{"title":"淤泥均匀性对砂-淤泥混合物抗液化性能的影响","authors":"","doi":"10.1016/j.sandf.2024.101507","DOIUrl":null,"url":null,"abstract":"<div><p>Literature review revealed that effects of particle segregation and silt uniformity on the liquefaction resistance of sand–silt mixtures are not well understood. Therefore, cyclic direct simple shear tests were conducted to investigate effects of silt uniformity and stratified structures on the liquefaction resistance of sand–silt mixtures with 0%–40% fines content (<em>FC</em>). For all uniform sand–silt mixtures, as <em>FC</em> increased up to 20%, liquefaction resistance decreased, while it increased as <em>FC</em> increased from 20% to 40%. The liquefaction resistance of the samples with uniform silt only in the top and bottom layers was slightly higher than that of a uniform sample (<em>USM</em>), while the cyclic strength of the samples with silt concentrated in the middle layer was greater (up to 23%) than that of other nonuniform samples. <em>USM</em> exhibited the least liquefaction resistance. In addition, the number of silt layers (<em>NoSLs</em>) substantially affected the liquefaction resistance of stratified structures: as <em>NoSLs</em> increased from 1 to 3 layers, the cyclic resistance ratio was reduced by 20%, 10%, and 7% for <em>FC</em> values of 20%, 30%, and 40%, respectively. The liquefaction resistance of the stratified samples was greater than that of <em>USM</em>. To quantify the effect of silt uniformity and <em>NoSLs</em>, the nonuniformity index (<em>NUI</em>) was introduced herein; the calculated <em>NUI</em> values showed that the increase in liquefaction resistance was well correlated with the increase in the <em>NUI</em>.</p></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":null,"pages":null},"PeriodicalIF":3.3000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0038080624000854/pdfft?md5=7a612a407650476e3e677a2129ea3ebe&pid=1-s2.0-S0038080624000854-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Effect of silt uniformity on the liquefaction resistance of sand–silt mixtures\",\"authors\":\"\",\"doi\":\"10.1016/j.sandf.2024.101507\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Literature review revealed that effects of particle segregation and silt uniformity on the liquefaction resistance of sand–silt mixtures are not well understood. Therefore, cyclic direct simple shear tests were conducted to investigate effects of silt uniformity and stratified structures on the liquefaction resistance of sand–silt mixtures with 0%–40% fines content (<em>FC</em>). For all uniform sand–silt mixtures, as <em>FC</em> increased up to 20%, liquefaction resistance decreased, while it increased as <em>FC</em> increased from 20% to 40%. The liquefaction resistance of the samples with uniform silt only in the top and bottom layers was slightly higher than that of a uniform sample (<em>USM</em>), while the cyclic strength of the samples with silt concentrated in the middle layer was greater (up to 23%) than that of other nonuniform samples. <em>USM</em> exhibited the least liquefaction resistance. In addition, the number of silt layers (<em>NoSLs</em>) substantially affected the liquefaction resistance of stratified structures: as <em>NoSLs</em> increased from 1 to 3 layers, the cyclic resistance ratio was reduced by 20%, 10%, and 7% for <em>FC</em> values of 20%, 30%, and 40%, respectively. The liquefaction resistance of the stratified samples was greater than that of <em>USM</em>. To quantify the effect of silt uniformity and <em>NoSLs</em>, the nonuniformity index (<em>NUI</em>) was introduced herein; the calculated <em>NUI</em> values showed that the increase in liquefaction resistance was well correlated with the increase in the <em>NUI</em>.</p></div>\",\"PeriodicalId\":21857,\"journal\":{\"name\":\"Soils and Foundations\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.3000,\"publicationDate\":\"2024-09-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0038080624000854/pdfft?md5=7a612a407650476e3e677a2129ea3ebe&pid=1-s2.0-S0038080624000854-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Soils and Foundations\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0038080624000854\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, GEOLOGICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Soils and Foundations","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0038080624000854","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
Effect of silt uniformity on the liquefaction resistance of sand–silt mixtures
Literature review revealed that effects of particle segregation and silt uniformity on the liquefaction resistance of sand–silt mixtures are not well understood. Therefore, cyclic direct simple shear tests were conducted to investigate effects of silt uniformity and stratified structures on the liquefaction resistance of sand–silt mixtures with 0%–40% fines content (FC). For all uniform sand–silt mixtures, as FC increased up to 20%, liquefaction resistance decreased, while it increased as FC increased from 20% to 40%. The liquefaction resistance of the samples with uniform silt only in the top and bottom layers was slightly higher than that of a uniform sample (USM), while the cyclic strength of the samples with silt concentrated in the middle layer was greater (up to 23%) than that of other nonuniform samples. USM exhibited the least liquefaction resistance. In addition, the number of silt layers (NoSLs) substantially affected the liquefaction resistance of stratified structures: as NoSLs increased from 1 to 3 layers, the cyclic resistance ratio was reduced by 20%, 10%, and 7% for FC values of 20%, 30%, and 40%, respectively. The liquefaction resistance of the stratified samples was greater than that of USM. To quantify the effect of silt uniformity and NoSLs, the nonuniformity index (NUI) was introduced herein; the calculated NUI values showed that the increase in liquefaction resistance was well correlated with the increase in the NUI.
期刊介绍:
Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020.
Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.