基于CPTU的宁波黏性土不排水抗剪强度确定研究

发布时间：2018-08-27 08:40

【摘要】：黏性土的不排水抗剪强度是黏性土的重要力学指标,对于地铁车站的设计是非常重要的。由于获得无扰动试样的困难或成本限制,现代原位测试技术已广泛用于不排水抗剪强度的评价之中。以宁波地铁车站为工程背景,采用多功能孔压静力触探技术(CPTU)对黏性土进行土层测试和评价。介绍了CPTU测试技术的基本原理;根据十字板剪切强度反演孔压圆锥系数(NΔu),提出了不排水抗剪强度与超静孔压的关系,并探讨了孔压圆锥系数与孔压参数比的关系;将基于CPTU测试技术的不排水抗剪强度与室内测试结果进行对比。结果表明,采用CPTU测试技术能有效地评价黏性土的不排水抗剪强度;基于十字板剪切试验的不排水抗剪强度与基于CPTU测试技术的超静孔压有着较好的相关性;孔压圆锥系数与孔压参数比有着较好的对应关系。
[Abstract]:The undrained shear strength of clay is an important mechanical index of clay, which is very important for the design of subway station. Due to the difficulty or cost limitation of obtaining undisturbed specimens, modern in-situ testing techniques have been widely used in the evaluation of undrained shear strength. Taking Ningbo subway station as the engineering background, the soil layer of clay soil was tested and evaluated by (CPTU). The basic principle of CPTU testing technique is introduced, the relationship between undrained shear strength and excess static pore pressure is put forward according to the inversion of hole pressure cone coefficient (N 螖 u),) of cross plate shear strength, and the relationship between pore pressure cone coefficient and pore pressure parameter ratio is discussed. The undrained shear strength based on CPTU is compared with the results of indoor test. The results show that the undrained shear strength of clay can be effectively evaluated by using CPTU test technique, and the undrained shear strength based on cross plate shear test has a good correlation with the super-static pore pressure based on CPTU test technology. The ratio of pore pressure cone coefficient to pore pressure parameter has a good correspondence.
【作者单位】：东南大学江苏省城市地下工程与环境安全重点实验室;东南大学交通学院岩土工程研究所;江西省公路工程监理公司;浙江省工程勘察院;
【基金】：国家自然科学基金项目(41330641;41202203) 全国优秀博士学位论文作者专项资金项目(201353) 江苏省杰出青年基金项目(BK20140027) 教育部新世纪优秀人才支持计划(NCET-13-0118) 中央高校基本科研业务费(2242013R30014)
【分类号】：TU442

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