西藏某水利枢纽深切河槽边坡卸荷深度勘察

Investigation on Unloading Depth of Deep Channel Slope of a Hydraulic Complex in Tibet

西藏某水利枢纽为中型水利工程,拦河坝部位发育深切河槽,传统边坡卸荷勘察通常采用勘探平洞,根据平洞内裂隙张开宽度判别边坡卸荷深度。西藏地区火工材料办理困难,平洞实施成本高、周期长,且施工受高寒气候影响大,制约工程进展。文章通过水平孔钻探,结合钻孔电视、声波测试,查明边坡卸荷深度,为工程设计提供基础资料。

A water conservancy complex in Tibet is a medium-sized water conservancy project with deep river channel developed in the barrage area. Traditional side slope unloading investigation usually uses exploratory flat cave to determine the unloading depth of side slope according to the crack opening width in flat cave. It is difficult to handle the pyrotechnical materials in Tibet, the implementation cost of flat tunnel is high, the period is long,and the construction is greatly affected by the high and cold climate, which restricts the progress of the project. In this paper, through horizontal hole drilling, drilling television and sound wave test, the unloading depth of slope is found out, which provides basic data for engineering design.