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盾构隧道开挖面支护压力的确定一直是隧道工程界普遍关注的核心问题之一。对开挖面支护压力计算的6种模型进行深入的讨论,并在此基础上,针对黏性土地层的特点,修正著名的Horn筒仓模型,推导考虑土拱效应的黏性土开挖面支护压力计算公式。以钱江隧道工程为背景,详细分析开挖面支护压力7种确定方法的计算结果,论证各计算方法的工程实用性,并对计算参数的选取进行讨论,为类似工程提供重要的建议值。
The determination of shield support surface excavation pressure has always been one of the core issues of common concern in tunnel engineering. Based on the above discussion, six models of pressure calculation for supporting face excavation are discussed in depth. Based on the characteristics of cohesive soil formations, the famous Horn silo model is modified and the clay excavation considering soil arching effect is deduced Surface support pressure calculation formula. Based on the project of Qianjiang tunnel, the calculation results of seven kinds of determination methods of supporting pressure on excavation face are analyzed in detail, and the engineering practicability of each calculation method is demonstrated. The selection of calculation parameters is discussed to provide important suggestions for similar projects .