【作者】 王毅； 杨建宏；

【Author】 WANG Yi;YANG Jianhong;Chengdu Engineering Corporation Limited of Powerchina;

【机构】 中国电建集团成都勘测设计院有限公司；

【摘要】 金沙江溪洛渡水电站混凝土拱坝坝高285.5m,河床坝基岩体为峨眉山玄武岩,Ⅲ₁级岩体为主,局部分布受错动带影响的Ⅲ₂级岩体,岩体声波平均速度4652m·s^-1,小于4000m·s^-1约占28%。固结灌浆处理后,坝基岩体的平均波速大于5200m·s^-1,小于4000m·s^-1的比例多在5%以下;Ⅲ₁级岩体平均波速达5300⁵500m·s^-1,波速提高约2%⁵%;Ⅲ₂级岩体平均波为4200⁴700m·s^-1,波速提高约12%¹8%;错动带平均波速3600⁴200m·s^-1,提高率在10%²8%左右;岩体的透水率均小于3Lu;钻孔变形模量平均值达到10.0¹5GPa。固结灌浆对Ⅲ₂级岩体和错动带等地质缺陷具有明显的改善作用,坝基岩体的整体性和均一性得到了有效的提高。更多还原

【Abstract】 Xiluodu hydropower station is located on the Jinshajiang River,with a 285.5m high arch dam.The bedrock of the dam foundation consists of basalt,which can be dominantly classified as Ⅲ-1 class with some local distribution of disturbed Ⅲ-2 class.The average acoustic velocity of the bedrock is originally 4652m·s^-1,with about28%being slower than 4000m?s^-1.After consolidation grouting treatment,the average velocity is greater than5200m·s^-1,with less than 5%being slower than 4000m·s^-1.After treatment,the average velocity of the Ⅲ-1 class bedrock has reached 5300⁵500m·s^-1,being increased by 2%⁵%;the Ⅲ-2 class 4200⁴700m?s^-1,being increased by 12%¹8%;the disturbed belt 3600⁴200m·s^-1,being increased by 10%²8%,respectively.The rock permeability are less than 3 Lu and the average borehole deformation modulus is 10-15 GPa.Consolidation grouting has dramatically improved the geological condition of the Ⅲ-2 class rock mass and the disturbed belt,which has effectively improved the integrity and homogeneity of the riverbed dam foundation.更多还原