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中国湿陷性黄土分布较广,在湿陷性黄土地基上进行工程建设时,必须考虑因黄土的湿陷性引起的附加沉降对工程可能造成的危害,所以应选择合适的地基处理方法,消除或避免因土质湿陷性造成的工程危害。该文以某机场二期飞行区土方地基处理工程为依托,对原地基进行强夯处理,通过现场测试和室内试验对比,分析地基处理后土体的物理力学指标,研究采用强夯法处理后湿陷性黄土地基的承载力、地基的有效影响深度与地基处理后土层的湿陷系数。结果表明:200t·m终夯面以下5m深度内,强夯后土基的压实度都达到80%以上,湿陷性均被消除,已达到建设标准。
Due to the wide distribution of collapsible loess in China, the construction of collapsible loess foundation should consider the possible harm to the project caused by additional settlement due to the collapsibility of loess. Therefore, the appropriate ground treatment method should be selected to eliminate Or to avoid engineering damage caused by soil collapsibility. Based on the earthwork treatment project in the second flight area of an airport, the paper carries out dynamic compaction treatment on the original ground. Through field test and laboratory test, the physical and mechanical indexes of soil after foundation treatment are analyzed. After the treatment by dynamic compaction, The bearing capacity of collapsible loess foundation, the effective depth of foundation and the collapsible coefficient of soil after foundation treatment. The results show that the compaction degree of the soil foundation after the dynamic compaction reaches more than 80% within 5m below the final surface of 200t · m, and the collapsible nature is eliminated, which has reached the construction standard.