Hydrological and spatial–temporal characteristics of three-level bridge foundation slope reinforced by BFRP anchors under rainfall conditions: a laboratory flume study
Hong Wei, Zhigang Tao, Manchao He, Honggang Wu, Kang Feng, Haijun Yu, Hanqian Weng
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引用次数: 0
Abstract
Basalt fiber-reinforced polymer (BFRP) anchors are increasingly utilized in geotechnical anchoring engineering; however, there remains significant potential for studying the erosion characteristics of the BFRP anchor-slope system under rainfall conditions. This paper investigated the hydrological and spatial–temporal characteristics of three-level bridge foundation slope (TLBFS) reinforced by BFRP anchors through laboratory rainfall experiments. An index (rill density \(\beta\)) was defined to quantify the degree of slope erosion. The experimental setup included a flume measuring 2 m in length, 1.2 m in width, and 1.5 m in height, a uniform rainfall intensity of 20.0 mm/h, and four sensors used for monitoring moisture content V, earth pressure E, anchor dynamometer T, and strain gauge S. The results indicated that the rill densities of third-level and first-level slopes after soil saturation were 2.37% and 0.98%, respectively. However, relying solely on the rill density index may lead to an overestimation of slope stability. Conversely, the high moisture content (25.72%) of the first-level slope correlated with its deformation and failure. It is proposed that the moisture content index can serve as a reliable indicator for evaluating slope stability. A strong correlation existed between moisture content \(\omega\) and erosion amount \(\delta\), which suggested that real-time monitoring of slope erosion can be conducted using the moisture content index. The damage to TLBFS resulted from the coupling of the internal and external factors, and the specific failure mode was identified as shallow slip. While the flexible reinforcement capabilities of BFRP anchors effectively mitigated slope deformation, but additional engineering measures need to be added to TLBFS. These findings provide valuable insights for soil and water conservation and disaster prevention in multi-level slopes.
玄武岩纤维增强聚合物（BFRP）锚杆在岩土锚固工程中的应用越来越广泛；然而，降雨条件下BFRP锚固边坡系统的侵蚀特性研究仍有很大的潜力。通过室内降雨试验，研究了BFRP锚杆加固三层桥基边坡的水文和时空特征。定义了一个指标（细沟密度\(\beta\)）来量化坡面侵蚀的程度。试验设置长2 m，宽1.2 m，高1.5 m的水槽，均匀降雨强度为20.0 mm/h， 4个传感器分别用于监测含水率V、土压力E、锚杆测力仪T和应变仪s。结果表明，土壤饱和后三级和一级边坡的细沟密度为2.37% and 0.98%, respectively. However, relying solely on the rill density index may lead to an overestimation of slope stability. Conversely, the high moisture content (25.72%) of the first-level slope correlated with its deformation and failure. It is proposed that the moisture content index can serve as a reliable indicator for evaluating slope stability. A strong correlation existed between moisture content \(\omega\) and erosion amount \(\delta\), which suggested that real-time monitoring of slope erosion can be conducted using the moisture content index. The damage to TLBFS resulted from the coupling of the internal and external factors, and the specific failure mode was identified as shallow slip. While the flexible reinforcement capabilities of BFRP anchors effectively mitigated slope deformation, but additional engineering measures need to be added to TLBFS. These findings provide valuable insights for soil and water conservation and disaster prevention in multi-level slopes.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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