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微生物矿化胶结喀斯特岩石裂缝技术研究

作者：陈建国1，2，陈德伟3，韩伟栋4，杜念1，郑修宝4，杜佳兴5，顾业莲4，张春玲4

关键字：微生物,矿化,胶结,喀斯特,岩石,裂缝,技术,

　
（1.广西壮族自治区水利科学研究院，广西水工程材料与结构重点实验室，广西 南宁  530023；2.郑州大学 水利科学与工程学院，
河南 郑州  450001；3.江苏苏博特新材料股份有限公司，江苏 南京  211103；
4.河海大学 力学与材料学院，江苏 南京  211106）
    摘要：针对喀斯特地貌的岩石表面裂缝宽度约2 mm这一特性，开展了微生物诱导碳酸钙沉淀胶结裂缝的试验研究，并通过修复剂对不同岩缝宽度及粗糙度的岩样进行裂缝胶结修复。结果表明：修复7 d的试样其修复深度能达到5 cm以上，且裂缝宽度在2 mm以内的岩样均能够被较好地修复；岩缝表面越粗糙、岩缝宽度越小，试样的体积修复率越高。经微生物矿化修复的岩样抗压强度恢复率为47.57%~93.67%，最高抗压强度可达81.8 MPa。经微生物矿化修复的岩石渗透系数维持在10-7 cm/s数量级上。生成的沉淀物以方解石和球霰石2种物相的碳酸钙晶体为主，与岩石基体具有高度的相容性。
    关键词：微生物矿化；喀斯特岩石；岩缝修复；微生物修复剂
    中图分类号：TU57+.7        文献标识码：A        文章编号：1001-702X（2022）05-0123-06
 
Research on the technology of microbial mineralization and cementation of karst rock cracks 
CHEN Jianguo1，2，CHEN Dewei3，HAN Weidong4，DU Nian1，ZHEN Xiubao4，DU Jiaxing4，GU Yelian4，ZHANG Chunling4
（1.Guangxi Hydraulic Research Institute，Guangxi Key Laboratory of Water Engineering Materials and Structures，Nanning 530023，China；2.School of Water Conservancy Engineering，Zhengzhou University，Zhengzhou 450001，China；3.Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China；4.School of Mechanics and Materials，Hehai University，Nanjing，Jiangsu 211106，China）
    Abstract：Aiming at the characteristics of rock surface cracks（around 2 mm） in karst landforms，this paper carried out an experimental study on microbial induced calcium carbonate precipitation cemented cracks，and used a repair agent to determine the width and roughness of different rock fractures. The research results show that：the restoration depth of the sample after restoration for 7 d can reach more than 5 cm，and the rock samples with the crack width within 2 mm can be repaired well. It can be seen that the rougher the rock fracture surface and the smaller the rock fracture width，the higher the volume repair rate of the sample. The strength recovery rate of the microbial repaired rock sample is between 47.57% and 93.67%，and the highest strength can reach 81.8 MPa. The permeability coefficient of the rock repaired by microbial mineralization is maintained above the order of 10-7 cm/s. The formed precipitates are mainly calcium carbonate crystals of calcite and vaterite，which are highly compatible with the rock matrix.
    Key words：microbial mineralization，karst rock，rock fracture repair，microbial repair agent