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国际上已有比较成熟的基于原位孔压静力触探测试(CPTU)的土分类方法,这些方法多以美国统一土质分类标准(USCS)为依据,其土类与中国土的工程分类标准不对应。因此,建立基于CPTU原位测试参数、符合中国标准的土工程分类方法具有重要工程意义。通过选择江苏典型地质成因的试验场地,进行了95孔CPTU测试和相应的钻孔取样与室内土工试验,其CPTU孔和相应钻孔之间距离小于5 m,对采用室内土工试验依据中国国家标准《岩土工程勘察规范》得到的土分类和CPTU测试参数进行了系统对比分析。选择国外7种常用的CPTU土分类图进行应用比较,发现Robertson的土类指数法分类图能提供最好的分类结果,据此建立了中国基于CPTU土类指数法的实用土分类方法,已有测试资料应用表明该分类图的准确率达到95%以上,可用作为中国工程场地采用原位CPTU测试进行土工程分类的方法。
There are quite a few soil classification methods based on the CPTU in the world. Most of these methods are based on the United States Unified Soil Classification (USCS), and their soil and Chinese soil engineering classification standards Does not correspond. Therefore, the establishment of CPTU-based in situ testing parameters, in line with Chinese standards of soil engineering classification method has important engineering significance. By selecting the typical geological causes of Jiangsu test site, a 95-hole CPTU test and corresponding borehole sampling and indoor geotechnical test were conducted. The distance between the CPTU hole and the corresponding borehole was less than 5m. Based on the Chinese national standard Soil classification and CPTU test parameters obtained from “Geotechnical Investigation Standards” were systematically contrasted and analyzed. Choosing seven common CPTU soil classification maps abroad for comparison, we find that Robertson’s soil index method classification map can provide the best classification results. Based on this, we establish a practical soil classification method based on the CPTU soil index method in China, The application of test data shows that the accuracy of the classification map reaches more than 95%, which can be used as a method for geotechnical classification of in-situ CPTU tests in China’s construction sites.