高液限黏土工程特性及改良试验研究

以浙江高速公路沿线天然高液限土为研究对象,分析其路用性能及不同含水率下石灰、水泥掺量的改良效果.结果 表明:当含水率较低时,增大击实功,压实度显著提高,而含水率超过最优含水率后影响不明显;土体在未浸水情况下CBR值较高,CBR值随含水率的增大呈递减趋势,浸水后强度明显降低;掺石灰与水泥后击实曲线明显变缓,使得改良土具有...

Experimental Study on Engineering Characteristics and Improvement of High Liquid Limit Clay

Selecting the natural high liquid limit soil along highways in Zhejiang province as the research object, its road performance and the improvement effect of lime and cement content with different water content are analyzed. The results show that when the moisture content is low, the compaction degree increases significantly with the increase of compaction work, but the influence of water content is not obvious when it exceeds the optimal water content.The CBR value of soil is higher without soaking, and the CBR value decreases with the increase of water content, and the strength decreases obviously after soaking.The compaction curve slows down obviously after lime and cement adding, which makes the improved soil have wider compaction water content interval.Lime and cement have significant effect on increasing CBR value and decreasing linear expansion rate of high liquid limit soil.Yet the linear expansion rate of lime improved soil is far less than that of cement improved soil, and the water stability of lime improved soil is better. Comprehensive analysis shows that the improvement effect of 4 % lime content is the best.