MICP加固页岩填筑体最优注浆间距试验研究  

Experimental Study on the Best Grouting Spacing of MICP Reinforced Shale Fill

作　　者：王德发[1] WANG Defa(China Railway 18th Bureau Group No.1 Engineering Co.,Ltd.,Zhuozhou 072750,Hebei,China)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《路基工程》2022年第4期119-122,共4页Subgrade Engineering

摘　　要：为摸清微生物诱导碳酸钙沉淀(MICP)技术大尺寸填筑体最佳灌浆间距及胶结深度,设计不同间距双孔灌浆模型试验,利用超声波检测技术研究不同间距双孔灌浆模型土体横向胶结距离及竖向胶结深度。试验结果表明:在灌浆过程中,填筑体模型超声波逐渐增大,不同灌浆间距模型各行测点波速变化趋势大致相同,且对经过20次灌浆循环得到的微生物注浆填筑体进行超声波检测,得到最优模型试验方案为灌浆孔间距10 cm,胶结深度13 cm。In order to ascertain the optimal distance between grouting and consolidation depth of large size filling body with the technology of microbially induced calcite precipitation(MICP),the model tests of double-hole grouting with different spacing have been designed,and the transverse cementation distance and vertical cementation depth of soil with different spacing have been studied by ultrasonic detection technology.Test results show that in the process of grouting,the filling model ultrasonic wave increases gradually,and the variation trend of wave velocity at all measuring points of different grouting spacing models is roughly the same,and the best model test plan has been obtained after 20 grouting cycles with 10 cm grouting hole spacing and 13 cm depth of cementation recorded.

关 键 词：微生物诱导碳酸钙沉淀(MICP)技术 双孔灌浆 最优间距 超声波速 土体加固 

分 类 号：U213.15[交通运输工程—道路与铁道工程]