水布垭马崖高边坡岩体波速分带及卸荷带质量评价

Rock Wave Velocity Zoning and Quality Assessment on Unloaded Zones of Shuibuya Project's Maya High Slope

根据弹性波浅层地震反射及折射法测试成果，对清江水布垭马崖自然高边坡砂、灰岩岩体按相对低速、波速过渡、波速稳定进行了波速分带以及相应各带岩体的弹性模量Ｅｅｌａ、变形模量Ｅｄｅｆ的指标推算。得到马崖边坡岩体相对低速带一般约４０～６０ｍ，其Ｅｅｌａ范围值８．７～１７．９ＧＰａ，均值１２．５ＧＰａ；Ｅｄｅｆ范围值５．４～１１．８ＧＰａ，均值８．０ＧＰａ。低速带内０～４０ｍ段为卸荷裂隙密集、风化作用明显的区段。深入岩体６０ｍ到过渡或稳定带。６０ｍ后基本为微新岩体范围。依据测试结果对边坡卸荷带岩体质量给予了初步评价，卸荷带内岩体级别一般为Ⅳ以上或Ⅲ以下，未卸荷带岩体一般Ⅱ级或Ⅲ以上，两者相差１～２级。

Using elastic wave shallow seismic reflection and refraction method,the malmstone and limestone of Maya high slope of the Shuibuya Project were studied.According to the results of relative low,transtive and stable velocities,the rock zoning,the elastic module E ela and deformation module E def were given.The extent of the relative low wave velocity zone is 40-60m,the E ela form 8.7 to 17.9GPa,average 12.5 GPa and the E def from 5.4 to 11.8GPa,average 8.0GPa.Over 60m,the rock are transitive and stable wave velocity zones;the low wave velocity zone (0-40m) is unload cracking and weathering section.The section over 60m is light fresh rock.In addition unload rock qualities are preliminarily evaluated according to the test results .It is concluded that the unload rock usually is of magnitude Ⅳ up or Ⅲ down,the load rock Ⅱor Ⅲ up, difference between them Ⅰ～Ⅱ.