摘要
Abstract
After analyzing and summarizing the limitations improved, and a new load equivalent model suitable of existed theoretical model, some existing conclusions are for reinforcement calculation of large diameter TBM＇S commencement and arrival is presented, and lateral trapezoidal load applied in improved strata is equivalent to superposition of uniformly load and triangle anti-symmetry load. Meanwhile, in order to certify the size effect of strata reinforcement, two models have been put into use for actual engineering strata reinforcement calculation, and results are used to analyze the relationships between stress, longitudinal reinforcement scopes and the diameter of TBM, and relationships have been made followed by the conclusions ： When the diameter of shield tunnel is less or equal to 10 m, the deviation of stress and longitudinal of two models are small, but as the diameter of shield tunnel is continuously increasing, the deviation of existed model is bigger, which may cause serious accidents if applied into actual engineering. So, for large diameter shield tunnel engineering, especially when the diameter is lager than 10 meters, the load equivalent model will be more scientifically and suitable for actual engineering designing, the conclusion will be more reliable. What＇s more, strata reinforcement theory presented in this paper gives a boundary for distinguishing large and small diameter TBM, and it also provides a good reference for similar problem.关键词
盾构/始发与到达/端头加同/尺寸效应/荷载等效Key words
TBM/commencement and arrival/strata reinforcement/scale effect/load equivalent model分类
交通工程
