地形坡度场地分类法在玉溪-江川-通海盆地的适用性研究
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摘要
基于高精度的ASTER GDEM数据,利用Wald和Allen地形坡度场地分类法,并借鉴30 m等效剪切波速v30s和20 m等效剪切波速v20s之间的关系,对我国云南的玉溪盆地、江川盆地、通海盆地的场地土,按照我国的场地土类别规则加以划分,并将结果与综合探测的"真实结果"进行了对比,结果表明:(1)地形坡度场地分类法划分出了中硬土ZYⅡ和中软土ZRⅢ这两种区域,定性上与"真实情况"相类似。(2)将玉溪地区当作活动地块,比将其当作稳定地块,要更符合实际情况。(3)该方法没有划分出软弱土RRⅣ区,与"真实情况"相比,定量上存在显著的、较大的差别。说明将该方法直接应用于深厚的、成因复杂的沉积盆地的场地土类别划分,是有局限性的。
Based on high precision ASTER GDEM data,using Wald and Allen topographic slope method,and the relationship between underground 30 m equivalent shear wave velocity v30 sand underground 20 m equivalent shear wave velocity v20 s,we carry out the site soil classification of Yuxi-Jiangchuan-Tonghai-Basin in Yunnan Province,China,according to China rule of site soil classification. Compared with " real results" of comprehensive probe,the results showed that:( 1) Wald and Allen topographic slope method distinguished the region of the medium-hard soil ZYⅡ and the medium-soft soil ZRⅢ,it is a little similar to the " real situation" qualitatively.( 2) Relative to stable block hypothesis,it is more consistent with the actual situation if considering Yuxi region as active block.( 3) This method does not distinguish the soft soil RRⅣ area,the significant,large differences exist quantitatively in the results versus the " real situation". As a result,there are limitations when this method is applied to site soil classification of the deep and complex sedimentary basin.
引文
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