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汾河二库初步设计确定的大坝建基面高程为827．70m，在上覆26～28m厚的砂砾石层被挖除后，通过探井、钻机钻孔取芯样及打风钻孔超声波测试等资料分析，坝基存在一缓倾卸荷回弹顺层张裂面，降低了坝基抗滑稳定性，鉴此，对大坝坝基处理作了优化设计．1坝基工程地质条件1．1坝基
The initial design of Fenhe II reservoir dam foundation surface elevation of 827.70m, in the overlying 26 ~ 28m thick sand and gravel layer was dug through the exploration wells, drilling rig coring samples and wind drilling ultrasonic drilling Test and other data analysis, the dam foundation there is a slow dumping load rebound along the bedding Zhang Zhang, reducing the stability of the dam foundation anti-sliding, thus, the dam foundation treatment was optimized. 1 dam foundation engineering geological conditions 1.1 dam foundation