Abstract The microbial induced carbonate precipitation (MICP) technique has been increasingly employed for ground improvement and fracture sealing, as well as for erosion mitigation and stabilization of sandy slopes. However, there is a lack of an effective assessment method to estimate the erosion resistance of biocemented sandy slope under wave actions. In this study, a series of bench-scale flume erosion tests was conducted on sandy slopes with and without MICP treatment under waves to quantitatively investigate the erosion resistance. Variables, including the MICP treatment cycle(0 ~ 4 cycles) and the slope angle (10°, 20°, and 35°), were explicitly considered. Penetration tests were conducted to measure the strength of biocemented sand at the slope surface. The calcite mass was calculated using theacid washing method to evaluate the level of cementation. Results show that the erosion resistance follows a nonlinear relationship with the penetration resistance. A fitting calculation was therefore carried out to evaluate the erosion process of MICP-treated sandy slope based on the results oferosion and penetration tests for use to assess the slope stability. A microstructure study also shows that there was interlocking cementation produced between sand particles in the sandy slope after MICP treatment,whichcontributed to the increase in erosion resistance ofsand.

中文翻译：

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波浪作用下生物胶结砂质边坡抗侵蚀性评价

摘要 微生物诱导碳酸盐沉淀（MICP）技术越来越多地用于地基改良和裂缝封闭，以及沙质边坡的侵蚀减缓和稳定。然而，目前还缺乏一种有效的评估方法来评估波浪作用下生物胶结砂质边坡的抗侵蚀性。在这项研究中，在波浪下对有和没有 MICP 处理的沙质斜坡进行了一系列台架规模的水槽侵蚀试验，以定量研究其抗侵蚀性。明确考虑了变量，包括 MICP 治疗周期（0~4 个周期）和倾斜角（10°、20° 和 35°）。进行渗透测试以测量斜坡表面生物水泥砂的强度。使用酸洗法计算方解石质量以评价胶结水平。结果表明，抗侵蚀性与抗渗透性呈非线性关系。因此，基于用于评估边坡稳定性的侵蚀和渗透试验结果，进行拟合计算以评估MICP处理的沙质边坡的侵蚀过程。微观结构研究还表明,MICP处理后的砂质边坡砂粒之间产生了互锁的胶结作用,有助于提高砂粒的抗冲刷能力。因此，基于用于评估边坡稳定性的侵蚀和渗透试验结果，进行拟合计算以评估MICP处理的沙质边坡的侵蚀过程。微观结构研究还表明,MICP处理后的砂质边坡砂粒之间产生了互锁的胶结作用,有助于提高砂粒的抗冲刷能力。因此，基于用于评估边坡稳定性的侵蚀和渗透试验结果，进行拟合计算以评估MICP处理的沙质边坡的侵蚀过程。微观结构研究还表明,MICP处理后的砂质边坡砂粒之间产生了互锁的胶结作用,有助于提高砂粒的抗冲刷能力。