本文選題：垃圾填埋體 + 壓實黏土層��； 參考：《巖土力學》2014年10期

【摘要】：垃圾填埋體不均勻沉降等容易引起壓實黏土防滲層開裂,顯著降低其防滲性能。將裂隙作為高滲透性的多孔介質材料,建立了含單一裂隙壓實黏土層的飽和/非飽和滲流模型,數(shù)值研究了含裂隙黏土層中的優(yōu)勢滲流過程,對比分析了裂隙位置、深度、寬度和滲透系數(shù)對壓實黏土層水分擊穿時間和穩(wěn)定滲漏量的影響。結果表明,含裂隙壓實黏土層的滲流過程可分為3個階段:初始階段、擊穿階段和穩(wěn)定階段;底部裂隙對壓實黏土層防滲性能的影響較小,而頂部裂隙和貫通裂隙的影響較大;水分擊穿時間隨裂隙深度增大而迅速縮短,為保證黏土層防滲性能,宜將裂隙深度控制在0.1倍土層厚度以內;水分擊穿時間和穩(wěn)定滲漏量隨裂隙寬度、滲透系數(shù)的增大而分別縮短和增加,且當其達到一定值后逐漸趨于穩(wěn)定;裂隙貫通后將顯著降低壓實黏土層的防滲性能,其穩(wěn)定滲漏量隨裂隙寬度和滲透系數(shù)的增大而呈線性增長。
[Abstract]:The non-uniform settlement of the landfill can easily cause the cracking of the compacted clay anti-seepage layer and significantly reduce its anti-seepage performance. A saturated / unsaturated seepage model with a single fissure compacted clay layer is established by using the fissure as a porous medium material with high permeability. The numerical study on the predominant seepage process in the fractured clay layer and the comparative analysis of the crack are made. The effect of gap position, depth, width and permeability coefficient on the water breakdown time and stable leakage of compacted clay layer. The results show that the seepage process of the compacted clay layer can be divided into 3 stages: the initial stage, the breakdown stage and the stable stage; the bottom fissure has little effect on the impervious performance of the compacted clay layer, and the top crack and through through. In order to ensure the permeability of clay layer, the fracture depth should be controlled within 0.1 times the thickness of the soil layer, and the water breakdown time and the steady leakage are shortened and increased respectively with the increase of the crack width and the permeability coefficient. Stability, fracture penetration will significantly reduce the permeability of compacted clay layer, and its stable seepage will increase linearly with the increase of fracture width and permeability coefficient.

【作者單位】： 浙江大學
【基金】：國家重點基金研究發(fā)展計劃(973計劃)項目(No.2012CB719805)
【分類號】：TU46

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本文編號：1836747