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根据大通河纳子峡面板砂砾石坝的工程特点和料场情况,对纳子峡水电站下游C1料场B、F区及河床的天然砂砾石土料做了筛分试验,绘制了土料的颗粒级配曲线,得出C1料场B、F区土料满足垫层设计要求,且F区土料更优;同理天然砂砾石亦满足主堆石区料设计要求。根据设计要求的颗粒级配、砂土的相对密度、压实度等,对垫层2A1、砂砾石料区3B1土料做了渗透变形试验,发现土料渗透变形破坏均经历了土样保持原状、细颗粒浮动、形成渗漏通道及土样完全破坏4个阶段,绘制了流速—渗透坡降双对数曲线图,据此求得了垫层2A1、主堆石区3B1土料的临界坡降,再根据现行规范取安全系数2.0,从而求得垫层2A1、主堆石区3B1土料允许渗透坡降分别为0.463、0.163。
According to the engineering characteristics of Datonghe Nazi Gorge Panel Grit Dam and its material field conditions, the natural sand and gravel soil material in C1, F area and riverbed of C1 downstream of Naizixia Hydropower Station was screened, Particle grading curve obtained Cl material field B, F area of soil to meet the design requirements of cushion, and F soil material is better; the same natural gravel also meet the main rock material design requirements. According to the design requirements of the particle grading, the relative density of sand, compaction, etc., to the cushion layer 2A1, sand and gravel material area 3B1 made infiltration deformation test and found that the infiltration and deformation of soil material have experienced the original soil samples, Fine particles floating, the formation of leakage channels and soil samples completely destroyed four stages, draw the flow rate - infiltration slope logarithm of the logarithm plot, thus obtained cushion 2A1, the main rockfill zone 3B1 soil material critical gradient, Then take the safety factor 2.0 according to the current standard, so as to obtain the cushion 2A1. The permissible slope of the soil material of the main rockfill zone 3B1 is respectively 0.463 and 0.163.