【摘要】 一般大型工程均首先考虑避开强震区,因而对强震区内岩体破坏的研究较少。大柳树坝址位于VIII级潜在震源区,岩体受到多次历史地震的破坏,其特征与一般岩体有明显区别,为松动岩体。岩体弹性波速度是组成岩体的岩石性质、岩体结构、赋存环境的综合反映。针对大柳树坝址进行了大量的现场波速测试,其中洞壁波速测试261段,洞间穿透波速65个扇面,CT穿透波速6个剖面。与其他坝址对比发现,大柳树坝址岩体波速明显偏低,整体上与其他坝址风化带或断层带波速相当,而且其洞壁波速、洞间岩体穿透波速、洞间岩体CT穿透波速均无明显差别,这是松动岩体波速特有的特征。通过岩体弹性波速与岩体基本质量评分BQ的比较发现,二者有良好的线性关系,波速反映了测试范围内的岩体质量。更多还原

【Abstract】 As a rule,it is prior for large-scale projects to avoid strong earthquake areas.Thus there are little researches on the failure condition of rock mass in strong earthquake areas.The Daliushu dam is locates in the VIII potential seismic region,where the rock mass has been damaged by earthquake many times in history.Different from the general rock mass,it is characterized by dynamo-relaxed rock mass.Rock mass elastic wave velocity is the synthesized reflection of rock quality,rock mass structure,and rock mass existing environment.Quantities of in-situ wave velocity tests have been carried out at the site of Daliushu dam,among which cave wall wave velocity tests on 261 segments,in-between caves rock mass penetrating wave velocity tests on 65 fans,and in-between caves rock mass CT penetrating wave velocity tests on 6 sections.Compared with other dam sites,it is found that the wave velocity of rock mass at the site of Daliushu dam is obviously low,and it is generally equivalent to the wave velocity of weathered strip and faultage of other dam sites.What′s more,its cave wall wave velocity,the in-between caves rock mass penetrating wave velocity,and the in-between caves rock mass CT penetrating wave velocity have no distinctive difference,which is the specific characteristic of dynamo-relaxed rock mass.Comparison between rock mass elastic wave velocity and rock mass basic quality evaluation BQ shows that there′s a good linear relation between them.The wave velocity reflects the rock mass quality in the tested area.更多还原