弱膨胀土特性及路堤填筑控制标准的探讨

Behaviors of Weak Expansive Soil and Suggestion on Standard of Constructing Embankment

对弱膨胀土进行不同击实功和含水量条件下的击实试验、CBR试验和 5 0 k Pa荷载下的膨胀量试验 ,查明其含水量、干密度和膨胀特性对 CBR值的影响。研究结果表明 :弱膨胀土的 CBR值主要受控于含水量和干密度 ,采用超过最佳含水量约 3.0 %的填筑含水量进行压实 ,压实度大于 95 % ,CBR值可达到 6 .0 %以上。最后对弱膨胀土用于路堤填筑的控制标准进行了探讨。

The compaction tests, CBR tests and swell capacity tests of 50 kPa pressure for the weak expansive soil were carried out under the different compactive effort and water content. The aim is to investigate the influence of water content, dry density and expansibility on the CBR values of weak expansive soil. The results show that the CBR values of weak expansive soil are determined by the water content and dry density mainly. Its compaction factors are more than 95% and the CBR values exceed 6% while the compaction is carried out under the water content that is 3% more than its optimum water content. At last, the standard of controlling compaction of the weak expansive soil for constructing embankment is suggested.