大断面软弱围岩隧道开挖支护模拟分析

结合广深港客运专线ZH-2标百足地隧道的施工实例,采用数值模拟分析的研究方法,对大断面软弱围岩隧道开挖支护情况进行了施工过程的研究。主要对三台阶典型开挖步骤的变化情况进行了数值模拟,研究了开挖对洞周围岩压力、初期支护的内力、洞内水平收敛及拱顶下沉的影响。通过对隧道开挖和支护施工过程的数值模拟来分析施工中初支内力、拱顶沉降以及隧道收敛在各施工阶段的变化情况,以便在施工中结合监控量测数值来指导施工。

Numerical Analysis of Excavation and Supporting for Large-section Tunnel in Weak Rocks

The article, taking Baizudi Tunnel of passenger special line from Guangzhou to Hong Kong via Shenzhen as an example, studies the construction process of large-section tunnel surrounding with weak rocks with numerical simulation method with focusing on the changes of typical excavation steps in three-step. The impact of excavation on rock pressure, the internal forces of initial support, horizontal convergence inside and arch settlement are researched to analyze the changes of the internal forces of initial support, arch settlement and convergence in the construction process, so as to direct con- struction combined with monitoring values.