有压冻融循环下亚氯盐渍土融陷特性试验分析

Experimental Analysis of Thaw Settlement Characteristics of Chlorite Saline Soil under Pressure Freeze-Thaw Cycle

亚氯盐渍土的融陷性广泛影响着新疆公路基础建设。为研究亚氯盐渍土的融陷特性,以冻融循环为前提,采用固结仪杠杆加压法,研究含水率、干密度和上覆轴压对罗布泊亚氯盐渍土融陷系数影响规律。试验结果表明:亚氯盐渍土融陷系数随冻融循环次数增加而增大;随含水率、上覆轴压增大而增大;随干密度增大而减小。亚氯盐渍土冻融循环5次后融陷系数趋于固定值2. 53%,压力小于50 k Pa时,融陷系数增长速率较快;压力大于50 k Pa时,融陷系数增长速率逐渐减慢。研究成果可为分析亚氯盐渍土融陷机理和公路融陷病害防治提供参考。

The thawing of subchlorinated saline soil affects the infrastructure construction of Xinjiang highway extensively. In order to study the thawing characteristics of chlorine saline soils,the influence of water content,dry density and overlying axial pressure on the thawing coefficient of chlorine saline soils in Lop Nur was studied by using leverage pressure method of consolidation instrument on the premise of freezing-thawing cycles. The experimental results show that the thawing coefficient of chlorine saline soils increases with the increase of freezing-thawing cycles and with the increase of water content. The thawing coefficient of chlorite saline soil tends to be 2. 53% after five freeze-thaw cycles. When the pressure is less than 50 kPa,the growth rate of thawing coefficient is faster.When the pressure is greater than 50 k Pa,the growth rate of thawing coefficient slows down gradually. The research results can provide reference for analyzing the thawing mechanism of chlorinated saline soil and preventing and controlling Highway subsidence.