【摘要】 以某大型水电站洞室群工程的地下结构模式为背景,用数值模拟方法计算了上百个算例,研究了4大岩类、4种埋深在不同侧向地应力条件下洞壁位移量的变化规律,并拟合出用多项式表达的公式,它可以预测围岩在不同条件下的位移量。在此基础上,提出了以相对位移量为围岩稳定性判据的具体数值,它可做为是否需施加长锚索加固围岩的参考依据。同时提出,在许多情况下,需在围岩近区考虑存在一个松弛开裂区,使数值分析更为接近实际。最后通过一个工程实例,模拟计算了存在松弛区时的围岩位移量。计算结果与实测结果相符良好。更多还原

【Abstract】 Based on the underground structure scheme of large houses of a hydro-electrical project,over hundred working conditions are numerically simulated. The variation law of displacement of house periphery is studied with considering four basic classes of rock masses,four different depths and different lateral initial stresses. As a stability criterion,the specific value of displacement of rock masses is presented to judge whether the long prestressed cables are needed to reinforce the rock masses. It is mentioned that a loosen-cracking zone of the side wall should be considered in many conditions,so that the numerical analysis result will be more closed to the reality. Finally,a simulating computation is made for a project. The computed displacement shows a good agreement to the monitoring result.更多还原