摘要
针对掘进状态下盾构机-土体相互作用问题,考虑土体流变特性,基于黏弹性理论和叠加原理,建立了盾构机-土体相互作用模型,提出了考虑盾构机结构特点,掘进速度和土体流变时效性的盾构机和周围土体间接触应力的计算方法,得到盾构机-土体接触应力与地层初始应力,开挖半径和时间成正比,与土体位移成反比。将黏弹性解与弹性解进行了对比,结果显示考虑流变作用推导的黏弹性解大于弹性解。对土体黏性系数、盾构机掘进速度和停机时间对盾构机-土体接触应力的影响规律进行了分析,结果显示盾构机-土体接触应力随着黏性系数的增大逐渐减小并趋于稳定,随掘进速度的增大逐渐减小并逼近于弹性接触应力分布曲线,随着停机时间的增加逐渐增大并逐渐达到稳定。
In order to study the interaction between the shield machine and the soil under the excavation state,the interaction model between the shield and the soil considering the rheological properties of soil was established based on the viscoelastic theory and superposition principle,and a calculation method for the contact stress between the shield machine and the soil considering the structural characteristics of the shield mechanism,the tunneling speed and the soil rheological timeliness was proposed.The viscoelastic solution was compared with the elastic solution,and the results show that the viscoelastic solution is larger than the elastic solution.The sensitivity of soil viscosity coefficient,shield tunneling speed and downtime to the contact stress between the shield and the soil was analyzed.The results show that the contact stress between shield machine and soil decreases and tends to be stable with the increase of viscosity coefficient;the contact stress decreases and approaches to the elastic contact stress distribution curve with the increase of tunneling speed;the contact stress increases and reaches stability with the increase of downtime.
作者
金慧
袁大军
金大龙
Jin Hui;Yuan Dajun;Jin Dalong(Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;Tunnel and Underground Engineering Research Center of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第S01期57-62,共6页
China Civil Engineering Journal
基金
国家自然科学基金联合基金项目(U1834208)
关键词
盾构
土体流变特性
盾构机-土体相互作用
黏弹性解
shield
soil rheology
interaction between shield machine and soil
viscoelastic solution
