先注漿再凍結(jié)對(duì)粉細(xì)砂力學(xué)性質(zhì)影響的低溫三軸試驗(yàn)(英文)
[Abstract]:There are two disadvantages in artificial formation freezing method: local strength deficiency and frost heaving and thawing settlement. The pre-grouting method can improve the overall strength of fine sand formation and control the frost heaving capacity after freezing. It is considered to be an effective supplement to artificial formation freezing method. Since pre-grouting can effectively improve the strength and impermeability of soil, a series of triaxial shear tests at low temperature were carried out, and the effects of simple freezing and pre-grouting followed by freezing on the shear strength of fine silt were studied. On the basis of analyzing the effect of improving the strength of fine sand by grouting and freezing, the effects of cooling temperature, water-cement ratio, water content, curing time and lateral pressure on shear strength index and Secant modulus at peak value of stress-strain curve are analyzed. The results show that the shear strength of fine sand increases with the decrease of cooling temperature, which is proportional to the ratio of water to cement, water content and curing time, and the Secant modulus also increases with the decrease of cooling temperature, which is proportional to the ratio of water to cement and water content. In addition, there is a good linear relationship between cohesive force and temperature, and a good exponential function relation with water-cement ratio and water content. The internal friction angle has a good power function relation with temperature and water content, and a good exponential function relation with water-cement ratio. The results can be used as a reference for the analysis of mechanical strength index of pre-grouting and then freezing fine sand, as well as for the selection of water-cement ratio and curing time of grouting-freezing method.
【作者單位】: 同濟(jì)大學(xué)土木工程學(xué)院;北京交通大學(xué)土木工程學(xué)院;
【基金】:supported by the Natural Science Foundation of Zhejiang Province of China (No.LZ13E080002)
【分類(lèi)號(hào)】:U416.1
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