微生物结合碳纤维加固钙质砂的高强度试验研究  

High strength test study on coral sand reinforced by microbe and fiber

作　　者：蒋钊 彭劼[1] 许鹏旭 卫仁杰 李亮亮[1] JIANG Zhao;PENG Jie;XU Pengxu;WEI Renjie;LI Liangliang(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Jiangsu Research Center for Geotechnical Engineering Technology,Hohai University,Nanjing 210098,P.R.China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏省岩土工程技术工程研究中心,南京210098

出　　处：《土木与环境工程学报（中英文）》2024年第5期64-73,共10页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51578214)。

摘　　要：为了研究微生物诱导碳酸钙沉淀(MICP)结合碳纤维固化钙质砂的效果及机理,先通过低轮次注浆试验探究碳纤维对MICP加固钙质砂效果的影响,并确定碳纤维的最佳掺量及长度,然后开展高轮次注浆试验,研究MICP胶结液无法再注入时的砂柱强度,通过试验结果对比和扫描电镜等分析,分析了微生物、碳纤维及钙质砂之间的作用机理。试验结果表明,掺加碳纤维能显著提高微生物加固钙质砂的强度。在低轮次注浆试验中,掺加碳纤维能有效提高碳酸钙的生成量及试样强度,纤维组的碳酸钙生成量比无纤维对照组提高了15%~34%,试样强度提高了135%~217%;高轮次注浆试验中,在MICP胶结液无法再注入砂柱的情况下,由于两组试样注浆轮次的差异,纤维组最终的碳酸钙生成量对比无纤维对照组减少了4%,试样强度提高了11%。In this paper,the effect and mechanism of microbial induced carbonate precipitation(MICP)combined with carbon fiber for curing calcareous sand were investigated.The effect of carbon fiber on the effect of MICP on the consolidation of calcareous sand was investigated by a low-round grouting test,and the optimal amount and length of carbon fiber was determined.Subsequently,high-round grouting tests were carried out to study the sand column strength when MICP consolidation fluid could no longer be injected.Through comparative analysis of experimental results and scanning electron microscopy(SEM),the interactions among microorganisms,carbon fibers,and calcareous sand were analyzed.The test results show that the addition of carbon fiber can significantly improve the strength of microbial reinforced calcareous sand.In the low-round grouting test,the addition of carbon fiber can effectively improve the calcium carbonate production and specimen strength,and the calcium carbonate production in the fiber group increase by 15%-34% and the specimen strength increase by 135%-217% compared with the control group without fiber.In high-cycle grouting tests,when MICP consolidation fluid could no longer be injected into the sand column,due to differences in the number of grouting cycles between the two groups,the final calcium carbonate generation of the fiber group decrease by 4% compared to the control group without fiber,while the specimen strength increase by 11%.

关 键 词：微生物诱导碳酸钙 钙质砂 碳纤维 地基加固 

分 类 号：TU441[建筑科学—岩土工程] TU411.3[建筑科学—土工工程]