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一、立项背景至2015年底我国已建和在建地铁的城市已达39座,其中10余座滨海(江)城市以软土地层为代表,近10座滨河城市局部覆盖软土,故大量地铁盾构隧道在软土中修建。通过软土地区20余年地铁盾构法修建技术发展,现有技术能达到盾构隧道轴线偏差在±10cm内、隧道椭圆度在±6‰以内。但近期开建的宁波等地,地层埋深更深厚、承载力更低、含水量更高、压缩性更大且灵敏性更强,若直接运用现有技术会遭
I. Project Background By the end of 2015, China has built 39 cities under construction and subway under construction. Among them, more than 10 coastal (Jiang) cities are represented by soft earth formations and nearly 10 riverside cities are partially covered with soft soil. Therefore, a large number of subways Shield tunnel built in soft soil. Through more than 20 years of subway shield construction in soft soil areas, the existing technology can achieve a shield tunnel axis deviation within ± 10cm and a tunnel ovality within ± 6% o. However, recently opened in Ningbo and other places, deeper stratigraphic depth, lower bearing capacity, higher water content, more compressive and more sensitive, if the direct use of existing technology will be