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利用现场监控量测的数据及时分析和评价支护结构的内力是隧道动态设计和施工的关键问题,对保证隧道施工的安全具有重要意义。根据初期支护中喷射混凝土自身特点,将喷层结构视为弹性地基曲梁,并运用弹性地基曲梁理论,通过喷射混凝土与围岩接触应力推求喷层结构内力的解析解,从而得到喷层结构的应力集中部位,方便后续制定施工安全措施。经台阶法开挖的隧道工程实例分析表明,从喷层与围岩接触应力出发来求解喷层结构内力解析式是隧道内力分析一种新的有效方法,为隧道结构的安全评估提供比较可靠的依据。
It is of vital importance to ensure the safety of tunnel construction by analyzing and evaluating the internal forces of the supporting structure in time with the data from on-site monitoring and measuring, which is the key issue in dynamic design and construction of the tunnel. According to the characteristics of sprayed concrete in initial support, the sprayed structure is regarded as the curved member of elastic foundation and the analytical solution of the internal force of sprayed structure is obtained by the contact stress between sprayed concrete and surrounding rock using elastic foundation curved beam theory, Structure of the stress concentration site to facilitate the subsequent development of construction safety measures. The analysis of the tunneling projects by the step method shows that the analytical solution of the internal force of the sprayed layer based on the contact stress between the sprayed layer and the surrounding rock is a new and effective method for tunnel internal force analysis and provides a reliable method for the safety assessment of the tunnel structure in accordance with.