埋地管线破损-漏土诱发地面塌陷过程的流固耦合离散元模拟
Fluid-structure coupled discrete element simulation of ground collapse induced by underground pipeline damage and soil leakage
姬建 1闫亚东 2王涛 2袁雪阳2
作者信息
- 1. 河海大学土木与交通学院,江苏南京 210098;岩土力学与堤坝工程教育部重点实验室(河海大学),江苏南京 210098
- 2. 河海大学土木与交通学院,江苏南京 210098
- 折叠
摘要
为了探究埋地管线破损-漏土诱发地面塌陷的规律,采用DEM-CFD方法,综合考虑管线埋深、水压和破损口半径等因素,对单一砂土层和上覆黏土层两种工况的地面塌陷过程进行了数值模拟分析.结果表明:颗粒损失率和地面沉降值呈正相关关系;根据颗粒损失速率,塌陷过程可划分为颗粒运移、快速损失和沉降槽缓慢扩展3个阶段;水压是影响颗粒损失速率的主要因素;对于单一砂土层,随着水压、破损口半径的增大和管线埋深的减小,颗粒损失率逐渐增大;对于上覆黏土层,由于颗粒的黏结作用,颗粒运移阶段持续时间与上覆黏土层厚度呈正相关关系,与水压、破损口半径呈负相关关系.
Abstract
In order to investigate the underlying mechanism of ground collapse resulting from pipeline damage and soil leakage,a comprehensive analysis was conducted using the DEM-CFD method.This study considered various factors of ground collapse,including the pipeline burial depth,water pressure,and radius of damage openings,while examining two distinct working conditions,a single layer of sand and an overlying layer of clay.The obtained results reveal a clear positive correlation between the particle loss rate and the magnitude of ground settlement.The collapse process can be delineated into three distinct stages based on the particle loss rate that are particle migration,rapid loss,and gradual expansion of the settlement trough.Among the considered factors,water pressure emerged as the primary influencer of the particle loss rate.In the case of a single sandy soil layer,the particle loss rate demonstrates an increasing trend with higher water pressure,larger damage radius,and shallower burial depth.For the overlying clay layer,the duration of the particle migration phase positively correlates with the thickness of the overlying clay layer,while displaying a negative correlation with water pressure and damage opening radius.
关键词
地面塌陷/管线破损/颗粒损失/离散元/流固耦合Key words
ground collapse/pipeline damage/particle loss/DEM/fluid-structure coupling引用本文复制引用
基金项目
国家自然科学基金项目(U22A20594)
国家自然科学基金项目(52079045)
出版年
2024
国家科技期刊平台
NSTL
万方数据