海洋土与钢桩界面剪切强度的大型直剪试验研究

闫澍旺; 林澍; 贾沼霖; 郎瑞卿

doi:10.11779/CJGE201803013

海洋土与钢桩界面剪切强度的大型直剪试验研究 English Version

闫澍旺¹,
林澍¹,
贾沼霖^1,2,3, ,,
郎瑞卿¹

1. 天津大学建筑工程学院,天津 300072;
2. 天津市软土特性与工程环境重点实验室,天津 300384;
3. 华电重工股份有限公司博士后科研工作站,北京 100070

基金项目: 国家自然科学基金项目（41272323,41372291）; 天津市软土特性与工程环境重点实验室科技成果转化项目（KJZH-CA3-1746）; 科技成果转化奖励资助项目

详细信息

作者简介:
闫澍旺(1949-),男,教授,博士生导师,主要从事岩土工程专业的教学和科研。E-mail：yanshuwang@tju.edu.cn。

通讯作者:
贾沼霖，E-mail：jzhaolin@126.com

计量
- 文章访问数: 323
- HTML全文浏览量: 5
- PDF下载量: 245
出版历程
- 收稿日期: 2016-02-24
- 发布日期: 2018-03-24

Large-scale direct shear tests on shear strength of interface between marine soil and steel piles

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
2. Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin, Tianjin 300384, China;
3. Huadian Heavy Industries Co., Ltd., Beijing 100070, China

摘要

摘要: 海洋工程中现行的桩-土界面剪切强度设计方法一般有两种：①根据工程经验与规范进行判断;②根据土层地质勘查报告中的土体强度参数进行判断。对于海洋桩基而言,合理地确定土-结构物界面的剪切强度尤为重要。界面剪切强度将直接影响桩基承载力的大小,过高或过低地估算桩基承载力都可能会造成严重工程事故发生。为了研究沉桩过程中桩-土界面特性,通过自制大型直剪仪对不同粒径的土样进行了直剪试验分析,提出“抗剪糙度”概念,研究了砂土的内摩擦角、相对密度和抗剪糙度三者之间的关系和黏土的抗剪糙度与不排水强度间的关系。研究表明,土与钢板界面的抗剪糙度并非常数,砂土抗剪糙度的变化规律性较强,而软黏土的抗剪糙度受固结程度、扰动程度、土体强度等因素影响而呈现较大变化。最后,对“抗剪糙度”在实际工程中的运用提出了一定的建议。
- 海洋工程 /
- 大直径 /
- 超长桩 /
- 界面强度 /
- 抗剪糙度
Abstract: There are two methods to decide the interfacial shear strength of pile-soil in ocean engineering design nowadays. One is taking the advices of engineering experience and codes, the other is calculation using the strength parameters of soils derived from geological exploration. As for the pile foundation in ocean, it is very important to reasonably estimate the interfacial shear strength of soil-structure, which will make a great difference to the pile bearing capacity. Both overestimation and underestimation of the pile bearing capacity may lead to severe engineering accidents. To study the characteristics of interface between piles and soils during pile driving, a large-scale direct shear apparatus is developed to perform the direct shear tests on soil samples with varied particle diameters. The shear-resistant coarseness between the soils and the surface of structures is introduced, and the relationships among internal friction angle, relative density and shear-resistant coarseness of sand samples are studied as well as the relationships between the shear-resistant coarseness and the undrained shear strength of cohesive soil samples. According to the results of the tests, the shear-resistant coarseness is variable, and the shear-resistant coarseness of sand changes more regularly while that of soft clay changes more greatly owing to the influences of consolidation, disturbance and strength of soils. Moreover, some advices are offered to the application of shear-resistant coarseness in practical engineering.
- ocean engineering /
- large diameter /
- super-long pile /
- interfacial strength /
- shear-resistant coarseness

HTML全文

参考文献(12)

