基于Hoek-Brown准则的水下隧道近接施工影响区划研究
Analysis of influence zone division of adjacent construction of underwater tunnel based on Hoek-Brown criterion

基于水下隧道近接施工影响问题相比普通隧道更为复杂，而隧道近接施工影响区划的经验法具有较大的不确定性，如何根据理论计算准确确定影响区划对于实际施工与设计有重大意义。基于岩体Hoek-Brown非线性屈服准则，考虑渗流因素，通过弹塑性理论推导得到水下隧道近接施工周围岩体应力状态，结合“松动区-承载区”概念，提出定义水下隧道近接施工影响区划方法，并通过工程实例应用进行分析，以数值模拟结果对比计算结果。研究结果表明：通过推导提出的理论公式能够通过编制的计算程序得到水下隧道近接施工时强影响区、弱影响区、无影响区的分界点，应用于实际工程中可为隧道支护设计与建设施工提供一定指导意义。
Compared with normal tunnels, the problem of the adjacent construction of the underwater tunnel is more complicated. The empirical method of influence zone division of adjacent tunnel construction has great uncertainty so far, thus it’s meaningful for construction and design of tunnels to calculate the influence zone accurately and theoretically. Based on Hoek-Brown nonlinear yield criterion, considering the factor of seepage water, the stress state of surrounding rock and soil of underwater tunnel is calculated through elastic-plastic theory, furthermore the influence zone division method of adjacent construction of underwater tunnels is proposed, and combined with one engineering project, the calculation results are applied and compared by numerical simulation test. The conclusions show that: the derived calculation formula can be used to get demarcation radius among strong influence zone, weak influence zone and non-influence zone of adjacent construction of underwater tunnel by using the computer program. The conclusions can be applied to guiding the underwater tunnel supporting design and construction