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砂土液化问题的研究特别是砂土液化的判别目前已经取得了较大的进展,并在国内外现行的规范中充分反映,而砂砾土由于颗粒大、透水性好,普遍认为地震时孔压不至于上升至液化的程度,往往将其划分为非液化土类。通过调查汶川地震砂砾土液化情况以及勘察试验获取其土性资料,对比分析了国内外液化砂砾土的地质背景及土性特征。主要认识为:①以往国内外砂砾土液化实例虽然有限,但已经表明松散-稍密的砂砾土在一定的地震强度下仍有可能发生液化,而2008年汶川地震中的大量砂砾土液化的事实,说明笼统地将砂砾土划归为非液化土类的做法有误;②汶川地震液化砂砾土的颗粒级配范围涵盖了国内外其他地震的颗粒级配,研究汶川地震的砂砾土液化问题具有代表性和普遍性,以此建立的砂砾土液化评价方法在国际上应具有通用性。
At present, great progress has been made in judging the liquefaction of sand and sand, especially for the liquefaction of sand, which is fully reflected in the existing norms at home and abroad. Because of the large particle size and good water permeability, gravel soil is generally considered as the pore pressure Do not rise to the extent of liquefaction, often classified as non-liquefied soil. By investigating the liquefaction of gravel soil in Wenchuan earthquake and obtaining the soil data by investigation and investigation, the geological background and the soil characteristics of liquefied gravel soil at home and abroad are comparatively analyzed. The main findings are as follows: ① Although the past examples of gravelly soil liquefaction at home and abroad have been limited, it has been shown that the loose-slightly gravelly soil is still liquefied under a certain earthquake intensity and the fact that a large amount of gravel soil is liquefied in the 2008 Wenchuan earthquake , Which shows that the general classification of gravelly soil as non-liquefiable soil is wrong. (2) The grain grading range of liquefied gravel soil in Wenchuan earthquake covers the grading of other earthquakes at home and abroad. The gravelly soil liquefaction problem of Wenchuan earthquake has Representation and universality, the evaluation method of liquefaction of gravel soil established by this method should have universality in the world.