微生物超声波振动注浆法加固饱和砂土的研究  

Study of the Micp Superaudible Vibration in Saturated Sandy Soils

作　　者：金炜枫[1] 张力友[1] 程泽海[1] 邓陈艳 

机构地区：[1]浙江科技学院岩土工程实验室,杭州310023

出　　处：《科技通报》2016年第5期177-179,共3页Bulletin of Science and Technology

摘　　要：微生物诱导碳酸钙沉淀(MICP)技术是岩土工程领域一项学科交叉性很强的新兴的地基处理技术。以往研究中,主要是通过蠕动泵低压循环把浆液输送至饱和砂土中,利用微生物诱导碳酸钙晶体胶结加固松散沙土颗粒,提高土体的力学性能。然而最近研究者发现:MICP工法的不同会影响碳酸钙的生成量及其对砂颗粒的胶结固化效果,从而影响砂土试样的强度及均匀性。基于微生物超声波振动注浆法加固饱和砂土的研究结果分析固化砂土式样的强度以及碳酸钙含量和微生物固化的微观结构观察,试验结果得出,微生物超声波振动注浆法加固饱和砂土试样的强度有显著提高(无侧限抗压强度平均值19.7),碳酸钙沉淀生成量有所提高,微观结构观察也表明沉淀分布比较均匀,更有利于砂土的加固。Microbial induced carbonate precipitation （MICP） technology is a discipline of geotechnicalengineering field strong emerging foundation treatment technology. In the past, The solution was alwaysthrough the peristaltic pump low pressure circulation to saturated sandy soil. utilizes the calciteprecipitation to bind loose particles together, therefore, the mechanical properties of sand can beenhanced. However recently , researchers have discovered that the method of different affects of theproduction of calcium carbonate and cement solidification effect of sand grains, they have great impact instrength and homogeneity of treated samples. In this study, the method of superaudible vibration that canbe seen in the strength modes and calcite content and microstructure , the conclusion of the test , Thestrength of the saturated sand samples have improved significantly for the method of superaudiblevibration , Calcium carbonate precipitation generation increased , Microscopic structure also shows thatthe precipitation distribution more uniform and More conducive to sandy soil reinforcement.

关 键 词：超声波振动 微生物诱导碳酸钙沉淀 蠕动泵低压循环 无侧限抗压强度 

分 类 号：TU441.8[建筑科学—岩土工程]