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收集并分析了安哥拉共和国罗安达省的区域工程地质、水文地质以及气象水文资料。对该工程场地内上部棕红色粉砂土层进行了大量现场和室内试验研究,得出了矿物组成、物理力学指标、颗粒级配、水敏性、湿陷性等试验成果,为确定采取回填碾压地基处理方案提供了足够的参数。另外,介绍了对上部含粉土粉砂地层进行了模拟大气降水的渗透性试验,以研究该地层原状土及碾压后土层的渗透性;试验结果表明,模拟降雨量大于当地平均降雨量的情况下,经过12h连续模拟降雨,在原状土和经压实的土层中入渗最大深度分别为1.35m和1.2m。结合该工程基础埋深情况,最浅的基础埋深为1.4m渗入深度无法达到基底以下,大气降水入渗不会对之产生影响。
Regional engineering geology, hydrogeology and meteorological and hydrological data were collected and analyzed in Luanda Province, Republic of Angola. A large number of field and laboratory experiments were conducted on the upper brownish red silt layer in the project site. The experimental results of mineral composition, physical and mechanical indexes, particle gradation, water sensitivity and collapsibility were obtained. Rolling foundation treatment program provides sufficient parameters. In addition, the permeability experiment of simulating atmospheric precipitation on silt-bearing silt in the upper part is introduced to study the permeability of the undisturbed soil and the layer after rolling. The experimental results show that the simulated rainfall is larger than the average rainfall , The maximum depth of infiltration in undisturbed and compacted soils was 1.35 m and 1.2 m, respectively, after 12 h of continuous rainfall simulation. Combined with the depth of the foundation of the project, the shallowest foundation depth of 1.4m can not reach the infiltration depth below the basement, and the infiltration of atmospheric precipitation will not be affected.