新疆阿拉山口地区盐渍土盐胀与溶陷特性研究

以阿拉山口市—温泉县—G30公路建设项目为依托,通过控制变量法研究冻融循环次数、含盐率、含水率及荷载对盐渍土盐胀和融陷变形量的影响情况。试验结果表明:在进行盐胀试验时,盐胀性随着盐渍土含水率的增加逐渐增大;随着含盐率的增加,盐渍土盐胀特性也更明显;随着温度的降低,盐渍土盐胀量也逐渐增大,但当含盐率和含水率到达一定程度后,盐胀量则不会随着温度下降而增大;在进行溶陷试验时,在不考虑含盐量的情况下,各组土体均随着含水率增高而沉降量越大;在荷载相同的情况下,含盐量越大,沉降量越大;随着压力的增加,盐渍土仍会发生较大沉降。

Study on Characteristics of Salt Swelling and Subsidence of Saline Soil in Alataw Pass of Xinjiang

Based on the Alataw Pass City-Wenquan County-G30 Highway Construction Project,the influence of the freezing-thaw cycle times,salt content,moisture content and load on the deformation of saline soil during salt swelling and melting is studied by the control variable method.The test result shows that the salt swelling property will gradually increase with the increase of the moisture content of saline soil during the salt swelling test.With the increase of salt content,the salt swelling property of saline soil is also more obvious,and with the decrease of temperature,the salt swelling amount of saline soil also gradually increases.But when the salt content and moisture content reach a certain degree,the salt swelling amount does not increase as the decrease of temperature.During the subsidence test,the settlement of soils in each group increases with the increase of moisture content under the condition of not considering the salt content.The greater the salt content,the greater the settlement under the same load.With the increase of pressure,the saline soil will still settle considerably.