摘要:
软硬不均地层是盾构施工过程中常遇到的不良地质之一，盾构机在掘进软硬不均地层时，刀盘受力不均易导致盾构机姿态发生变化，从而导致盾构隧道偏离设计轴线。为研究盾构机掘进软硬不均地层时，刀盘受力和盾构机姿态变化之间的关系，设计了1:10的模型盾构开挖施工模型试验，对试验中软硬不均地层中盾构机受力状况进行了分析，并对试验施工过程中盾构机的姿态进行了监测和分析。试验结果分析得出：（1）盾构机在开挖软硬不均地层时，刀盘掘进硬土层时开挖面土体反力大于刀盘掘进软土层时开挖面土体反力，刀盘将受到额外的开挖面扭矩，从而导致盾构机刀盘扭矩增大。（2）盾构法施工上软下硬地层时，盾构机刀盘逆时针转动，刀盘右侧接触硬土面积分别大于、小于、等于左侧时，盾构机刀盘受到开挖面反力整体合力分别向左下、左上、左；盾构机刀盘顺时针转动时，受力方向相反。（3）盾构机在开挖软硬不均地层时，刀盘转向应频繁规律的改变，正反转交替掘进。（4）盾构机在地层中的姿态变化受本身固有姿态和盾构机受力的综合影响。
Abstract:
The soft and hard uneven stratum is one of the bad geology often encountered in the process of shield construction. When the shield machine is excavating the soft and hard uneven stratum, the uneven force of the cutterhead can easily lead to the change of the attitude of the shield machine, which leads to the deviation of the shield tunnel from the design axis. In order to study the relationship between the force of the cutterhead and the attitude change of the shield machine when the shield machine is tunneling in the soft and hard uneven strata, a 1 : 10 model shield excavation construction model test was designed. The force condition of the shield machine in the soft and hard uneven strata was analyzed, and the attitude of the shield machine during the test construction was monitored and analyzed. The analysis of the test results shows that : ( 1 ) When the shield machine excavates the soft and hard uneven stratum, the soil reaction force of the excavation surface when the cutter head excavates the hard soil layer is greater than the soil reaction force of the excavation surface when the cutter head excavates the soft soil layer, and the cutter head will be subjected to additional excavation surface torque, which leads to the increase of the cutter head torque of the shield machine. ( 2 ) When the shield method is used to construct the upper soft and lower hard strata, the cutterhead of the shield machine rotates counterclockwise. When the contact hard soil area on the right side of the cutterhead is greater than, less than or equal to the left side, the cutterhead of the shield machine is subjected to the overall resultant force of the excavation face reaction force to the lower left, upper left and left respectively. When the cutterhead of the shield machine rotates clockwise, the force direction is opposite. ( 3 ) When the shield machine excavates the soft and hard uneven strata, the cutterhead should be changed frequently, and the positive and negative rotations are alternately excavated. ( 4 ) The attitude change of the shield machine in the stratum is affected by its inherent attitude and the force of the shield machine.
百度学术
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