4.岩石质量指标（RQD）大于________可认为岩石为优质。

A.95%                                                                         B.90%

C.85%                                                                         D.80%

5.影响隧道围岩稳定性的地质因素有

A.围岩的初始应力场                                               B.施工方法

C.埋深                                                                         D.隧道形状和尺寸

6.我国道路隧道衬砌计算多数仍采用

A.收敛-约束法                                                           B.复合整体法

C.荷载-结构模型分析法                                          D.纯经验法

7.新奥法提出围岩体和支护视作统一的承载结构体系，________是主要的承载单元。

A.锚杆                                                                         B.喷射混凝土

C.岩体                                                                         D.衬砌

8.下列哪种不是膨胀土围岩对隧道施工的危害

A.隧道坍塌                                                                B.围岩裂缝

C.坑道下沉                                                                D.流石流泥

9.光面爆破首先起爆的是

A.底板眼                                                                    B.周边眼

C.辅助眼                      &