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复合地层盾构刀盘掘进速率及受力特性分析
Authors
冯春
林钦栋
顾刚
颜永国
Publication date
3 December 2018
Publisher
Abstract
为探究复合地层中盾构刀盘的掘进速率及受力特性,基于连续-非连续单元法(CDEM),建立盾构-岩土体这一完整系统的数值计算模型。通过在CDEM中引入简单有限体积法、虚拟质量法、单元溶蚀算法等系列算法,实现盾构刀盘掘进全过程的三维模拟。建立5种刀盘面花岗岩占比的刀盘破岩数值模型,并对不同刀盘面花岗岩占比下的刀盘进尺、掘进速率、平均转矩、平均倾覆力矩等进行详细分析。数值模拟结果表明:1)在某一特定复合地层中掘进时,随着掘进时间增加,刀盘进尺基本呈线性增大的趋势,但进尺曲线中平缓段及速升段交替循环出现; 2)刀盘面花岗岩占比由0增大至100%,掌子面处拉伸破坏单元增加,剪切破坏单元减少,且刀盘的掘进速率呈指数衰减趋势,掘进速率降低88. 7%; 3)刀盘面花岗岩占比由0增大至100%,平均转矩值逐渐增大,增大比例为117. 5%,平均倾覆力矩值则呈现先增大后减小的趋势,且在花岗岩占比为50%时最大
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Institute Of Mechanics,Chinese Academy of Sciences
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Last time updated on 09/01/2019