Influence of Rainfall-Induced Erosion on the Stability of Sandy Slopes Treated by MICP
Influence of Rainfall-Induced Erosion on the Stability of Sandy Slopes Treated by MICP
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DOI：
10.1155/2022/5105206
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发表时间：
2022-07
影响因子：
1.8
通讯作者：
Shihui Liu;K. Du;Kejun Wen;Catherine Armwood-Gordon;Lin Li
中科院分区：
文献类型：
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作者：
Shihui Liu;K. Du;Kejun Wen;Catherine Armwood-Gordon;Lin Li
作为一种环保技术，微生物诱导方解石沉淀（MICP）被广泛应用于改善土壤的工程性能。本研究的目的是研究降雨引起的侵蚀对 MICP 技术处理的沙质边坡稳定性的影响。通过目视观察、无侧限压缩等方法，研究了低浓度（0.25 M Ca）和高浓度（0.5 M Ca）MICP处理边坡的侵蚀规律、MICP处理和水泥处理试样的力学行为，以及降雨侵蚀对0.5 M Ca MICP处理和10%水泥处理边坡粗糙度的影响。 测试和粗糙度测试。对于0.25 M Ca MICP处理的样品，在降雨侵蚀试验开始后不久就发现表面侵蚀，而对于0.5 M Ca MICP处理的样品，在暴露于降雨24小时后，坡面保持完好。通过无侧限压缩试验，可以得出结论，0.5 M Ca MICP 处理实现了高强度，与 10% 水泥处理的砂相似。粗糙度测试结果表明，经过24小时降雨侵蚀后，0.5 M Ca MICP处理的坡面看起来比未侵蚀的表面更光滑。相反，10%水泥处理的边坡经过24小时的降雨侵蚀后，表面变得更加粗糙。这些结果表明，与水泥处理的砂质边坡相比，MICP处理过的砂质边坡对降雨侵蚀的抵抗力较低。
As an environmentally friendly technology, microbially induced calcite precipitation (MICP) is widely used to improve the engineering properties of soil. The goal of this study was to investigate the effect of rainfall-induced erosion on the stability of sandy slopes which were treated by MICP technology. The observation of the erosion pattern of low concentration (0.25 M Ca) and high concentration (0.5 M Ca) of MICP-treated slopes, the mechanical behaviors of MICP-treated and cement-treated samples, and the effects of rainfall-induced erosion on the roughness of 0.5 M Ca MICP-treated and 10% cement-treated slope were studied through visual observation, unconfined compressive tests, and roughness tests. For the 0.25 M Ca MICP-treated sample, surface erosion was found to occur soon after the start of the rainfall erosion test, while for the 0.5 M Ca MICP-treated sample, the slope surface remained intact after exposing to the rainfall for 24 hours. Through unconfined compressive tests, it can be concluded that the 0.5 M Ca MICP treatment achieved a high strength, which was similar to 10% cement-treated sand. The roughness test results showed that the surface of 0.5 M Ca MICP-treated slope looked smoother than the uneroded surface after 24-h rainfall-induced erosion. On the contrary, the surface of the 10% cement-treated slope became rougher after 24-h rainfall-induced erosion. These results indicated that the MICP-treated sandy slope had lower resistance against rainfall-induced erosion compared to the cement-treated sandy slope.