论文部分内容阅读
按岩石质量指标RQD值对隧道围岩分类已被纳入《公路隧道设计规范》（JTJ026－90）。测取RQD值可采取直接钻探法，也可用结构面网络模拟法。复杂多变的岩石结构使得RQD值在不同方向上有较大差异，直接钻探法测得的RQD值有较大的离散性，甚至不反映围岩结构的真实状况。用引入微小间距效应概念的间距法实地钻探与结构面网络模拟法相结合获取RQD值较为准确、引入岩石质量百分比RQP和岩石质量风险RQR使得按RQD值预测隧道围岩类别更加符合实际。
Classification of surrounding rock by rock mass index RQD has been incorporated into the Code for Design of Highway Tunnels (JTJ026-90). RQD value can be measured by direct drilling method can also be used to simulate the surface network. The complicated and changeable rock structure makes the RQD value have big differences in different directions, and the RQD value measured by the direct drilling method has a greater discreteness, and does not even reflect the real condition of the surrounding rock structure. The RQD value obtained by the combination of the interval drilling method and the structural plane network simulation method, which introduces the concept of fine pitch effect, is more accurate. The introduction of rock mass percentage RQP and rock mass quality RQR makes it more realistic to predict the rock mass classification by RQD.