微生物协同地毯草根系对热带土坡的加固作用  

Microbial Synergies with the Root System of Blanket Grass on theReinforcement of Tropical Soil Slopes

作　　者：刘静 苏永辉 苏进臣 李程喜 张友良 LIU Jing;SU Yong-hui;SU Jin-chen;LI Cheng-xi;ZHANG You-liang(School of Civil Engineering and Architecture,Hainan University,Haikou 570228,China;Hainan Provincial Water Conservancy and Hydropower Group Co.,Ltd,Haikou 570100,China)

机构地区：[1]海南大学土木建筑工程学院,海口570228 [2]海南省水利电力集团有限公司,海口570100

出　　处：《科学技术与工程》2025年第11期4713-4723,共11页Science Technology and Engineering

基　　金：国家自然科学基金(12262012);海南省科技专项(ZDYF2025SHFZ032);海南省院士创新平台科研项目(YSPTZX202320)。

摘　　要：因为海南省地处热带,经常受到台风暴雨等极端天气的侵袭,所以极容易发生边坡垮塌、滑坡等地质灾害,最终造成不可挽回的损失。为了能够以绿色环保的方式提高热带土质边坡的稳定性,选择通过微生物诱导碳酸钙沉淀(microbially induced carbonate precipitation, MICP)技术协同地毯草根系固坡的方法对边坡进行加固处理。研究中首先筛选出适宜的微生物菌株,并优化了相关菌剂的制备工艺。在室内对边坡土体进行地毯草根系植入,形成根土复合体后进行MICP处理。随后通过一系列的室内试验和数值模拟分析,评估了此种技术的加固效果。结果表明:MICP技术协同植物根系处理在边坡的力学脆性和整体性方面优势互补,且显著提高了土体的无侧限抗压强度和抗剪强度性能,有效增强了边坡的稳定性,减少了边坡被侵蚀的风险;最后利用Abaqus有限元软件进行了数值模拟验证,提高了研究结果的可靠性。可见,MICP协同地毯草根系加固方法为热带土质边坡提供了一种有效的加固手段,不仅提高了边坡的力学性能,还促进了生态恢复和环境的可持续性。本研究为热带地区边坡的生态加固提供了新的技术途径,对于保护生态环境、减少地质灾害风险具有一定的理论依据和实践意义。Because Hainan Province is located in the tropics,it is often hit by extreme weather such as typhoons and rains,so it is very prone to geological disasters such as slope collapse and landslides,which eventually cause irreparable losses.In order to improve the stability of tropical soil slope in a green and environmentally friendly way,the slope was strengthened by microbial induced calcium carbonate precipitation(MICP)technology and carpet grass root slope consolidation.Suitable microbial strains were first screened out,and the preparation process of related microbial agents was optimized.Subsequently,carpet grass root system was implanted in the slope soil indoors,and MICP treatment was carried out after the formation of the root-soil complex.Subsequently,a series of laboratory tests and numerical simulation analyses were carried out to evaluate the reinforcement effect of this technology.The results showed that MICP technology and plant root treatment complemented each other in terms of mechanical brittleness and integrity of slope,and significantly improved the unconfined compressive strength and shear strength performance of soil,effectively enhanced the stability of slope,and reduced the risk of slope erosion.Finally,the numerical simulation verification was carried out by using Abaqus finite element software,which enhanced the reliability of the research results.It can be seen that the MICP combined with carpet grass root reinforcement method provides an effective reinforcement method for tropical soil slopes,which not only improves the mechanical properties of slopes,but also promotes ecological restoration and environmental sustainability.This result provides a new technical approach for the ecological reinforcement of slopes in tropical areas,and has certain theoretical and practical significance for protecting the ecological environment and reducing the risk of geological disasters.

关 键 词：MICP 根土复合体 无侧限抗压强度 抗剪强度 数值模拟 

分 类 号：TU43[建筑科学—岩土工程]