基于接触应力反分析的隧道初期支护结构内力研究  

Back analysis of internal force of initial support in tunnel based on touch stress

作　　者：文竞舟[1,2] 张永兴[1,2] 王成[3] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学 山城镇建设与新技术教育部重点实验室,重庆400045 [3]重庆交通大学隧道及岩土工程系,重庆400074

出　　处：《岩土力学》2011年第8期2467-2472,共6页Rock and Soil Mechanics

基　　金：国家杰出青年科学基金项目(No.50625824);黔科合重大专项(No.[2008]6018)

摘　　要：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。Using monitoring data to analyze and evaluate internal force of supporting structure is an important problem in dynamic design and construction of tunnel, which has great significance for construction safety. According to the characteristics of shotcrete layer in initial support and the theory of circular beam on elastic foundation, based on touch stresses between shotcrete layer and surrounding rock, the analytical solution of internal force is deduced. The stress concentration position is obtained, which is convenient to make relative safety countermeasures in the following construction. The analysis of tunnel project excavated by bench method shows that the analytical expression of solving internal force based on touch stresses is a new and effective way, so as to provide a more reliable basis for the safety assessment of tunnel structures.

关 键 词：公路隧道 监控量测 喷射混凝土 接触应力 弹性地基曲梁 

分 类 号：U451[建筑科学—桥梁与隧道工程]