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我省衡南县龙溪桥水库总干渠,在关头岭附近通过一段长900米的马鞍形山坳。这段山坳最大切深14.2米,最小6.5米,一般9.5米,山坳表层深约4～5米系黄粘土层,次为黄土夹白胶泥或全为白胶泥层,地下水位高,含水量大,摩擦角小,因此,切挖后极易崩垮,是一个严重的滑坡地段。该段渠道设计流量7.81秒立方米,计划开挖土方8.3万立方米,但是当开挖到7.85万立方米时,由于
Hengxian County, Hunan Province Longxi Bridge Reservoir Main Canal in the vicinity of the gateway through a section of 900 meters long saddle-shaped col. The maximum cut depth of this col is 14.2 meters and the minimum is 6.5 meters, generally 9.5 meters. The colloidal surface is about 4 ~ 5 meters deep, which is the yellow clay layer, the second is the white clay with loess clip or the white clay layer with high groundwater level and large water content , The friction angle is small, therefore, after cutting very easy to collapse, is a serious landslide lots. The section of channel design flow of 7.81 seconds cubic meters, plans to excavation of earth 83,000 cubic meters, but when excavation to 78,500 cubic meters, due to