台州滨海软黏土强度特性室内外联合标定

doi:10.16285/j.rsm.2023.0698

岩土力学 ›› 2023, Vol. 44 ›› Issue (10): 2851-2859.doi: 10.16285/j.rsm.2023.0698

台州滨海软黏土强度特性室内外联合标定

王宽君¹，贾志远²，沈侃敏¹，汤鄢³

1. 中国电建集团华东勘测设计研究院有限公司，浙江杭州 311122；2. 河海大学土木与交通学院，江苏南京 210098； 3. 浙江华东岩土勘察设计研究院有限公司海洋岩土工程勘察技术与装备浙江省工程研究中心，浙江杭州 310014

收稿日期:2023-05-30 接受日期:2023-07-17 出版日期:2023-10-13 发布日期:2023-10-16
通讯作者: 沈侃敏，男，1990年生，博士，高级工程师，主要从事海洋岩土工程方面的研究工作。E-mail: shenkanmin@163.com E-mail:steven_9090@163.com
作者简介:王宽君，男，1989年生，博士，高级工程师，主要从事软土工程、海洋工程原位测试等方面的研究工作。
基金资助:
国家自然科学基金（No.52108356，No.52101334）；浙江省自然科学基金（No.LQ20E090001）

Joint laboratory and in-situ calibration of strength characteristics for Taizhou coastal soft clay

WANG Kuan-jun¹, JIA Zhi-yuan², SHEN Kan-min¹, TANG Yan³

1. POWERCHIHA Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 311122, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Zhejiang Engineering Research Center of Marine Geotechnical Investigation Technology and Equipment, Zhejiang Huadong Geotechnical Investigation & Design Institute Corporation Limited , Hangzhou, Zhejiang 310014, China

Received:2023-05-30 Accepted:2023-07-17 Online:2023-10-13 Published:2023-10-16
Supported by:
This work was supported by the National Natural Science Foundation of China (52108356, 52101334) and the Zhejiang Provincial Natural Science Foundation of China (LQ20E090001).

摘要/Abstract

摘要：

我国滨海地区广泛分布有低强度、高压缩性软黏土，其工程特性评价对工程建设影响极大。孔压静力触探（CPTU）对土体扰动小，是目前最常用的原位测试方法之一。但是CPTU测试成果需要通过解译才可实现对土体力学特性的评价，不同地区存在地区特异性。针对台州滨海地区深厚软黏土场地，开展了孔压静力触探试验和室内试验，系统地研究了台州滨海软黏土的强度特征。基于重塑台州软黏土固结快剪试验，得到了台州软黏土的归一化强度与超固结比（OCR）的关系式，其应力历史及归一化土工程特性（SHANSEP）法经验系数a 为0.226，经验系数 b 为0.761；标定得到了台州软黏土的CPTU触探因子N _kt的范围为10.23～16.88，总平均值为14.08；基于SHANSEP公式和N_kt法解译得到的土体不排水抗剪强度s_u，获取了台州软黏土的原位超固结比OCR连续剖面；并标定得到了不同地层的OCR解译经验系数k的范围为0.315～0.570，建议采用k = 0.33对台州软黏土超固结比OCR进行解译。

关键词: 软黏土, 孔压静力触探, 超固结比, 联合标定

Abstract:

The soft clay with low strength and high compressibility is widely distributed in the coastal area of China. The engineering characteristics evaluation of soft clay is crucial for engineering construction. Piezocone penetration test (CPTU) is one of the most commonly used in-situ testing methods, which has slight disturbance on soil. However, the mechanical properties of the soil requires interpretation of CPTU test results, which is site-specific. This paper presents a study conducted in the Taizhou coastal area to investigate the strength characteristics of deep soft clay through CPTU and laboratory tests. Based on the direct shear test (consolidated quick shear) results of reconsolidated Taizhou soft clay, the relationship between the normalized strength and overconsolidation ratio (OCR) of Taizhou soft clay was obtained, where the empirical coefficients a and b of the stress history and normalized soil engineering properties (SHANSEP) method were determined to be 0.226 and 0.761, respectively. The cone factor N _kt of Taizhou soft clay were calibrated from 10.23 to 16.88, with a total mean value of 14.08. Utilizing the SHANSEP formula and the undrained shear strength s_u obtained by N _kt method, a continuous section of the in-situ OCR of Taizhou soft clay was derived. The interpretation empirical coefficient k of different strata OCR were calibrated from 0.315 to 0.570, a value of k = 0.33 was recommended for interpreting the OCR of Taizhou soft clay.

Key words: soft clay, piezocone penetration test, overconsolidation ratio (OCR), joint calibration

中图分类号: TU192

王宽君, 贾志远, 沈侃敏, 汤鄢. 台州滨海软黏土强度特性室内外联合标定[J]. 岩土力学, 2023, 44(10): 2851-2859.

WANG Kuan-jun, JIA Zhi-yuan, SHEN Kan-min, TANG Yan. Joint laboratory and in-situ calibration of strength characteristics for Taizhou coastal soft clay[J]. Rock and Soil Mechanics, 2023, 44(10): 2851-2859.

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台州滨海软黏土强度特性室内外联合标定

Joint laboratory and in-situ calibration of strength characteristics for Taizhou coastal soft clay

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