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在隧道和地下工程弹性问题的位移反分析中,当基本未知数多于三个时,在各参数可能的变化范围内找到一组使误差最小的最佳参数的优化反分析方法是当前岩土工程反分析研究的热点问题。论文结合一种新型的优化算法(差异进化算法),依托摩天岭1#斜井隧道工程施工,跟踪施工进行了典型断面围岩位移监测,以现场量测位移作为基础信息求得了斜井隧道全局最优值的最佳力学参数组合。根据以上采用差异进化算法求得的反演参数,对摩天岭1#斜井隧道单层衬砌支护稳定性进行了三维数值模拟分析,分析表明,摩天岭1#斜井隧道III级围岩段喷15 cm厚钢纤维混凝土支护后,斜井隧道围岩最小应力明显降低,围岩位移明显减小,因此建议摩天岭1#斜井洞身段III级采用15 cm厚度的钢纤维喷射混凝土单层衬砌。以上研究直接指导了摩天岭隧道单层衬砌设计和施工。
In the back-analysis of displacement of tunnels and underground projects, when the number of basic unknowns is more than three, a set of optimal inverse analysis method to find the best parameter with the smallest error within the possible variation range of each parameter is the current geotechnical engineering Anti-analysis of the hot issues. In this paper, a new optimization algorithm (differential evolution algorithm) is used to monitor the displacement of surrounding rock of a typical section with the construction and tracking of 1 # inclined shaft in Motianling. Based on the measured displacement in site, the global Optimal combination of the best mechanical parameters. Based on the above inversion parameters obtained by the differential evolution algorithm, the three-dimensional numerical simulation of the stability of the single-layer lining support in 1 # inclined shaft tunnel in Motian Ridge is carried out. The analysis shows that the grade III surrounding rock section After spraying 15 cm thick steel fiber reinforced concrete support, the minimum stress of surrounding rock of inclined shaft tunnel obviously decreases and the displacement of surrounding rock decreases obviously. Therefore, it is suggested that the 15 cm thick steel fiber shotcrete Layer lining. The above research directly guides the design and construction of the single-layer lining of the Motianling Tunnel.