基于CPTU测试的高速公路改扩建新老地基土工程特性评价研究

王蒙; 蔡国军; 刘文亮; 吴家铭; 刘松玉; 林军; 戴济群

doi:10.11779/CJGE2019S2021

基于CPTU测试的高速公路改扩建新老地基土工程特性评价研究 English Version

1. 东南大学岩土工程研究所,江苏南京 210000;
2. 中设设计集团股份有限公司,江苏南京 210000;
3. 南京水利科学研究院,江苏南京 210029

基金项目: 国家重点研发计划项目课题（2016YFC0800200）; 国家自然科学基金项目（41672294,41877231,51578146）

详细信息

作者简介:
王蒙(1993— ),女,硕士研究生,主要从事原位测试CPTU技术与软土地基处理等方面的研究。E-mail: wm199320@163.com。

通讯作者:
蔡国军，E-mail：focuscai@163.com

计量
- 文章访问数: 278
- HTML全文浏览量: 7
- PDF下载量: 137
出版历程
- 收稿日期: 2019-04-29
- 发布日期: 2019-07-19

Evaluation of engineering characteristics of new and old soft soil foundation based on advanced CPTU data

1. Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China;
2. China Design Group Co., Ltd., Nanjing 210096, China;
3. Nanjing Hydraulic Research Institute, Nanjing 210029, China

摘要

摘要: 软土地基上进行高速公路扩建项目面临着极大的挑战,必须对新老地基土体的工程特性进行全面的评价。传统室内试验方法会对土体产生扰动,而且时间长、成本大。孔压静力触探（CPTU）技术作为一种新型的原位测试方法,可以测试锥尖阻力、侧壁摩阻力与孔隙水压力等参数,而且具有多功能、连续性、高精度等优点,在国外得到广泛的应用。采用多功能CPTU技术对京沪高速公路扩建工程新老地基土体进行原位测试,基于承载力理论与孔穴扩张理论分别解译了新老地基土体的应力历史、变形与固结特性参数。研究发现：该方法可以更准确地确定软土层的分布、厚度和深度,可为进一步分析新老路基差异沉降的计算提供科学依据,更好地指导路基拼接相互作用与地基处理的设计和施工。
- 孔压静力触探 /
- 差异沉降 /
- 超固结比 /
- 压缩模量 /
- 固结系数
Abstract: The widening project of highways on soft soil foundation faces great challenges. It is necessary to evaluate the engineering characteristics of the new and old foundation soils comprehensively. The traditional methods in laboratory cause disturbance to the soils, which is long and costly. As a new in-situ testing technology, CPTU, can be used to obtain parameters precisely and continuously including cone tip resistance, sidewall friction and pore water pressure. The multi-functional CPTU technology is used to test the new and old foundation soils of the Beijing-Shanghai Expressway. Based on the bearing capacity theory and the cavity expansion theory, the parameters of the old and new foundation soils are interpreted, such as the stress history, deformation and consolidation. It’s found that the distribution, thickness and depth of soft soil layer can be more determined accurately. In addition, the above-mentioned important engineering parameters can be provided as the scientific evidences for the prediction of differential settlement of old roadbed and the design and construction of subgrade splicing.
- CPTU /
- differential settlement /
- over-consolidation ratio /
- compressive modulus /
- consolidation coefficient

HTML全文

参考文献(10)

[1]	高翔, 高速公路新老路基相互作用分析与处理技术研究[D]. 南京: 东南大学, 2006. (GAO Xiang.Research on the interaction between new and existing embankments and treatment techniques in highway widening engineering[D]. Nanjing: Southeast University, 2006. (in Chinese))
[2]	孙杰. 软土地基高速公路拼宽工程变形特性研究[D]. 南京: 河海大学, 2005. (SUN Jie.Study on the deformation features of widening of expressway on soft groundwork[D]. Nanjing: Hohai University, 2005. (in Chinese))
[3]	JIANG Xin, JIANG Yi, LIANG Xue-jiao, et al.Numerical simulation on deformation behaviors for widened expressway embankment over soft ground[J]. Journal of Rail Way Science and Engineering, 2015, 12(5): 1039-1046.
[4]	WANG Hao, HUANG Xiao-ming.Stress and deformation due to embankment widening with different treatment techniques[J]. Journal of Central South University of Technology, 2011, 18(4): 1304-1310.
[5]	蔡国军, 现代数字式多功能CPTU技术理论与工程应用研究[D]. 南京: 东南大学, 2010. (CAI Guo-jun.Study on theory and engineering application of digital multifunctional piezocone penetration test (CPTU)[D]. Nanjing: Southeast University, 2006. (in Chinese))
[6]	刘松玉, 蔡国军, 邹海峰. 基于CPTU的中国实用土分类方法研究[J]. 岩土工程学报, 2013, 35(10): 1765-1776. (LIU Song-yu, CAI Guo-jun, ZOU Hai-feng.Practical soil classification methods in China based on piezocone penetration tests[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 1765-1776. (in Chinese))
[7]	MAYNE P W.Determination of OCR in clays by piezocone tests using cavity expansion and critical state concepts[J]. Soils and Foundations, 1991, 31(2): 65-76.
[8]	SENNESET K, SANDVEN R, JANBU N.Evaluation of soil parameters from piezocone tests[J]. Transportation Research Record, 1989: 1235.
[9]	蔡国军, 刘松玉, 童立元, 等. 基于孔压静力触探的连云港海相黏土的固结和渗透特性研究[J]. 岩石力学与工程学报, 2007, 26(4): 846-852. (CAI Guo-jun, LIU Song-yu, TONG Li-yuan, et al.Study on consolidation and permeability properties of Lianyungang marine clay based on piezocone penetration test[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(4): 846-852. (in Chinese))
[10]	TEH C I, HOULSBY G T.Analytical study of the cone penetration test in clay[J]. Géotechnique, 1991, 41(1): 17-34.