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万家寨工程的河床和两岸的地层主要由寒武系中、上统灰岩组成。其产状平缓， 发育有规模不等的层间褶曲、穹隆及裂隙。水库右岸虽存在永久岩溶渗漏， 但由于岩溶发育程度有限和不存在集中渗漏通道， 其渗漏量不大且不会影响水库运行效益。层间剪切带是大坝的主要工程地质问题， 经设计核算， 层间剪切带抗剪强度值满足设计要求， 大坝是稳定、可靠的。
Wanjiazhai project of the riverbed and strata mainly by the Cambrian, the upper member of the limestone. Its smooth shape, the development of a range of sizes ranging from the layers of folds, vaults and cracks. Although there is permanent karst leakage on the right bank of the reservoir, due to the limited development of karst and the absence of centralized leakage channels, the seepage amount is not large and will not affect the operation efficiency of the reservoir. The interlayer shear zone is the major engineering geological problem of the dam. After design and calculation, the shear strength values of the interlayer shear zone meet the design requirements. The dam is stable and reliable.