引江济汉工程中膨胀土的危害及防治措施

Hazard of Expansive Soil in Yangtze River to Hanjiang River Water Transfer Project and Control Measures

引江济汉工程膨胀土区段出现了渠道边坡失稳,边坡承载力降低,混凝土渠道衬砌变形、开裂等技术问题。本文在说明现场地质条件、阐述膨胀土工程危害的基础上,总结论述了当前膨胀土区段的工程施工治理措施。针对膨胀土在水下及地下水位变动区易发生渗透变形而影响基础稳定的特点,提出了采用柔性沥青混凝土边坡的设想,以提高渠坡的稳定性。

The expansive soil section of Yangtze River to Hanjiang River Water Transfer Project has technical problems of channel slope instability,slope bearing capacity reduction,concrete channel lining deformation,cracking,etc. The project construction governance measures of the current expansive soil section are summed up and discussed on the basis of describing field geological conditions and elaborating expansive soil engineering hazards in the paper. The assumption of adopting flexible asphalt concrete slope is proposed aiming at the feature that the expansive soil is prone to seepage deformation to affect foundation stability in the water level change area under water and ground,thereby improving the channel slope stability.