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基于水荷载的面力和体力作用理论,建立轴对称计算模型,推导了考虑混凝土开裂特征与围岩开挖松动圈影响的相关计算公式,并编制了对应的计算程序,在此基础上实现了基于通用有限元计算平台的透水衬砌计算仿真分析.计算结果表明:采用体力理论时,钢筋应力和裂缝宽度均明显小于面力理论,围岩承担了绝大部分的水压力,充分体现了围岩是隧洞内水压力承载主体的设计理念,对于隧洞局部围岩条件较差区域仅通过增大钢筋用量不能有效控制隧洞的渗透流量,建议对衬砌外围软弱岩体进行局部置换.
Based on the theory of surface force and physical force of water load, an axisymmetric calculation model is established, and the relevant calculation formula which takes into account the cracking characteristics of concrete and the influence of loose ring of surrounding rock excavation is deduced. Corresponding calculation programs are compiled, and on this basis, Based on the finite element calculation platform, the calculation and analysis of pervious lining is carried out. The calculation results show that the stress and crack width of the reinforced bar are obviously less than those of the facial force theory, and the surrounding rock is responsible for most of the water pressure, Is the design principle of water pressure bearing body in the tunnel. For the tunnel with poor surrounding rock conditions, it is not possible to effectively control the permeable flux of the tunnel just by increasing the amount of steel. It is suggested to partially replace the weak rock mass around the lining.