邵阳膨胀土膨胀特性试验研究

Experimental Study on Expansive Characteristics of Expansive Soil in Shaoyang Area

为探究邵阳膨胀土对该地区基础设施建设的不利影响,开展了一系列基本物理力学性质指标试验.分析了浸水时间、压实度、上覆荷载大小、含水率对膨胀量的影响.结果表明:膨胀变形在浸水初期发展较快,后期发展缓慢;浸水稳定后膨胀系数随压实系数增大呈线性增加;膨胀变形随上覆荷载和含水率增加分别表现为对数减小和线性减小关系.该结论对膨胀土路基边坡等工程的设计与施工提供了试验依据.

To study the adverse effect of expansive soil on the infrastructure in Shaoyang Area, a series of basic physical and mechanical property tests are carried out. The effect of expensive value caused by soa- king time, degree of compaction, size of overlying load and moisture content are analyzed. The results show that the expansion deformation develops rapidly at the beginning, develops slowly in the late; after immersion stability with the increase of compaction coefficient, the expansion coefficient increases linearly; and with the increase of overlying load and moisture content, the expansion deformation decreases logarithmic and linearly respectively. The conclusion can provide experiment evidence for the design and construction of expansive soil subgrade and slope engineering.