高水压作用下水砂耦合流失的DEM-CFD分析

戴轩; 霍海峰; 程雪松; 郭旺; 冯兴

doi:10.13204/j.gyjzG20042102

高水压作用下水砂耦合流失的DEM-CFD分析

doi: 10.13204/j.gyjzG20042102

戴轩^1,2,
霍海峰^1,2, ,,
程雪松³,
郭旺⁴,
冯兴^1,2

1. 中国民航大学机场工程研究基地, 天津 300300;
2. 中国民航大学土木与机场工程系, 天津 300300;
3. 天津大学滨海土木工程结构与安全教育部重点试验室, 天津 300072;
4. 天津市市政工程设计研究院, 天津 300392

基金项目:

国家自然科学基金青年基金项目（51808548，51808547）；天津市企业科技特派员项目（20YDTPJC00750）；机场工程研究基地开放基金项目（JCGC2019KFJJ002）。

详细信息

作者简介:
戴轩,男,1988年出生,博士,讲师。

通讯作者:
霍海峰,hhf_1117@126.com。

计量
- 文章访问数: 84
- HTML全文浏览量: 6
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2020-04-21
- 网络出版日期: 2021-03-31

DEM-CFD COUPLED ANALYSIS ON LEAKING PROCESSES OF WATER AND SAND UNDER HIGH WATER PRESSURE

DAI Xuan^1,2,
HUO Haifeng^{1,2
, ,},
CHENG Xuesong³,
GUO Wang⁴,
FENG Xing^1,2

1. Airport Engineering Research Base, Civil Aviation University of China, Tianjin 300300, China;
2. Department of Civil and Airport Engineering, Civil Aviation University of China, Tianjin 300300, China;
3. Key Laboratory of Coast Civil Structure Safety of MOE, Tianjin University, Tianjin 300072, China;
4. Tianjin Municipal Engineering Design and Research Institute, Tianjin 300392, China

摘要

摘要: 针对不同水压条件下漏水漏砂引发的灾害问题，在室内模型试验的基础上，利用离散元和计算流体力学耦合（DEM-CFD）方法进行模拟分析。基于传统重力流试验考虑流体的耦合作用建立数值分析模型，研究水土流失形态、水土流失量、土体变形、底板结构受力及土体应力的发展变化规律。研究结果表明：漏水漏砂过程中形成的土体松动椭圆区域受土体流失与流体作用共同影响；漏点附近流场存在高流速区，最终形成贯通的水力通道，高水压将增加贯通水力通道宽度。漏水量及土体顶部颗粒的迁移均存在于缓慢增加阶段和突增阶段，高水压的影响主要发生在突增阶段，且土体损失直接导致突增阶段的发生。漏水漏砂过程中底板结构的受力分为陡降阶段、缓慢下降阶段和相对稳定阶段。漏水漏砂将诱发土拱的发生，且高水压使得土拱更易发生破坏，从而引发更多土体流失。贯通水力通道形成前、后的水土流失量及高水压的影响规律不同。
- 漏水漏砂 /
- 耦合分析 /
- 工程灾害 /
- 离散元 /
- 数值模拟
Abstract: To reveal the mechanisms of hazards induced by leakage of groundwater and sand under different water pressure, DEM-CFD method was adopted to simulate leaking processes based on a laboratory model test. Considering the effect of water leakage into the traditional gravity flow test, the numerical analysis model by DEM-CFD method was built. The variations of soil and water loss patterns, loss amounts, soil deformation, forces on the bottom plate of the testing chamber and soil stress were studied. The results showed that the soil zone of loose ellipse induced by a leaking process was influenced by both the soil loss and water leakage. A fast-flowing zone existed near the leaking point, and a hydraulic channel formed with the development of the leaking process. High water pressure increased the width of hydraulic channels. The amounts of leakage flow and ground surface movement went through a slow development stage and a sudden increasement stage, the high water pressure widened hydraulic channels. The loss of water and soil occured in the stages of slow development and sudden increasement, the high water pressure mainly influenced the sudden increasement stage. Besides, soil loss led to occurrence of the sudden increasement stage directly. During the water-sand leaking process, the variation process of forces on the bottom plate of the testing chamber could be divided into three stages:the steep decreasing stage, the slow decreasing stage and the relative stability stage. The leaking process induced the occurrence of soil arches. High water pressure made the soil arch more prone to be damaged, which caused more severe soil loss. The process of soil loss and the influence of high water pressure were quite different before and after formation of hydraulic channels.
- sand-water leaking process /
- coupling analysis /
- engineering hazard /
- discrete element method /
- numerical simulation

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