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软土地区地面出入式盾构法掘进全过程土体扰动研究
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Abstract:
地面出入式盾构法(Ground Pass Shield Tunneling Method，简称GPST)克服了传统盾构法在两端始发和接收工作井施工时对地面交通影响大等弊端，实现了地表出发和地表接收的全过程盾构施工新技术。本文通过理论和数值分析研究了软土地区地面出入式盾构法掘进全过程的土体扰动规律，尤其是不同埋深比C/D (隧道覆土深度/隧道直径)情况下盾构掘进导致的土体变形发展规律，给出了在施工时可考虑将埋深比0.3作为超浅埋施工的关键阈值，为地面出入式盾构法掘进过程中的沉降或抗浮控制措施的选取提供参考依据。
The advance of Ground Pass Shield Tunneling Method, hereinafter referred to as GPST Method, has overcome the disadvantage of constructing working shaft for shield launching and arrival which is typical for traditional tunnelling method, making an innovative tunnelling era on shield tunnelling history. In this paper, based on theoretical equation and numerical simulation, soil disturbance through GPST tunnelling process was investigated in soft area. Especially, soil deformation development caused by GPST tunnelling under different C/D condition was explored. And a key C/D threshold was suggested as 1/3 for super-shallow GPST tunnel, which also provides a sound basis for settlement/up-floating control of GPST tunnelling.
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