摘要
为了研究裂隙粗糙度对微生物诱导碳酸钙沉淀(Microbial induced calcite precipitation,MICP)过程的影响,本文使用含预制裂隙的类岩石试样进行MICP注浆实验,并拍照记录注浆过程,同时测量试样的波速变化及裂隙中充填的碳酸钙含量并计算产率。结果表明,随着裂隙粗糙度的增大,MICP注浆过程中浆液扩散范围增大,碳酸钙充填的均匀性,波速变化和碳酸钙产率均呈先上升后下降的趋势。试样波速最高提高了8.3%,碳酸钙产率最高可达82%。试验说明,裂隙粗糙度对MICP过程会产生影响,MICP在粗糙度适中的裂隙中会产生更好的效果。
In order to study the effect of fracture roughness on the microbial induced calcite precipitation(MICP) process,this paper used a rock-like sample with pre-formed fissures for MICP grouting experiments, and recorded the grouting process using a photographing device, meanwhile the wave velocities of sample were measured and the content of calcium carbonate filled in the crack was measured and the yield was calculated. The results showed that with the increase of fracture roughness, the diffusion range of the slurry increased during the MICP grouting process, and the uniformity of calcium carbonate filling, the change of wave velocity and the yield of calcium carbonate increased first and then decreased. The top sample wave velocity went up to 8.3% and the top yield of calcium carbonate was up to 82%. Which have shown that crack roughness has an effect on the MICP process, and MICP produces better results in cracks with moderate roughness.
引文
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