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在罗安达及其周边,浅部广泛分布有红色和黄色两种色调的粉砂层。结合实际工程,采用现场调查、室内试验、现场标贯试验和载荷试验等手段对该种砂土进行了分析,结果表明,罗安达砂层在自然状态下可直立,具湿陷性和浸水后力学性质明显变差等独特物理力学特性;湿陷性随孔隙比增大,含水率减小,试验压力增大,黏粒和粉粒含量增大而增强,重塑砂土也具有湿陷性;力学性质随含水率的变化可逆,当含水量增加后再减小,其力学性质可明显恢复。
In Luanda and its surroundings, silt layers of two shades of red and yellow are widely distributed in the shallow parts. According to the actual project, the sand was analyzed by on-the-spot investigation, laboratory test, field standard test and load test. The result shows that the sand of the Luodasa can be upright, collapsible and wet after soaking Mechanical properties were significantly worse and other unique physical and mechanical properties; collapsibility with the porosity ratio increases, the moisture content decreases, the test pressure increases, clay and powder content increases and enhance the remolded sand also has collapsible ; Mechanical properties with the change of water content reversible, when the water content increases and then decreases, its mechanical properties can be significantly restored.