某水库坝址区白云岩岩溶发育特征及对工程影响

Karst Development Characteristics of Dolomite in a Reservoir Dam Site and Its Influence on the Project

某水库坝址区地处岩性为白云岩的中低山地区,根据工程经验,此类地区岩溶形态一般以溶隙、溶槽、小溶洞为主要,岩溶往往不发育,但在该坝址区勘察时发现,除上述岩溶形态外,层间破碎溶蚀缝较发育,同时也存在右岸地下水位低平、河床下存在低水头承压含水层等问题。总结该坝址区白云岩岩溶主要具有河床发育高程远低于两岸、左岸弱于右岸和河床、沿层面发育等特征,对其可能引起的渗漏、坝基稳定、承压水等问题进行了分析,为类似工程提供参考。

The dam of a reservoir is located at a low mountain region made up of the dolomite, according to engineering experience, the karst is not developed there, the dissolved crack, melting tank and small karst cave are the most common types. But when we surveyed in dam area, we saw that the inter-layer broken dissolution joints are well developed, moreover, it is found that the water table of the right bank is low, and the low-head confined aquifer exists in the river bed. The dolomite karst features on the dam area are summarized, including the riverbed elevation is far lower than the two banks, the left bank is weaker than the right bank and riverbed, and developing along the bedding plane, moreover, its impact on engineering problems, such as leakage, the stability of dam foundation and confined water, is analyzed, which provides a reference for similar projects.