引江济汉工程渠道膨胀土分类及工程处理

膨胀土问题是引江济汉工程的关键技术问题之一。在大量的试验分析、研究的基础上,经对比分析,确定适合引江济汉工程区特点的分类指标及分类方法。为适应膨胀土分布不均一的特性,采取"样本1/3"法则对单层土体的膨胀性进行判别及"厚度1/3"法则对渠道膨胀土进行界定。并根据膨胀土的宏观地质特征,进行野外快速判别,以指导工程施工。在此基础上,针对不同膨胀等级的渠段进行可靠、经济合理的工程处理。

Classification and Engineering Treatment of Expansive Soil in the Channels of the Yangtze River-Hanjiang River Water Transfer Project

Expansive soil is one of the key technological problems for the Yangtze River-Hanjiang River Water Transfer Project.Based on numerous experimental investigations and analyses,the classification indicators and method for the expansive soils in this engineering area were determined using the comparative analysis.In order to reflect the characteristics of the uneven-distributed expansive soils,the expansibility of a single-layer soil was distinguished based on the rule of "one third sample" and the expansive soils in the canals were defined based on the rule of "one third thickness".Then,the macro geological features of the expansive soils were used for a rapid judgment of them in the field,which can guide the engineering construction.The above classification can provide the reliable and economical engineering treatments for the channels with different swelling potentials.