Full Text:   <346>

Summary:  <149>

CLC number: P642.26

On-line Access: 2019-10-08

Received: 2019-06-27

Revision Accepted: 2019-09-03

Crosschecked: 2019-09-10

Cited: 0

Clicked: 484

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Yang Liu

https://orcid.org/0000-0001-7147-7584

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.10 P.794-803

10.1631/jzus.A1900292


Discrete element method-based prediction of areas prone to buried hill-controlled earth fissures


Author(s):  Yang Liu, Dan Zhang, Guang-ya Wang, Chun Liu, Yan Zhang

Affiliation(s):  School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China; more

Corresponding email(s):   zhangdan@nju.edu.cn

Key Words:  Discrete element method (DEM), MatDEM, Buried hill, Earth fissure, Prone area


Yang Liu, Dan Zhang, Guang-ya Wang, Chun Liu, Yan Zhang. Discrete element method-based prediction of areas prone to buried hill-controlled earth fissures[J]. Journal of Zhejiang University Science A, 2019, 20(10): 794-803.

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author="Yang Liu, Dan Zhang, Guang-ya Wang, Chun Liu, Yan Zhang",
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pages="794-803",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900292"
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T1 - Discrete element method-based prediction of areas prone to buried hill-controlled earth fissures
A1 - Yang Liu
A1 - Dan Zhang
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DOI - 10.1631/jzus.A1900292


Abstract: 
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.

Very good paper, modelling was validated using real data.

基于离散元法的基岩潜山型地裂缝易发区预测

目的: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.
创新点: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.
方法: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.
结论: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

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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