Direct Shear Creep Characteristics of Sand Treated with Microbial-Induced Calcite Precipitation
Direct Shear Creep Characteristics of Sand Treated with Microbial-Induced Calcite Precipitation
复制标题
微生物诱导方解石沉淀处理砂的直剪蠕变特性
DOI：
10.1007/s40999-021-00696-8
复制
发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
Zhao Jitong
中科院分区：
文献类型：
--
作者：
Jie Yuan;Donglin Lei;Yi Shan;Huawei Tong;Xiaotian Fang;Zhao Jitong
微生物诱导方解石沉淀（MICP）是一种很有前途的改善岩土工程性能的方法。在这种情况下，对micp处理砂的蠕变行为进行的研究很少。因此，本工作进行了直接剪切蠕变试验，以研究在MICP处理下3次、6次和9次注浆的硅砂和钙质砂的蠕变相关力学特性。与未处理砂相比，3次和6次MICP处理的硅砂蠕变变形更为显著，9次MICP处理的硅砂蠕变变形减小了88.0%，说明MICP处理可以降低硅砂的蠕变变形。除3次灌浆后的蠕变变形与未灌浆钙质砂的蠕变变形相当外，经MICP处理的钙质砂的蠕变变形均大于未灌浆钙质砂，说明MICP处理可以增加钙质砂的蠕变变形。扫描电镜（SEM）图像表明，孔隙中微生物产生的碳酸钙在砂粒之间形成了联系，是影响micp处理后硅砂蠕变行为的关键因素。在钙质砂的情况下，空腔被碳酸钙填充，这减少了砂颗粒联锁结构的影响。
Microbial-induced calcite precipitation (MICP) is a promising method to improve geotechnical engineering properties. In this context, little research has been conducted on the creep behavior of MICP-treated sand. Therefore, the present work performed direct shear creep tests to investigate the creep-related mechanical properties of silica sand and calcareous sand grouted three, six, and nine times in the MICP treatment. Compared to the untreated sand, the creep deformation of the MICP-treated silica sand grouted three and six times was more significant, and the creep deformation of the MICP-treated silica sand grouted nine times decreased by 88.0%, indicating that the treatment of the silica sand with the MICP could reduce its creep deformation. The creep deformation of the MICP-treated calcareous sand was larger than that of the untreated calcareous sand except for the sample grouted three times which had a creep deformation equivalent to that of the untreated calcareous sand, implying that the treatment of the calcareous sand with the MICP could increase its creep deformation. The scanning electron microscopy (SEM) images demonstrated that the calcium carbonate produced by microorganisms in the voids formed a connection between the sand particles as the critical factor affecting the creep behavior of the MICP-treated silica sand. In the case of the calcareous sand, the cavities were filled up with calcium carbonate, which decreased the effect of the interlocking structure of the sand particles.
登录
查看更多内容
DOI：
10.1061/9780784480489.029
发表时间：
2017-03
期刊：
--
影响因子：
--
作者：
A. Zamani;B. Montoya
通讯作者：
A. Zamani;B. Montoya
考虑可破碎钙质砂变形机制的蠕变本构模型
影响因子：
--
作者：
Wang Yasong;Ma Linjian;Wang Mingyang;Lv Yaru;Dong Lu;Fan Pengxian
通讯作者：
Fan Pengxian
影响因子：
2.2
作者：
Zhaoyu Wang;N. Zhang;Y. Jin;Qi Li;Junhao Xu
通讯作者：
Zhaoyu Wang;N. Zhang;Y. Jin;Qi Li;Junhao Xu
影响因子：
2.3
作者：
Whiffin, Victoria S.;van Paassen, Leon A.;Harkes, Marien P.
通讯作者：
Harkes, Marien P.
DOI：
--
发表时间：
2008-06
期刊：
--
影响因子：
--
作者：
Victoria S. Whiffin
通讯作者：
Victoria S. Whiffin