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一、概 述 沅水杨五庙坝址在地质构造上位于倒转背斜南翼,岩层倾向左岸.坝基地层系古老的前震旦系板溪群轻变质的砂岩、石英岩和板岩互层.地层具有典型的类复理式构造,浅海及滨海相沉积环境特点.经多次构造运动和漫长的外营力风化作用,断层发育,软弱岩层和破碎带往往泥化,成为该坝址的主要工程问题.坝区至主要断层有NEE,NWW,NE,NW四组,顺软弱岩层发育的层间错动有F_121,F_115.f_1等. 声波法试验在15个平硐、24个钻孔中进行.共钻试验孔831个,累计进尺690米,孔深0.5～1.8米,孔径42毫米;凿制软弱结构面试点80个,声波测井2300米;凿制动静
I. Overview The Yangshenmiao dam site in Yuanshui is located in the south wing of the anticlinal anticline on the south wing of the inverted anticline, and the left bank of the strata tends to be the foundation of the dam. The dam foundation is an interbedded layer of pale metamorphic sandstone, quartzite and slate of the former Sinian Banxi group. The strata have the characteristics of typical complex-type structures, shallow sea and sedimentary environment of the coastal facies.Due to multiple tectonic movements and long external tectonic weathering, the faults are developed, the weak rock formations and crusts are often muddy, becoming the main site of the dam site Engineering problems. There are four groups of NEE, NWW, NE and NW in the dam area to the main faults, and there are F_121 and F_115.f_1 between the soft and weak rock strata. Among the 15 adit and the 24 boreholes A total of 831 total drilling test hole, cumulative footage of 690 meters, hole depth of 0.5 to 1.8 meters, a hole diameter of 42 mm; drilling weak structure of the surface test points 80, sonic logging 2300 meters;