Application of microbially induced calcium carbonate precipitation (MICP) in sand embankments for scouring/erosion control
Application of microbially induced calcium carbonate precipitation (MICP) in sand embankments for scouring/erosion control
复制标题
微生物诱导碳酸钙沉淀法在砂质路堤防冲防冲中的应用
DOI：
10.1080/1064119x.2020.1850949
复制
发表时间：
2020-12
影响因子：
2.2
通讯作者：
Zhaoyu Wang;N. Zhang;Y. Jin;Qi Li;Junhao Xu
中科院分区：
文献类型：
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作者：
Zhaoyu Wang;N. Zhang;Y. Jin;Qi Li;Junhao Xu
摘要我国沿海大部分地区的堤防在强降雨过程中极易受到冲刷和侵蚀。在这项研究中，微生物诱导碳酸钙沉淀（MICP）技术应用于砂填料的冲刷/侵蚀控制。首先使用喷射法制备了三个小规模MICP处理的砂路堤和一个未处理的路堤。在此基础上，进行了一系列的室内冲刷试验，研究了边坡的破坏过程。还测量了总侵蚀量、土壤脱落率和MICP诱导的碳酸钙（CaCO 3）含量，以评价MICP处理沙堤的效果。实验结果表明，随着MICP处理周期的增加，CaCO 3平均含量增加2%。与未处理的相比，MICP处理后的砂基复合材料的抗冲刷性能得到了显著提高。还利用扫描电子显微镜（SEM）技术进一步研究了MICP处理的微观机制。结果表明，在砂粒间的接触点形成了CaCO 3，增加了砂粒间的粘结强度，从而提高了处理后路堤的抗冲刷性能。本研究初步探讨了利用微冲淤技术减缓沿海地区砂堤冲刷的可行性。今后在实地实施时需要考虑更复杂的环境因素。
Abstract Embankment is vulnerable to scouring and erosion during heavy rainfall events in most coastal areas in China. In this study, microbially induced calcium carbonate precipitation (MICP) technique was applied for sand embankments for scouring/erosion control. Three small-scale MICP treated sand embankments and one untreated embankment were first prepared using the injection method. Then, a series of laboratory scouring/erosion experiments were performed to investigate the slope failure process. The total erosion mass, the soil detachment rate and the content of MICP induced calcium carbonate (CaCO3) were also measured to evaluate the effectiveness of MICP treatment in sand embankments. Experimental results revealed that the average CaCO3 content was increased by 2% with each increment of MICP treatment cycle. The anti-scouring/erosion performance of MICP treated sand embankments was significantly improved as compared to the untreated one. Scanning electron microscopy (SEM) technique was also used to further study the micro-mechanism of the MICP treatment. The results revealed that the MICP induced CaCO3 was formed at the contact points among sand grains that increased the bonding strength, resulting in an improvement of scouring/erosion resistance of the treated embankment. This study preliminarily investigates the feasibility of using the MICP technique to mitigate scouring/erosion of sand embankment in coastal areas. More complicated environmental factors need to be considered for field implementation in the future.