Advances of soil improvement with bio-grouting
Advances of soil improvement with bio-grouting
复制标题
DOI：
10.16285/j.rsm.2015.06.003
复制
发表时间：
2015-06-01
影响因子：
1.5
通讯作者：
Wang Xin
中科院分区：
文献类型：
--
作者：
Qian Chun-xiang;Wang An-hui;Wang Xin
作为胶结材料，水泥和化学浆液常用于土壤改良。但其高能耗、高污染排放和高成本限制了其应用。最近出现了一种新的土壤改良方法——生物注浆加固技术，它是基于微生物诱导方解石沉淀，通过向松散的沙子中注入细菌溶液和营养物，以达到将土壤颗粒结合在一起，改善其物理力学性能的目的。系统总结了生物灌浆处理土壤的室内和现场试验研究。讨论了生物处理土的工程特性、无损地球物理过程监测方法及影响改良效果的因素。研究结果表明，生物灌浆工艺扰动小、灌浆压力低、环境危害小，对改善土体的强度、刚度、抗液化性等工程特性的处理效果显著，在土体改良中具有广阔的工程应用前景。但是，生物处理土的耐久性和生物灌浆的经济性仍需进一步探讨和研究。
As cementing materials, cement and chemical grouts have often been used for soil improvement. However, high energy consumption, high-pollution discharge and high cost restrict their applications. A new soil improvement method, called bio-grouting reinforcement technology, has recently emerged, which is based on microbial induced calcite precipitation by injecting bacteria solution and nutrient into loose sand for the purpose of binding soil particles together and improving its physico-mechanical properties. Laboratory and field experimental studies of bio-grouting treated soils are systematically summarized. The engineering characteristics of bio-treated soils, non-destructive geophysical process monitoring method, and factors influencing the improvement effect are also discussed. The research results show that the bio-grouting process has many advantages such as small disturbance, low grouting pressure, less environmental harm, and remarkable treatment effect on improving the engineering properties of the soil (e. g. strength, stiffness, liquefaction resistance), which make it a broad engineering application prospect in soil improvement. However, the durability of bio-treated soils and economy of bio-grouting still need discussing and investigating further.