邱明喜 刘汉银 明道贵 张家铭 朱纪康 周杨

摘 要：微生物诱导成矿是一种新型风积沙固结技术，相较于传统固沙技术具有显著优势。为探究其化学处理液浓度对微生物诱导成矿固结风积沙效果的影响，首先开展微生物矿化沉积试验与微生物诱导成矿固结风积沙试验并分析不同处理液浓度对碳酸钙产率的影响，其次通过力学性能测试对比风积沙力学强度及抗剪强度指标变化情况，最后结合颗粒粒径测试及微观形貌观测对不同化学处理方式的风积沙固结效果进行了分析。结果表明：微生物诱导成矿处理能有效提升风积沙力学性能，处理液浓度为0.9 mol/L时，力学强度改善最为显著，相对应的抗剪强度指标提升也最为明显;浓度为0.6 mol/L的处理液对应的微生物诱导成矿率（碳酸钙产率）最高，继续提高钙离子浓度不利于提升矿化沉积效率;微生物诱导成矿处理后的风积沙表面附着碳酸钙矿物，可把风积沙粒径变化作为一项反映矿化效果的指标。

关键词：风积沙;固沙效果;微生物诱导碳酸钙沉积;处理液浓度;力学性质;颗粒粒径

中图分类号：S157.9 文献标志码：A

doi：10.3969/j.issn.1000-1379.2021.08.021

引用格式：邱明喜，刘汉银，明道贵，等.化学处理方式对微生物固沙效果的影响[J].人民黄河，2021，43（8）：117-121.

Abstract： Microbial induced calcite precipitation is a new aeolian sand fixation technology， which has more significant advantages over traditional technology. To investigate the effect of chemical treatment on bio-cementation of aeolian sand， the experiment of calcium carbonate deposit generated by microbial induced calcite precipitation and the experiment of sand fixation by microbial induced calcite precipitation were firstly carried out to study the effects of different treatment methods on calcium carbonate yield. Then， the changes of mechanical strength and shear strength indexes of aeolian sand were compared through direct shear test. Finally， the sand fixation effects under different chemical treatment methods were analyzed by means of particle size analysis and microscopic morphology observation. The results show that microbial induced calcite precipitation can effectively improve the mechanical properties of aeolian sand. When the concentration of treatment solution is 0.9 mol/L， the improvement of mechanical strength is the most significant， and the corresponding shear strength index changes are also the most obvious. The microorganism corresponding to 0.6 mol/L treatment solution has the highest rate of mineral production， and the continuous increase of calcium ion concentration will not be conducive to the improvement of mineral deposition efficiency. Calcium carbonate minerals will adhere to the surface of aeolian sand treated by microorganism-induced mineralization， so the particle size change of aeolian sand can be taken as an index reflecting mineralization.

Key words： aeolian sand; sand-fixing effect; microbially induced calcite precipitation; treatment concentration; mechanical index; particle size

天然風积沙颗粒细小、粒间无黏聚力，易在风力吹蚀条件下快速移动[1]。传统风积沙固化材料包括机械固沙材料、化学固沙材料和生物固沙材料[2-3]：常用的机械固沙材料包括柴草、黏土、砾石……