论文部分内容阅读
在季节冻土区,反复冻融作用能够导致土体中水分迁移和重分布;对土体施加静荷载时,土体内部应力场发生变化,水分场也发生变化。通过对EC-5土壤水分传感器进行标定发现,相同密度条件下,含水量低于26.2%时,测试结果误差较小,高于26.2%时,则误差较大;不同密度时,密度越大,所测得的电压值越大。通过模型试验,研究冻融循环作用和冻融与静荷载双重作用下土体中水分场的变化规律,试验结果表明:两种情况下,土体内部水分含量都随冻融循环次数的增加而逐渐增大;无荷载时,在距表层0~20 cm范围内有含水量较高区域;施加静荷载时,在荷载下方和距离荷载最远的土体表层有三个水分集中区域,而在荷载两侧则有两个低含水量区域。
In the frozen season, repeated freezing and thawing can lead to the migration and redistribution of water in the soil. When the static load is applied to the soil, the internal stress field changes and the water field changes. Through the calibration of EC-5 soil moisture sensor, when the water content is less than 26.2% under the same density condition, the error of the test result is small, while when the moisture content is higher than 26.2%, the error is larger; at different densities, The greater the measured voltage value. Through the model test, the variation law of water field in soil under the action of freeze-thaw cycle and freeze-thaw cycle and static load was studied. The results show that in both cases, the internal moisture content of soil increases with the number of freeze-thaw cycles Gradually increasing. In the absence of load, there is a region with high water content in the range of 0 ~ 20 cm from the surface. When static load is applied, there are three water concentration areas under the load and the farthest away from the load, There are two low water areas on both sides.