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软弱破碎地层全浅埋大跨度大断面双连拱城市隧道施工难度较大,施工中应尽量避免扰动围岩,修建中应做到不塌、不裂、不渗。如果施工工艺不良或违反了施工力学原理,可能产生一系列问题。所以,研究和评价隧道在全浅埋和大跨度大断面条件下的施工控制,对不良施工导致的问题做出评价和决断,并及时反馈到施工中,进而改造和优化施工工艺具有重要意义。
It is difficult to construct tunnels in the fully-shallow large-span and double-arch urban tunnels with weak and broken formations. During the construction, the surrounding rock should be avoided as far as possible. During construction, the tunnels should not collapse, crack or infiltrate. If the construction process is not good or violates the principle of construction mechanics, may produce a series of problems. Therefore, it is of great significance to study and evaluate the construction control of the tunnel under the conditions of full-depth and long-span large-section, evaluate and decide the problems caused by the bad construction, and timely feedback it to the construction so as to reform and optimize the construction technology.