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一般来讲,砂卵砾石地基是稳定性相对较好的天然地基。但是,当这种地基处于高寒地区、且地下水位埋藏较浅、地基土本身细颗粒含量较高、密实程度较差时,容易产生冻害及盐害、不均匀沉降等工程地质问题,尤其作为机场场道地基,其稳定性能否满足机场场道对地基的要求还是一个有待解决的问题。我国正在建设的西藏阿里昆莎民用机场,遇到的就是这种地基。设计人员通过现场地基处理试验等,确定“粗颗粒砂卵砾石换填+冲击碾压”为机场场道地基处理的基本方法,为机场设计、建设提供了科学依据。
In general, sand and gravel base is relatively stable natural foundation. However, when such a foundation is located in the alpine region, and the groundwater level is buried shallowly, and the finely-grained content of the foundation soil itself is relatively poor, the engineering geological problems such as frost damage, salt damage and uneven settlement are likely to occur, especially as an airport Whether the stability of the ground of the stadium meets the requirements of the ground of the airport is still a problem to be solved. It is this kind of foundation that is being encountered in the civil airport of Ali Kunsha, under construction in our country. Designers through the foundation treatment test, etc., to determine “coarse gravel sand gravel for filling + impact crush ” for the airport ground treatment of basic methods for the airport design, construction provides a scientific basis.