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Method for estimating physical and mechanical properties indexes of silt by CPT

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基于静力触探估算粉土物理力学性质指标的方法

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jul.2023, Vol.46 No.7: 972-977, 996

DOI: 10.3969/j.issn.1003-5060.2023.07.017

Authors

WU Daoxiang $ ^{1} $, GUO Jiacheng $ ^{1} $, YE Lei $ ^{1} $, ZHAO Huahong $ ^{2,3} $, WU Leilei $ ^{2,3} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Transport Consulting and Design Institute Co., Ltd., Hefei 230088, China; 3. Research and Development Center on Technology and Equipment for Energy Conservation and Environmental Protection of Highway Transport, Hefei 230088, China)

Abstract and Keywords

Abstract: In view of the fact that silt is a kind of soil layer with great difficulty in sampling and sample preparation, cone penetration test (CPT) was applied to determining the physical and mechanical properties indexes of soil layer combined with regional experiences. More than 200 geotechnical engineering investigation data of Huaibei Plain of Anhui Province were collected, and the arithmetic average, thickness weighted average and minimum average of specific penetration resistance $ (p_{s}) $ of silty soils in Huaibei Plain area were statistically calculated. Then, the statistical characteristics of these three statistical averages and common physical and mechanical properties indexes as well as the correlation between them were analyzed, and regression fitting analysis and tests were carried out one by one. The results show that there is no significant difference in the statistical characteristics of these three statistical averages, but the statistical characteristics of the physical and mechanical properties indexes are different; and accordingly, the correlation between these three statistical averages and each index and the regression fitting effect are also significantly different; except for water content and other moisture condition indexes, these three statistical averages are highly correlated with other commonly used physical and mechanical properties indexes, and the regression fitting effect is good; the correlation between the minimum average of $ p_{s} $ and the main physical and mechanical properties indexes is the

Keywords: cone penetration test(CPT); specific penetration resistance; physical and mechanical property index; silt; Huaibei Plain of Anhui Province; empirical formula

作者信息

吴道祥 $ ^{1} $，郭佳诚 $ ^{1} $，叶磊 $ ^{1} $，赵华宏 $ ^{2,3} $，吴磊磊 $ ^{2,3} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 安徽省交通规划设计研究总院股份有限公司，安徽合肥 230088；3. 公路交通节能与环保技术及装备交通运输行业研发中心，安徽合肥 230088)

摘要和关键词

摘要: 针对粉土类取样和制样难度较大的土层,文章利用静力触探(cone penetration test, CPT)比贯入阻力 $ p_{s} $数据,结合地区经验确定土层物理力学性质指标,通过收集整理安徽省淮北平原200余份工程勘察资料,统计计算淮北平原地区粉土 $ p_{s} $值的算术平均值、厚度加权平均值和最小平均值,分析 $ p_{s} $值3种统计平均值与各常用物理力学性质指标的统计学特征和相关性,并逐一进行回归拟合分析和检验。结果表明:安徽淮北平原粉土 $ p_{s} $值3种统计平均值的统计学特征无显著差异,而各物理力学性质指标的统计学特征各异;相应地,3种统计平均值与各指标之间的相关性和拟合回归效果也差异明显;除含水率等含水状态指标外,3种统计平均值与其余各常用物理力学性质指标具有高度相关性,回归拟合效果良好; $ p_{s} $值最小平均值与各主要物理力学性质指标的相关性最高,回归拟合效果最优。经显著性检验后,文中建议对于淮北平原粉土,可采用比贯入阻力最小平均值,按照文中建立的回归方程确定主要物理力学性质指标。

关键词: 静力触探(CPT)；比贯入阻力；物理力学性质指标；粉土；安徽淮北平原；经验公式

Funding

国家自然科学基金资助项目（41002117）；合肥工业大学产学研校企合作资助项目（W2019JSFW0733）

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