The finer layers generally consist of carbonaceous clay, mildclay and silty sand, showing characteristics of lacustrine sedimentation.
细粒层均为含炭的粘土、亚粘土和粉砂,具湖塘相沉积的特点。
2
The entrance area of Yunyang Mountain Tunnel on Hengyang-Yanling Highway was widely distributed with mildclay, and it has poor rock stability and almost with no self-stabilizing capacity.