新疆板块状盐渍土工程特性(英文)

Engineering characteristics of plate-like saline soil in Xinjiang

采用室内颗粒分析试验、界限含水量（质量分数）试验、击实试验、强度特性试验、变形特性试验和溶胀试验分析了板块状盐渍土工程特性。分析结果表明：板块状盐渍土主要由砾类土构成,其级配因取土样位置而差异较大;塑性指数范围、最大干密度范围与最佳含水量范围分别为0.57~3.20、2.22~2.25 g.cm-3与5.7%~6.2%;天然状态下的无侧限抗压强度最大值为28.6 MPa,具有岩石的特性,属于盐岩;板块状盐渍土为低压缩性土,满足高速公路地基变形指标要求;在水、热环境的变化下,随着板块状盐渍土含盐量的增大,溶陷系数与盐胀力（量）增大,盐胀起胀温度随着硫酸钠含量的增加有较大幅度的提前;盐渍土地区公路交通荷载可抑制其盐胀,从而可以降低盐胀对工程产生的病害。

The engineering characteristics of plate-like saline soil were analysed on the basis of laboratory particle size analysis test,water content（mass percentage） limit test,compaction test,strength test,deformation test and swelling test.Analysis result shows that plate-like saline soil is mainly made up of gravelly soil and has different gradations resulted from sampling locations.The ranges of plasticity index,maximum dry density and optimum moisture content are 0.57～3.20,2.22～2.25 g·cm-3 and 5.7%～6.2% respectively.Under natural condition,its maximum unconfined compressive strength is 28.6 MPa,and it has the characteristics of rocks and belongs to rock salt.Plate-like saline soil has low compressibility and meets the deformation index requirement of highway subgrade.Under the change of water and heat environment,with the increase of salinity,the coefficient of collapsibility and salt-expansion stress increase,and the salt-expansion temperature reaches ahead of time as the sodium sulfate content increases.Salt expansion can be controlled by vehicle load,which reduces the engineering disease resulted from salt expansion.10 tabs,5 figs,21 refs.