 的土体弯曲作用是控制地裂缝发育的主要机制. 2. MatDEM 是一种更可靠、直观的数值模拟方法, 可以用于不连续地质体(如基岩潜山型)地裂缝 的易发区预测, 以及地裂缝的演化过程研究.
关键词离散元法 MatDEM 基岩潜山型地裂缝 易发区
Unable to display preview. Download preview PDF.
- Adiyaman IB, 2012. Land Subsidence and Earth Fissures Due to Groundwater Pumping. PhD Thesis, University of Arizona, Arizona, USA.Google Scholar
- Budhu M, 2011. Earth fissure formation from the mechanics of groundwater pumping. International Journal of Geomechanics, 11(1):1–11. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000060 CrossRefGoogle Scholar
- Burbey TJ, 2010. Mechanisms for earth fissure formation in heavily pumped basins. In: Land Subsidence, Associated Hazards and the Role of Natural Resources Development. IAHS-AISH Publication, Querétaro, Mexico.Google Scholar
- Demir A, Dincer AE, Bozkus Z, et al., 2019. Numerical and experimental investigation of damping in a dam-break problem with fluid-structure interaction. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 20(4):258–271. https://doi.org/10.1631/jzus.A1800520 CrossRefGoogle Scholar
- Li WT, Yang N, Li TC, et al., 2017. A new approach to simulate the supporting arch in a tunnel based on improvement of the beam element in FLAC3D. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 18(3):179–193. https://doi.org/10.1631/jzus.A1600508 MathSciNetCrossRefGoogle Scholar
- Mohseni N, Sepehr A, Hosseinzadeh SR, et al., 2017. Variations in spatial patterns of soil-vegetation properties over subsidence-related ground fissures at an arid ecotone in northeastern Iran. Environmental Earth Sciences, 76(6): 234. https://doi.org/10.1007/s12665-017-6559-z CrossRefGoogle Scholar
- Rothenburg L, Obah A, El Baruni S., (1995). Horizontal ground movements due to water abstraction and formation of earth fissures. International Association of Hydrological Sciences, Publication, 234:239–249.Google Scholar
- Wu JC, Shi XQ, Ye SJ, et al., 2010. Numerical simulation of viscoelastoplastic land subsidence due to groundwater overdrafting in Shanghai, China. Journal of Hydrologic Engineering, 15(3):223–236. https://doi.org/10.1061/(ASCE)HE.1943-5584.0000172 CrossRefGoogle Scholar
- Zhang ZH, Zhang XD, Tang Y, et al., 2018. Discrete element analysis of a cross-river tunnel under random vibration levels induced by trains operating during the flood season. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 19(5):346–366. https://doi.org/10.1631/jzus.A1700002 CrossRefGoogle Scholar