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華中科技大學學報(自然科學版) 2020, Vol. 48 Issue (10): 114-118 DOI10.13245/j.hust.201020

欄目:土木與環境工程
引入脲酶抑制劑的微生物固化砂土試驗研究
徐望清 , 鄭俊杰 , 崔明娟 , 宋 楊
華中科技大學土木工程與力學學院,湖北 武漢 430074
摘要 針對微生物固化試驗中常用的低速多次反復灌漿存在能耗及營養液浪費,且不能保證實現固化的均勻性等問題,引入一種脲酶抑制劑參與微生物固化的反應過程,并提出相應的灌漿方案.隨后將不同質量分數的抑制劑引入砂柱試驗作對比研究,結合無側限抗壓強度和固化生成物含量的結果分析,得出了抑制劑合適的質量分數,并在掃描電鏡下進一步觀察了生成物的微觀結構.結果表明:適量的脲酶抑制劑引入微生物固化過程中對反應結果有促進作用;其促進作用的效果在低質量分數區間會逐步上升,當脲酶抑制劑質量分數為0.1%時,作用效果相對較好,而當質量分數繼續增大至0.5%以上時會抑制固化反應的正常進行.
關鍵詞 微生物固化 ;脲酶抑制劑 ;質量分數 ;灌漿方法 ;無側限抗壓強度
Experimental study on microorganism solidifying sand with urease inhibitor
XU Wangqing , ZHENG Junjie , CUI Mingjuan , SONG Yang
School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China
Abstract Aiming at solving the problems such as energy consumption,wasting of nutrient solution and solidification uniformity being not guaranteed caused by the method commonly used in microorganism solidification tests,namely low-speed repeated grouting method,a urease inhibitor was introduced to participate in the reaction process of microorganism solidification and the corresponding grouting scheme was proposed.Then the inhibitors with different mass fraction were introduced into the sand column tests for comparative study.Combined with the results of unconfined compressive strength and solidified product content,the appropriate mass fraction of the inhibitor was obtained,and the microstructure of the product was further observed under scanning electron microscope.Results show that the introduction of urease inhibitor at an appropriate amount into the microorganism solidification process could promote the reaction results.This promoting effect will gradually increase in low mass fraction interval.When the mass fraction of urease inhibitor is 0.1%,the effect is relatively good,while when the mass fraction continues to increase to more than 0.5%,the normal solidification reaction will be inhibited.
Keywords microorganism solidification ; urease inhibitor ; mass fraction ; grouting method ; unconfined compressive strength
基金資助國家重點研發計劃資助項目(2016YFC0800200);國家自然科學基金資助項目(51708243,51878313)

中圖分類號TU 443
文獻標志碼A
文章編號1671-4512(2020)10-0114-05
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文獻來源
徐望清, 鄭俊杰, 崔明娟, 宋 楊. 引入脲酶抑制劑的微生物固化砂土試驗研究[J]. 華中科技大學學報(自然科學版), 2020, 48(10): 114-118
DOI:10.13245/j.hust.201020
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