Experimental study of relationship between uniaxial compression strength and CaCO3 bonding strength of a biogrouted rock-like material

被引：0
作者：
Xiaohua Pan
机构：
[1] Nanjing University,School of Earth Sciences and Engineering
[2] China University of Mining and Technology,State Key Laboratory for GeoMechanics and Deep Underground Engineering
来源：
Environmental Earth Sciences | 2023年 / 82卷
关键词：
Rock-like material; MICP; Bioslurry; Biogrout; Acoustic emission (AE) technique;
D O I：
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学科分类号：
摘要：
Biogrout is a promising soil improvement method in which CaCO3 crystals are formed on sand grain surfaces with bonding effect through microbial induced calcium carbonate precipitation (MICP) process. One of the limitations of biogrout is that it is not effective to be applied to coarse sand, as a number of rounds of treatments are required to produce sufficient amount of CaCO3 in soil pore spaces. A new biogrouting method using biogrout containing bioslurry has been proposed to overcome this difficulty. Bioslurry contains pre-formed urease active CaCO3 crystals. The pre-formed CaCO3 crystals can quickly fill the soil pore spaces, and themselves are bonded together by the new CaCO3 crystals produced in the following MICP process. The mixture of the pre-formed CaCO3 crystals in bioslurry and the new CaCO3 crystals produced in the following MICP process provides another type of bonding effect among soil particles. The different bonding effect such as bonding strength results in different mechanical properties. The objective of this study is to investigate the micro-mechanisms of bonding strength improvement behind the use of different biogrouts as well as the relationship between the uniaxial compression (UC) strength and CaCO3 bonding strength based on a series of biogrouting experiments on varying sand. A new method to evaluate the bonding strength of biogrouted sand using the acoustic emission (AE) technique is proposed. By detecting AE hits and AE energy of bonding damages during a UC test, the relationship between AE energy and elastic strain energy that induces bonding damage is established. The experimental results indicate that the bonding strength of the specimen treated by biogrout containing bioslurry is weaker than that by pure biogrout, and the UC strength of biogrouted sand is primary controlled by the mean bonding strength. In general, the higher the mean bonding strength, the greater the UC strength.
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