硫酸盐渍土机场盐胀破坏试验研究

The experiment of sulphate saline soil airport salt heaving ruin

通过室内试验,模拟研究了机场浸水条件下不同压实度、不同硫酸钠含量的土质区与道面区盐渍土的膨胀性,分析了压实度、含盐量、水分、荷载对硫酸盐渍土机场破坏的影响,结果表明,压实度、含盐量越大,膨胀量亦越大,压实度、含盐量不均匀是机场破坏内因;水分、荷载是道面破坏的外部因素,水分对膨胀影响很大;道面区的膨胀比土质区要小得多,道面结构层自重荷载对膨胀有较好抑制作用,但25 kPa还不足以抑制膨胀。

Through indoors experiments, salt heaving of sulphate saline soil in terrene area and pavement district of airport is simulated under the condition of water soakage, considering different compaction degree and saltness. The effect to sulphate saline soil airport ruin produced by com-paction and saltness degree, water and load were analyzed. The result is that, higher degree of compaction and saltness bring bigger salt heav-ing ,different degree of compaction and saltness are the inside reasons of airport ruin, water and load are out reasons, water is especially impor-tant factor, salt heaving in pavement district is much more small than terrene area, deadweight of structural layer can restrain the salt heaving well, but 25 kPa is not enough to reduce it to zero.