安哥拉Cacuaco地区膨胀土工程性质初探

安哥拉Cacuaco地区残坡积的黏土、粉质黏土为典型的膨胀土,由于缺乏相关资料和工程经验,在该地区进行工程建设具有较大的风险和技术难度。通过对区内某水泥厂的岩土工程详细勘察,采取室内土工试验,现场原位测试等方法得出了Cacuaco地区膨胀土的膨胀率、剪切强度、固结、渗透系数等基本工程性质指标,揭示了该膨胀土含大量亲水矿物、增湿强度大幅衰减、无荷膨胀率较高等主要特点。同时,基于对拟建工程的变形监测,分析和评价了膨胀土地基对建筑物产生的影响,并进一步阐述了该地区地基基础方案的选择。

Preliminary Discussion on Engineering Properties of Expansive Soil in Cacuaco Angola

The residual or slope deposit clay around Cacuaco area is typical expansive soil ,due to lack of relevant data and engineering experience ,it is of great risks and technical difficulties to carry out civil engineering construction in this area .In this paper ,through detailed investigation and construction investigation of a cement plant in this area ,the basic engineering property index of expansive soil such as swelling ratio ,shear strength ,consolidation strength ,permeability coefficient etc .is determined in Cacuaco area by using laboratory soil tests and in situ tests method .Such as a large amount of hydrophilic minerals ,strength greatly attenuated when humidification ,high swelling ratio under 0kPa are re-vealed as the key features of the expansive soil .At the same time ,based on the deformation monitoring of the proposed project ,the influence of the expansive soil foundation on the building is analyzed and evaluated ,and the selection of the foundation scheme is further expounded .