碳纤维基EICP矿化砂土渗—力学特性试验研究  

Experimental Study on Permeation-mechanical Properties of Carbon Fiber Based EICP Mineralized Sand Soil

作　　者：张鹏[1] 孙忠平 陶志刚[2] 成亮 吕启航 王亚文 郑俊杰 霍守东 李慧茹 ZHANG Peng;SUN Zhongping;TAO Zhigang;CHENG Liang;LÜQihang;WANG Yawen;ZHENG Junjie;HUO Shoudong;LI Huiru(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Environment and Safety Engineering,Jiangsu University,Zhenjiang 212013,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China;Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029,China;Institute of Science and Technology,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]江苏大学环境与安全工程学院,江苏镇江212013 [4]武汉大学土木建筑工程学院,湖北武汉430072 [5]中国科学院地质与地球物理研究所,北京100029 [6]中国矿业大学(北京)科学技术研究院,北京100083

出　　处：《金属矿山》2023年第5期325-332,共8页Metal Mine

基　　金：国家自然科学基金面上项目(编号:42177167);山东省自然科学基金项目(编号:ZR2019QEE008)。

摘　　要：基于微生物诱导碳酸盐沉淀法(MICP)、脲酶诱导碳酸盐沉淀法(EICP)的土体固化是近年来岩土工程领域兴起的绿色环保地基处理技术,相较于MICP法,EICP法处理工程地质问题时,不易受环境因素的制约,且成本更低廉。针对EICP法改进砂土的渗—力学特性,开展了一系列试验研究工作。采用碳纤维加强法开展了EICP注浆矿化试验,对砂土的孔隙率、渗透率、碳酸钙含量等指标进行了系统分析。试验结果显示,砂土中掺加碳纤维后,在EICP矿化作用下,CaCO_(3)晶体在纤维表面有不同的沉积情况,砂粒和纤维表面有不同程度粗糙化,砂粒间的空隙得以填充胶结。当碳纤维掺量为1.2%时,各方面性能达到最优。上述试验结果表明,碳纤维基EICP矿化法能够抑制砂土脆性破坏,提高砂土渗—力学性能,在“双碳”背景下,具有良好的应用前景和发展潜力。Soil solidification based on Microbial Induced Carbonate Precipitation(MICP)or Enzyme-induced Calcium Carbonate Precipitation(EICP)is a trendy green and environmentally friendly foundation treatment technology in the field of geotechnical engineering in recent years.Compared with the MICP method,the EICP method is not easily restricted by environmental factors when dealing with engineering geological problems and the cost is lower.In this paper,a series of experimental studies have been carried out to improve the seepage-mechanical properties of sandy soil by EICP method.The EICP grouting mineralization test was carried out by using the carbon fiber reinforcement method and the porosity,permeability,calcium carbonate content and other indicators of the sand were systematically analyzed.The test results showed that after adding carbon fiber to the sand,under the action of EICP mineralization,CaCO_(3) crystals have different deposition conditions on the surface of the fiber,the surface of the sand and the fiber are roughened to different degrees and the pores between the sand particles can be filled and cemented.When the content of carbon fiber is 1.2%,the performance in all aspects is optimal.The above test results show that the carbon fiber-based EICP mineralization method can inhibit the brittle failure of sand and improve the permeability-mechanical properties of sand.Under the background of"Dual Carbon",it has good application prospects and development potential.

关 键 词：EICP 砂土 碳纤维 渗—力学特性 

分 类 号：TU441[建筑科学—岩土工程]