苏丹膨胀土工程地质性质

Engineering geological properties of expansive soil in Sudan

为了查清苏丹膨胀土的工程地质性质 ,进行了系统的现场和室内研究测试工作 ,包括现场浸水膨胀试验、膨胀剪切力试验、标准贯入、静力触探、十字板剪切、微型贯入、纵横波速、卓越周期、刚度系数、电阻率测试 ,和在实验室进行的密度、表观密度、含水质量分数、干密度、最优含水质量分数、收缩率、自由膨胀率、不同压力下的膨胀率、膨胀压力、三轴实验、直剪实验、固结实验、渗透实验、酸碱性测试等 ,得出了天然和饱水状态下苏丹膨胀土的物理力学性质指标 ,定量分析了膨胀土性质随含水质量分数的变化及膨胀影响因素 ,建立了膨胀压力和膨胀量的预测公式。

The square of Sudan is 2600 thousand km 2, one third of it has expansive soil distribution that often induces damage to engineering construction above or under ground. Many In Situ and laboratory researches had been done, including In Situ soaked load test, expansive shear force test, SPT, CPT, VST, micro penetration test, wave velocity, predominant period, rigidity coefficient, electrical elec. resistance ratio, and special gravity, density, water content, sieve, liquid and plastic limit, max. Dry density, optimum moister content, shrinkage coefficient ratio, free expansive ratio, swelling pressure, swelling movement under different load, triaxial and direct shear test, consolidation test, permeability test and chemical analyses, etc., to discover the physical and mechanical properties of Sudan expansive soil under nature and saturated situation, analysis quantitatively the property changing with water content and the factors that influence swelling, establish the predictive equations of swelling pressure and swelling movement.