某岩体的岩石单轴饱和抗压强度为10MPa，岩体波速Vpm＝4km/s，岩块波速Vpr＝5.2km/s，如不考虑地下水，软弱结构面及初始应力影响，试计算岩体基本质量指标BQ值和判断基本质量级别。
参考答案：
根据《工程岩体分级标准》(GB 50128—1994)，岩体基本质量指标BQ，应根据分级因素的定量指标Rc的兆帕数和Kv计算。
BQ＝90+3Rc+250Kv
Rc＝10MPa
90Kv+30＝90×0.59+30＝83.1MPa，Rc＝10MPa＜83.1MPa
0.04Rc+0.4＝0.04×10+0.4＝0.8，Kv＝0.59＜0.8
BQ＝90+3×10+250×0.59＝267.5，基本质量级别属IV级。
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