Zhu Xiang, Ma Shi-Ju, Hong Kai-Rong, Ding Yong-Gang
Department of Engineering, Huanghe Science and Technology College, Zhengzhou, 450000, China.
School of Civil Engineering, Henan University of Technology, Zhengzhou, 450001, Henan, China.
Sci Rep. 2024 Sep 27;14(1):22379. doi: 10.1038/s41598-024-72902-1.
The effects on the upper masonry structure and the construction parameters of shield cutting piles were studied during shield construction, focusing on a shield interval of Zhengzhou Metro Line 5. The study utilized the actual engineering case of left and right double-lane shields superimposed on cutting cement soil group pile composite foundations beneath masonry structures. Findings revealed that masonry structures within approximately 30 m (5.0 times the tunnel diameter) were impacted before and after shield cut pile construction, resulting in deflection and twisting deformations of houses along the central axes of the left and right tunnel lines. Implementation of "clay shock" grouting outside the shield shell, radial grouting through small conduits, shield tail synchronous grouting, and secondary reinforcement grouting effectively mitigated the disturbance caused by shield construction to the ground. When shield cut piles passed beneath masonry structures, pressure on the soil chamber, total thrust, and cutterhead speed were consistently controlled. Furthermore, the cutterhead torque was appropriately reduced, and slurry injection volume increased, contributing to better control of house settlement.
以郑州地铁5号线某盾构区间为工程背景，研究盾构施工过程中对上覆砌体结构及盾构切削桩施工参数的影响。研究采用砌体结构下左右双线盾构叠加切削水泥土群桩复合地基的实际工程案例。研究发现，盾构切削桩施工前后，约30m（5.0倍隧道直径）范围内的砌体结构受到影响，导致房屋沿左右隧道中心线发生挠曲和扭转变形。在盾壳外实施“黏土冲击”注浆、通过小导管径向注浆、盾尾同步注浆及二次补强注浆，有效减轻了盾构施工对地面的扰动。当盾构切削桩从砌体结构下方通过时，始终控制土舱压力、总推力和刀盘转速。此外，适当降低刀盘扭矩，增加注浆量，有助于更好地控制房屋沉降。
