本文選題：人工凍土　切入點：溫度梯度　出處：《采礦與安全工程學報》2015年06期

【摘要】：為了研究人工鑿井凍結法施工中凍結壁解凍融沉效應的產(chǎn)生而導致井筒壁后附加力的變化,以徐州黏土凍融為研究對象,通過人工凍結土融沉特性試驗,分別開展了人工凍土不同含水率、不同單向凍結溫度梯度、不同外荷載的凍融特性分析。結果表明:試驗系統(tǒng)補水情形下,相同干密度的黏土單向凍結溫度梯度為1.4℃/cm時融沉量值為0.98 mm,大于2.0℃/cm融沉量值0.61 mm,增大幅值約60.6%;相同單向凍結溫度梯度下,隨著外載荷的增大融沉量隨之增大,兩者增長趨勢一致,但幅度不一致�；趯鐾寥诔撂匦允芏嘁蛩鼐C合影響的認識,采用改進的人工神經(jīng)網(wǎng)絡方法,建立了多樣本、多因素影響下的融沉系數(shù)關系數(shù)據(jù)庫,誤差分析表明,改進的預測算法具有較好的精度。
[Abstract]:In order to study the effect of thawing thawing and thawing on the freezing wall in the construction of artificial shaft sinking, the additional force behind the shaft wall is changed. The frozen and thawed clay in Xuzhou City is taken as the research object, and the characteristic test of thawing settlement of the frozen soil is carried out. The freeze-thaw characteristics of artificial frozen soil with different moisture content, different unidirectional freezing temperature gradient and different external loads are analyzed respectively. When the unidirectional freezing temperature gradient of the same dry density is 1.4 鈩，

本文編號：1681618