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以青海东部黄土区新建川大公路为依托,通过在坡脚处增设3排水泥土挤密桩来形成止水帷幕,并在坡脚处开挖浸水坑,以此来研究当坡脚积水时止水帷幕对黄土地基中水分场变化的影响。研究结果表明:止水帷幕未穿透湿陷性黄土下限深度时,由于侧向约束作用,水分在止水帷幕处理深度范围内只能沿竖向入渗,浸水9 d后绕过止水帷幕下端侵入内侧地基,坡脚、坡中处地基分别有约2 m和1 m厚的湿陷性黄土层被浸润,路肩处地基湿陷性土层未受影响;止水帷幕穿透湿陷性黄土下限深度时,水分被阻止未侵入止水帷幕内侧地基,止水帷幕具有良好的防排水效果。研究成果可为黄土地区地基处理提供参考。
Based on the newly-built Sichuan-Sichuan Highway in the loess region of eastern Qinghai Province, three water-tight compaction piles were added at the foot of the slope to form a water-stopping curtain and excavation of the dimple at the foot of the slope. Effect of Water Stop Curtain on the Variation of Water Field in Loess Ground. The results show that: when the curtain does not penetrate the lower limit of the collapsible loess, the water infiltration can only infiltrate in the depth of the curtain, due to the lateral restraint, and the curtain can be bypassed after 9 d At the bottom of intrusion, the collapsible loess layers of about 2 m and 1 m thick are infiltrated into the inner foundation, the foot of the slope and the bottom of the slope, respectively. The collapsible soil layer on the shoulder and shoulders is not affected. The waterproof curtain penetrates the collapsible Loess lower limit depth, the water is prevented from intrusion into the water curtain inside the foundation, water curtain has a good drainage effect. The research results can provide references for foundation treatment in loess area.