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河谷区的地下水水位线形态表征着河谷区地下水的流场特征,其成因关系到水库渗漏和工程的可行性。岩土体的渗透性对河谷地下水形态具控制性作用,在同一工程区内岩土体渗透性在空间上的分布也常常是不均一的,在我国西南部的高山峡谷地区,岩体的渗透性空间具明显的各向异性和分区分带特征,这使得地下水水位线形态在横剖面上呈现缓U型、斜W型和W型,在河流两岸产生地下水低凹带。通过对甘肃洮河九甸峡坝区地质条件的研究表明,河谷两岸地下水低凹带并非一定是存在强渗流通道所致,河谷区岩体渗透空间具有的分层分带和强各向异性特性足以使得河谷两岸出现地下水低凹带。这有效地解决了因坝区存在地下水低凹带而带来的疑虑和担忧,有力地推动了工程的进展,同时对于其他地区工程的开展具重要的借鉴意义。
The shape of the groundwater level line in the valley area is characteristic of the flow field of the groundwater in the valley area. The cause is related to the reservoir leakage and the feasibility of the project. The permeability of rock and soil body plays a controlling role in the shape of groundwater in the valley. In the same engineering area, the permeability of rock and soil body is often not uniform in the spatial distribution. In the alpine and canyon region in southwest China, the permeability of rock mass The obvious anisotropy and zonal zonation of the sex space make the groundwater level form slow-U, oblique W and W in the cross-section and produce low-lying groundwater belts on both banks of the river. Through the study of the geological conditions in the Jiudianxia dam area in the Qionghe River in Gansu Province, it is shown that the low diagenesis of groundwater in the two banks of the river valley is not necessarily caused by the existence of strong seepage channels. The stratified zonation and the strong anisotropy of the rock mass seepage space in the valley area Enough to make the low valley of the groundwater appear on both banks of the valley. This effectively solves the doubts and worries brought by the low groundwater level in the dam area, effectively promotes the progress of the project, and at the same time it has an important reference for the development of other regions.