Rui Zhu, Feng Zhou, Xudong Wang, Xing Wei, Yaguang Deng
{"title":"Pore Water Pressure and Stress Changes During the Construction of Stiffened Deep Cement Mixing Piles","authors":"Rui Zhu, Feng Zhou, Xudong Wang, Xing Wei, Yaguang Deng","doi":"10.1007/s40999-024-00965-2","DOIUrl":null,"url":null,"abstract":"<p>Investigations on the changes in pore water pressures and stress during the construction of stiffened deep cement mixing (SDCM) piles are scarce, resulting in an unsatisfactory understanding of the bearing capacity formation process. Thus, this paper presents a preliminary field study to investigate the variation characteristics of pore water pressures, total stress and effective stress during the construction of SDCM piles derived from field tests. In the meantime, cone penetration tests (CPTs) were conducted before and after the construction of SDCM piles. The results show that the variation ranges of pore water pressure, total stress and effective stress of soils around piles decreased with increasing distance between the measuring point and piles when the depths of the measuring points were the same. During the piling process, the effective stress increased by approximately 53–103%, and the pile side frictions increased accordingly, while the tip resistance and side resistance values of soils around piles increased by 27–106% and 2–145%, respectively. Additionally, SDCM piles successively formed different load-bearing components with decreasing bearing capacity along the pile diameter direction, which realized a better bearing efficiency than conventional piles made with homogeneous materials. In essence, they were also the source of significant economic advantages of SDCM piles. Through this study, we expect to provide a reference for further studies on the bearing mechanism of SDCM piles in soft soil regions.</p>","PeriodicalId":50331,"journal":{"name":"International Journal of Civil Engineering","volume":"54 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Civil Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s40999-024-00965-2","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
Investigations on the changes in pore water pressures and stress during the construction of stiffened deep cement mixing (SDCM) piles are scarce, resulting in an unsatisfactory understanding of the bearing capacity formation process. Thus, this paper presents a preliminary field study to investigate the variation characteristics of pore water pressures, total stress and effective stress during the construction of SDCM piles derived from field tests. In the meantime, cone penetration tests (CPTs) were conducted before and after the construction of SDCM piles. The results show that the variation ranges of pore water pressure, total stress and effective stress of soils around piles decreased with increasing distance between the measuring point and piles when the depths of the measuring points were the same. During the piling process, the effective stress increased by approximately 53–103%, and the pile side frictions increased accordingly, while the tip resistance and side resistance values of soils around piles increased by 27–106% and 2–145%, respectively. Additionally, SDCM piles successively formed different load-bearing components with decreasing bearing capacity along the pile diameter direction, which realized a better bearing efficiency than conventional piles made with homogeneous materials. In essence, they were also the source of significant economic advantages of SDCM piles. Through this study, we expect to provide a reference for further studies on the bearing mechanism of SDCM piles in soft soil regions.
期刊介绍:
International Journal of Civil Engineering, The official publication of Iranian Society of Civil Engineering and Iran University of Science and Technology is devoted to original and interdisciplinary, peer-reviewed papers on research related to the broad spectrum of civil engineering with similar emphasis on all topics.The journal provides a forum for the International Civil Engineering Community to present and discuss matters of major interest e.g. new developments in civil regulations, The topics are included but are not necessarily restricted to :- Structures- Geotechnics- Transportation- Environment- Earthquakes- Water Resources- Construction Engineering and Management, and New Materials.