Load variation characteristics of cutterhead load during shield disc cutter cutting a reinforced concrete diaphragm wall
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摘要: 以苏州轨道交通8号线时代广场站盾构穿越钢筋混凝土地下连续墙工程为依托，通过数值模拟和理论分析研究滚刀切削钢筋混凝土地连墙刀具及刀盘荷载，并基于实际工程系统研究盾构推力与扭矩的变化特征。研究表明：滚刀对钢筋混凝土的破碎形式是跳跃式的，切削力曲线可分为四个阶段；盾构刀盘在切削地连墙后推力扭矩主要受推进速度的影响，并与钢筋混凝土接触面积成正比，在切墙过程中，推进速度波动较大的情况下推力扭矩会出现较大起伏；通过编制刀盘荷载计算程序，获得刀盘推力与扭矩理论值及变化规律：推力和扭矩理论值的变化趋势与切削钢筋混凝土地连墙滚刀数量变化一致。Abstract: Based on the shield tunneling through the reinforced concrete diaphragm wall at the Times Square Station of Suzhou Rail Transit Line 8, numerical simulation and theoretical analysis were carried out to investigate the cutter and cutterhead load of the disc cutter cutting the reinforced concrete diaphragm wall and the characteristics of the shield thrust and torque based on the actual engineering systems. The study revealed that the crushing form of the disc cutter on the reinforced concrete is a jumping type, and the cutting force curve can be divided into four stages. The thrust and torque of the shield cutter mainly depend on the driving speed after cutting the reinforced concrete diaphragm wall, and are proportional to the contact area with the reinforced concrete. During the cutting process, the thrust and torque will fluctuate greatly when the driving speed fluctuates significantly. By developing a cutter load calculation program, the theoretical values and variation patterns of the cutter thrust and torque were obtained, which are consistent with the change in the number of rolling cutters cutting the reinforced concrete diaphragm wall.
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Key words:
- shield tunnel /
- disc cutter /
- steel reinforced concrete /
- diaphragm wall /
- cutter load
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表 1 地连墙形式及构造
围护结构 结构形式 接头形式 混凝土强度等级 钢筋布置情况 地连墙 复合墙 锁口管 C30 底板以下4 m：外侧ϕ25@150 mm，内侧ϕ25@150 mm+ϕ28@150 mm；
底板以下4～10 m：外侧ϕ25@150 mm，内侧ϕ28@150 mm
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表 2 C30混凝土RHT模型主要参数
符号 名称 参数取值 符号 名称 参数取值 RO 物质密度 2.3 g/cm3 D1 初始损伤参数 0.04 SHERA 剪切模量 16.7 GPa D2 损伤参数 1 $ T_1$ 状态方程参数 35.27 GPa A1 雨贡纽系数 35.27 GPa A 残余应力强度参数 1.6 A2 雨贡纽系数 39.58 GPa N 残余应力强度指数 0.61 A3 雨贡纽系数 9.04 GPa FC 单轴抗压强度 0.03 GPa PEL 压缩应变率指数 0.032 $ T_{2} $ 状态方程参数 0 GPa PCO 孔隙压实时压力 6
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表 3 钢筋MAT_PLASTIC_KINEMATIC模型参数
$ \sigma_{0} $/MPa $ E $/GPa $ E_{t} $/GPa C/s-1 P 272.26 201 3.18 3299 4.815
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表 5 滚刀布置参数
i li/mm $ \alpha_{i} $/（°） i li/mm $ \alpha_{i} $/（°） 1 70 0 17 1600 0 2 160 180 18 1700 180 3 250 0 19 1800 90 4 340 180 20 1900 270 5 430 90 21 2000 0 6 520 270 22 2100 180 7 610 90 23 2200 90 8 700 270 24 2300 270 9 800 0 25 2400 0 10 900 180 26 2500 225 11 1000 90 27 2600 180 12 1100 270 28 2700 315 13 1200 0 29 2800 90 14 1300 180 30 2900 45 15 1400 90 31 3000 135 16 1500 270 32 3100 0
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