越岭浅埋偏压隧道支护系统承载特性分析

从地理、地形及地质等方面,剖析了西南山区浅埋偏压隧道的建造环境,针对该类隧道介质参数、荷载的多变性及其衬砌结构力学传递机制的复杂性,基于衬砌结构稳定的强度和变形控制原理,研究了应力和位移双重等效的隧道介质参数反分析模型及其优化算法,并理顺了其实施操作程序.然后提炼出偏压隧道承载结构承载特性的表征参数及非均衡性刻画指标.最后以有限元数值方法为手段,研究了某隧道浅埋偏压段支护体系的力学响应,从中总结出浅埋偏压隧道支护结构的承载特征,为类似工程设计和施工控制措施提供指导.

Analysis on Load-bearing Characteristics of Supporting System of the Servants and Shallow Tunnel under Asymmetrical Pressure

The construction environment of shallow tunnel under asymmetrical pressure of the mountains in the southwest of China was analyzed from the viewpoint of geographical,topographical and geological.According to the denaturations of medium parameter and load as well as the complexity of the mechanical transmission mechanism of the lining structure,the model of stress and displacement double equivalent back analysis for getting the parameter of tunnel medium and the optimization algorithm was studied on the basis of the strength and deformation control principle of the lining structure stability,and the implementation procedures were straightened out.Then,the characteristics of the characterization parameter and unbalanced depicting index for the supporting structure of the shallow tunnel under asymmetrical pressure were refined.In the end,the mechanical response of the supporting system was studied in the finite element numerical method,and the bearing characteristics of the support structure for the shallow tunnel under asymmetrical pressure were summarized in order to provide guidance for similar engineering in design and construction control.