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通过室内冻融实验,以内蒙古自治区鄂尔多斯准格尔旗红色砒砂岩作为研究对象,研究并分析冻融次数以及含水率对原状砒砂岩融沉作用下的影响规律。研究表明:含水率在某个阈值范围内,融沉量是随着冻融次数的增加规律性增大的。原状砒砂岩的限定含水率在12%到13%之间,含水率较低时,融沉系数随着含水率的增大而增长,当土体含水率到达某一界限含水率,融沉系数随着冻融次数的增加而趋于平缓。本次试验含水率是对冻融过程融沉总变形影响较大的因素,含水率小的原状砒砂岩发生压缩变形,含水率大的发生隆起变形。无论冻融循环中其他因素如何变化,最终的融沉都会趋于稳定。
Through the indoor freezing and thawing experiments, the red 砒 sandstone of Zhunge’er Banner, Ordos Autonomous Region, was taken as the research object to study and analyze the influence of the number of freeze-thaw cycles and the water cut on the thawing sedimentation of undisturbed 砒 sandstone. The results show that the water content is within a certain threshold range, and the thawing settlement increases with the increase of the number of freeze-thaw cycles. When the water content of undisturbed 砒 sandstone is between 12% and 13%, when the water content is low, the melting and sedimentation coefficient increases with the increase of water content. When the water content of soil reaches a certain threshold moisture content, With the increase in the number of freeze-thaw tends to be gentle. The moisture content of the test is a factor that greatly affects the total deformation of the thaw during the freeze-thaw process. The undisturbed sands with small water content compressively deform, and the large water content occurs when the moisture content is large. No matter how other factors in the freeze-thaw cycle change, the ultimate thawing will tend to be stable.