基于料场分区的汤坝防渗料掺配利用研究

Study on Mixing and Utilization of Impervious Earth of Tangba District Based on Earth Field Division

为提高长河坝水电站汤坝土料场的土料利用率,依据详细的勘察成果与室内、现场掺配试验,研究了基于料场分区的偏粗、偏细土料相互掺合后的掺配料利用。结果表明,以P5=43%为控制掺配目标值的掺配料能最大限度地满足填筑设计要求,该掺配料与直接上坝料在渗流、强度及应力变形力学工程特性方面均差异较小,且可使土料场粗、细土料的利用率提高到76%以上,可作为250m级高土石坝心墙料的填筑使用。

In order to improve the soil material utilization ratio of the Tangba earth material field of the Changheba hydropower station,this paper makes a systematic study on the blending of the course and the fine soil materials which are mixed with each other based on the detailed exploration results,mixed earth test and the laboratory test.The results show that the mixed earth blending of the target value with P5=43%can satisfy the design requirements to the maximum degree,the mechanical characteristics of seepage,strength and stress deformation are less between the mixed earth and the natural earth.Moreover,they can increase the utilization rate of natural earth material to more than 76%,which can be used as the filling application of the core wall of the 250 mhigh earth-rock dam.