基于微生物诱导碳酸钙沉淀技术加固珊瑚砂试验研究  

SHAKING TABLE TEST ON SEISMIC RESPONSE OF CORAL SAND FOUNDATION REINFORCED BY VIBROFLOTATION COMPACTION

作　　者：段志刚 王建平 黄瀚 杨佳 丁选明[2] DUAN Zhigang;WANG Jianping;HUANG Han;YANG Jia;DING Xuanming(Naval postgraduate School,Bejing 100091,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]海军研究院,北京100091 [2]重庆大学土木工程学院,重庆400045

出　　处：《工程地质学报》2024年第5期1518-1525,共8页Journal of Engineering Geology

摘　　要：微生物诱导碳酸钙沉淀技术(MICP)广泛应用于土木工程领域,为更好地了解微生物加固钙质砂场地的作用效果,本文通过采用低pH一相注浆加固的方法,开展对加固后的钙质砂场地的室内分析测试以及现场加载测试。通过钻孔取样开展了无侧限压缩试验、剪切波速试验以及扫描电镜试验。试验结果表明,在相同的加固条件下,碳酸钙沉淀作用形式不同将会导致较大的强度差异性;现场加载试验在微生物场地加固、养护结束后,且场地保持干燥时进行平板载荷试验,通过荷载板试验可以发现,当荷载逐渐增大时,承压板周边土开始出现裂缝延展,最终破坏时土体发生了较大的位移沉降和裂缝扩展,也证明了携带菌种现场扩培的方法在岛礁微生物加固中的可取性。Microbially induced calcium carbonate precipitation technology(MICP)is widely used in the field of civil engineering.In order to better understand the effect of microbial reinforcement on the calcareous sand site,a low pH one-phase grouting method was adopted to carry out laboratory analysis tests and field loading tests on the reinforced calcrete sand site.The unconfined compression test,shear wave velocity test,and scanning electron microscope test were carried out through drilling sampling.The test results show that under the same reinforcement conditions,the different forms of calcium carbonate precipitation will lead to a large difference in strength.In the field loading test,the plate load test was carried out after the reinforcement and maintenance of the microbial site,and the site was kept dry.According to the plate load test,it was found that when the load gradually increased,the soil around the bearing plate began to crack and extend,and the soil mass experienced large displacement settlement and crack expansion during the final failure.It is also proved that the method of on-site expansion of carrying strains is desirable in microorganism reinforcement of islands and reefs.

关 键 词：微生物诱导碳酸钙沉淀技术(MICP) 钙质砂 室内分析测试 平板载荷试验 

分 类 号：P642.3[天文地球—工程地质学]