[1]	POTYONDY J G.Skin friction between various soils and construction materials[J]. Géotechnique, 1961, 11(4): 339-353.
[2]	LINGS M L, DIETZ M S.The peak strength of sand-steel interfaces and the role of dilation[J]. Soils and Foundations -Tokyo, 2005, 45(6): 1-14.
[3]	MORTARA G, MANGIOLA A, GHIONNA V N.Cyclic shear stress degradation and post-cyclic behaviour from sand-steel interface direct shear tests[J]. Canadian Geotechnical Journal, 2007, 44(7): 739-752.
[4]	胡黎明, 濮家骝. 土与结构物接触面物理力学特性试验研究[J]. 岩土工程学报, 2001(4): 431-435. (HU Li-ming, PU Jia-liu.Experimental study on mechanical characteristics of soil-structure interface[J]. Chinese Journal of Geotechnical Engineering, 2001(4): 431-435. (in Chinese))
[5]	张嘎, 张建民. 循环荷载作用下粗粒土与结构接触面变形特性的试验研究[J]. 岩土工程学报, 2004(2): 254-258. (ZHANG Ga, ZHANG Jian-min.Experimental study on cyclic behavior of interface between soil and structure[J]. Chinese Journal of Geotechnical Engineering, 2004(2): 254-258. (in Chinese))
[6]	夏红春, 周国庆, 杜泽超. 土-地下结构界面层效应试验研究[J]. 中国矿业大学学报, 2011(6): 846-851. (XIA Hong-chun, ZHOU Guo-qing, DU Ze-chao.Experimental study of the soil-underground structure interfacial layer effect[J]. Journal of China University of Mining and Technology, 2011(6): 846-851. (in Chinese))
[7]	李永辉, 王卫东, 黄茂松, 郭院成. 超长灌注桩桩-土界面剪切试验研究[J]. 岩土力学, 2015(7): 1981-1988. (LI Yong-hui, WANG Wei-dong, HUANG Mao-song, GUO Yuan-cheng.Experimental research on pile-soil interface shear behaviors of super-long bored pile[J]. Rock and Soil Mechanics, 2015(7): 1981-1988. (in Chinese))
[8]	卢廷浩, 王伟, 王晓妮. 土与结构接触界面改进直剪试验研究[J]. 沈阳建筑大学学报(自然科学版), 2006(1): 82-85, 99. (LU Ting-hao, WANG Wei, WANG Xiao-ni. Experimental study on soil-structure contact surface behavior by improved direct shear tests[J]. Journal of Shenyang Jianzhu University (Natural Science), 2006(1): 82-85, 99. (in Chinese))
[9]	周凯, 程寅, 黄新. 不同桩-土界面直剪试验研究[J]. 路基工程, 2011, 5: 93-95, 99.(ZHOU Kai, CHENG Yin, HUANG Xin. Experimental study on direct shear of different pile-soil interface[J]. Subgrade Engineering, 2011, 5: 93-95, 99. (in Chinese))
[10]	TERZAGHI K.Theoretical soil mechanics[M]. New York: Wiley, 2007.
[11]	杨大方. 土与结构界面模型单剪与直剪试验对比研究[D]. 焦作: 河南理工大学, 2009. (YANG Da-fang.Comparison research between simple shear tests and direct shear tests on interfacial model between soil and structure[D]. Jiaozuo: Institutes of Technology of Henan, 2009. (in Chinese))
[12]	殷勇, 李富荣. 滨海土体与钢材接触面剪切特性试验[J]. 土工基础, 2014(6): 123-125. (YIN Yong, LI Fu-rong.The shear properties of the contact surface between steel and coastal plain soil[J]. Soil Engineering And Foundation, 2014(6): 123-125. (in Chinese))

施引文献(8)

期刊类型引用(6)

1.	张雄辉，黄孝福，黄诗渊，刘发贵，聂亮冰，黎子玄. 压剪条件下裂缝开闭对准脆性材料断裂行为的影响机制研究. 中国农村水利水电. 2025(03): 128-135 . 百度学术
2.	梁鹏，李壮，刘俊岭，王聚贤，王骏涛. 三点弯曲试验下花岗岩应变场及损伤演化研究. 地下空间与工程学报. 2023(02): 486-494 . 百度学术
3.	杨旭旭，吴岳，靖洪文. 基于超声波实测的巷道围岩裂缝扩展和强度演变规律研究. 采矿与安全工程学报. 2021(03): 528-537 . 百度学术
4.	张超，杨楚卿，白允. 岩石类脆性材料损伤演化分析及其模型方法研究. 岩土力学. 2021(09): 2344-2354 . 百度学术
5.	何泓易. Hoek-Brown强度准则在隧道围岩卸荷试验中的应用研究. 韶关学院学报. 2021(12): 19-23 . 百度学术
6.	王思，胡晶，张雪东，任晓丹，陈祖煜，张紫涛. 不同水深水下爆炸数值及离心试验研究. 哈尔滨工业大学学报. 2020(06): 78-84 . 百度学术