侧压系数及回填材料对双护盾TBM卡机控制的影响分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Impact of Lateral Pressure Coefficient and Parameters of Backfilling Material on DS-TBM Jamming Control

Author(s):: Winson; Jia Shuyao; Gao Xingpu; Institute of Geotechnical and Rail Transit Engineering, Henan University

Keywords:: Double shield TBM; card machine control; side pressure coefficient; Modulus of elasticity of the backfill material; soft fill length

摘要:: 为研究深部挤压地层侧压系数λ、回填材料弹性模量Ｅ、软填充长度Ｌ_r对双护盾TBM卡机控制的影响，采用3DEC建立了TBM与围岩相互作用模型。数值计算中采用了改进的 Burgers（CVISC）黏弹塑性蠕变本构，模拟了TBM动态分步开挖，结果表明：(1)λ 越大，对TBM卡机控制越不利：当λ≤１时，其影响程度较小；当１＜λ≤1.2时，其影响程度逐渐增大；当λ≥1.2时，TBM的总阻力急剧上升，对卡机控制极为不利；(2)回填材料E越大，TBM的总接触压力和总阻力越小，对TBM卡机控制越有利。；(3)Lr越大TBM总阻力越大,TBM的卡机概率也越大；TBM掘进中，为了降低卡机概率应尽量缩短软填充阶段的长度。

Abstract:: In order to study the effects of lateral pressure coefficient λ, elastic modulus E of backfill material, and soft filling length Lr on the jamming control of double-shield TBM in deep squeeze formation, the interaction model between TBM and surrounding rock was established by using 3DEC. In the numerical calculation, the improved Burgers (CVISC) viscoelastic-plastic creep constitutive was used to simulate the dynamic step-by-step excavation of the TBM. The results showed that: (1) The larger the λ, the more unfavorable the TBM jamming control: when λ≤1 When λ≥1.2, the degree of influence is small; when 1<λ≤1.2, the degree of influence gradually increases; when λ≥1.2, the total resistance of the TBM rises sharply, which is extremely unfavorable to the control of the jamming machine; (2) The larger the backfill material E, the smaller the total contact pressure and total resistance of the TBM, which is more beneficial to the control of TBM jamming; (3) The larger L r is , the greater the total resistance of the TBM is, and the greater the probability of TBM jamming is; , in order to reduce the probability of jamming, the length of the soft filling stage should be shortened as much as possible.