摘要
开封地区在勘探深度50m范围内主要为第四系全新统和上更新统冲积地层,岩性主要为粉土、粉质粘土、粉砂、细砂和中砂,双桥静力触探在开封地区具有较为广阔的应用前景。选取开封地区3处典型地质成因的岩土工程勘察场地,结合静力触探试验结果、原位测试成果、土工试验结果以及钻孔揭示,研究了CPT测试技术在土分类中的应用,选取土分类指数法、铁路规范法等方法对3处场地CPT测试结果进行了辨识和分类,对比研究结果表明,采用土类指数进行土层分类较为合适,据此形成了适用于开封地区的基于CPT土分类指数的土分类方法,与工程勘察对比结果表明,该分类方法对开封地区CPT测试结果进行分类和辨识效果较好,研究结果可用于开封地区CPT测试结果辨识和岩土分类,促进双桥静力触探技术在该地区的应用和发展。
The strata in Kaifeng area is quaternary holocene and quaternary upper pleistocene alluvium within 50 m in depth.The main lithology is silt,silty clay,silty to medium sand.Cone penetration test is suitable in these strata.Three typical sites in Kaifeng area were selected,combined with the CPT results,in-situ test data,laboratory test results and borehole reveals the application of CPT technology in soil classification were studied.Different methods were used to identify and classify the CPT results,including the soil index classification and classification chart proposed in railway code.The comparison analysis shows that the soil behavior type index is more suitable for soil classification.A soil classification chart based on the soil index is proposed for the soils in Kaifeng area.Comparison results show that this classification chart could be used well to interpret the CPT data in Kaifeng area.The proposed classification chart could be used in geotechnical investigation.The CPT application in Kaifeng area could be promoted.
作者
周剑波
杨子跃
徐鹏
Zhou Jianbo;Yang Ziyue;Xu Peng(China Construction Third Bureau Engineering Design,Co.,Ltd.,Wuhan 430074,China)
出处
《工程勘察》
2020年第9期35-40,共6页
Geotechnical Investigation & Surveying
关键词
工程勘察
CPT测试
土类指数
土分类方法
engineering investigation
CPT measurement
soil property index
soil classification method
