人工冻土融沉试验及融沉系数预测研究

发布时间：2018-03-29 14:51

  本文选题：人工冻土　切入点：温度梯度　出处：《采矿与安全工程学报》2015年06期

【摘要】：为了研究人工凿井冻结法施工中冻结壁解冻融沉效应的产生而导致井筒壁后附加力的变化,以徐州黏土冻融为研究对象,通过人工冻结土融沉特性试验,分别开展了人工冻土不同含水率、不同单向冻结温度梯度、不同外荷载的冻融特性分析。结果表明:试验系统补水情形下,相同干密度的黏土单向冻结温度梯度为1.4℃/cm时融沉量值为0.98 mm,大于2.0℃/cm融沉量值0.61 mm,增大幅值约60.6%;相同单向冻结温度梯度下,随着外载荷的增大融沉量随之增大,两者增长趋势一致,但幅度不一致。基于对冻土融沉特性受多因素综合影响的认识,采用改进的人工神经网络方法,建立了多样本、多因素影响下的融沉系数关系数据库,误差分析表明,改进的预测算法具有较好的精度。
[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，

本文编号：1681618