黄土喀斯特工程地质问题对治沟骨干工程的影响

黄河中游沉积的第三纪、第四纪黄土,由于湿陷、冻融、地下水溶蚀和地表径流冲刷等作用,产生大量落水洞、陷落坑和黄土桥、黄土柱等。这种地质地貌景观,与石灰岩区的喀斯特类似,故称黄土喀斯特。修建树梓沟骨干坝中,因处理岸坡喀斯特暗洞,使总工程量较原设计增加18.27%,总投资增加24.69%。在黄土高原选定治沟骨干工程坝址时,应十分注意黄土喀斯特地质问题。

Engineering geological problems of loess karst and their influnce on dam work in gullies

In the loess of Tertiary and Quaternary Period, there are a lot of dolines, sotches,loess bridges, loess columns and other geomorphologic patterns formed in result of wet down punching , frozen-melting p rocess, resorption of underwater and scouring by surface runoff. These landscapes are similar to that of karst in limestones, so they are called loess karst. Because of the loess karst the volumes of dam work in gullies increase by 18.27% and investment by 24.67%, and great attention should be paid to loess karst geological problems during the choice of damsites in gullies.