大断面组合式顶管机掘进排渣离散元仿真
DEM Simulation of Excavation and Muck Discharge of a Combined Pipe-Jacking Machine with a Large Section
谢军 1吕庆龙 2张海山 2张宏伟 1张润麒 3苏栋4
作者信息
- 1. 中电建南方建设投资有限公司,深圳 518052
- 2. 中国水利水电第十一工程局有限公司,郑州 450001
- 3. 深圳大学土木与交通工程学院,深圳 518060
- 4. 深圳大学土木与交通工程学院,深圳 518060;滨海城市韧性基础设施教育部重点实验室(深圳大学),深圳 518060;深圳市地铁地下车站绿色高效智能建造重点实验室,深圳 518060
- 折叠
摘要
顶管法已在地下工程中广泛应用,但对新型超大断面组合式顶管机掘进排渣过程中土体的运动和力学响应仍缺乏研究.建立了世界最大断面组合式顶管机的等尺寸模型,利用离散元法模拟顶管机的掘进排渣过程,研究排渣速度对土体运动行为和力学响应的影响.模拟结果表明,最佳的掘进-排渣速度比约为0.6 cm/rev,土仓流动性受上下两个半截面底部两侧刀盘的影响,滞排时土压随掘进累积增大,存在地表隆起倾向;超排时土压小于静止土压力,上覆土体随掘进由局部破坏发展为整体破坏.
Abstract
The method of pipe jacking has been widely used in underground engineering.However,the research regarding the dy-namics and mechanical responses of soil during the excavation process of the innovative combined pipe-jacking machine with a large section is still insufficient.A full-scale model of the combined pipe-jacking machine with the largest section in the world thus far was established.The excavation and discharge process of the machine was modeled using DEM(discrete element method),and the effects of discharge rates on the dynamics and responses of soil were analyzed.The results show that the optimal ratio of advance-discharge rate is approximately 0.6 cm/rev.The fluidity of soil is primarily influenced by the two cutterheads located at the bottom of both half sec-tions.In the case of excess-discharge,the soil pressure of the stratum cumulatively increases,and the ground surface is prone to ris-ing.In contrast,in the case of excess-discharge,the soil pressure is less than the static pressure,and a local failure of the covering stratum is formed,and then develops into a complete failure as the machine advances.
关键词
组合式顶管/大断面/排渣/土体流动性/离散元法Key words
combined pipe-jacking machine/large section/muck discharge/soil fluidity/discrete element method(DEM)引用本文复制引用
基金项目
广东省重点领域研发计划(2019B111105001)
国家自然科学基金(52278364)
深圳市高等院校稳定支持计划(20220808143139001)
出版年
2024
NETL
NSTL
万方数据