凍融作用下水泥改良軟黏土的性能演化過(guò)程
[Abstract]:Taking the soft clay in Tianjin Binhai New area as the research object, four kinds of cement modified soft clay samples with initial moisture content were prepared, and their unconfined compressive strength (UCS) test and pore analysis were carried out under different freeze-thaw cycles. The results show that with the increase of freeze-thaw cycles, the unconfined compressive strength of the samples decreases gradually, and the strength attenuation is mainly concentrated in the early stage of 1 ~ 3 freeze-thaw cycles. Under the same freeze-thaw cycles, the higher the initial moisture content, the greater the strength loss rate. The pore distribution of the sample is affected by the number of freeze-thaw cycles and the initial water content. With the increase of the initial water content, the pore distribution evolves from the small pore distribution area to the larger pore distribution area. Under the condition of low saturation, freezing and thawing will cause shrinkage of local pores in soil, but at the same time, it will induce cracks, and at high saturation, freezing and thawing will lead to loose structure of soil. In general, the freezing and thawing cycle will cause obvious damage to the microstructure of the cement modified soft clay, and eventually lead to the gradual decline of the macroscopic mechanical strength of the soft clay. Therefore, in engineering practice, it is necessary to pay more attention to the later strength of cement modified soft clay, and strictly control the humidity state of its initial filling.
【作者單位】: 三峽大學(xué)三峽庫(kù)區(qū)地質(zhì)災(zāi)害教育部重點(diǎn)實(shí)驗(yàn)室;宜昌朗天新型建材有限公司;
【基金】:湖北省自然科學(xué)基金資助項(xiàng)目(2014CFB664) 國(guó)家自然科學(xué)基金資助項(xiàng)目(51579137)
【分類號(hào)】:TU43
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