通过实地试验评价浮质矿床的液化潜力:以1987年埃奇库姆地震为例

Rolando P Orense, L. Wotherspoon, M. Pender, S. V. Ballegooy, M. Cubrinovski
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引用次数: 1

摘要

从工程角度来看,浮石材料是有问题的,在北岛中部广泛存在。考虑到2010-2011年基督城地震的影响,有必要清楚地了解它们在地震荷载下的特性。例如,1987年的埃奇库姆地震显示了火山砂局部液化的证据。为了阐明这一点,研究人员开展了一项研究,以调查现有的基于现场的经验方法来评估砂的液化潜力,这些方法最初是为硬颗粒土壤开发的,是否适用于可破碎的富浮石矿床。为此,选择了两个地点,一个在Whakatane,另一个在Edgecumbe,在Edgecumbe地震后报告发生液化。据报道,在这两个地点都有土壤液化的表现,如沙沸腾和喷出的物质。现场测试包括锥体穿透测试(CPT)、横波速度剖面和螺杆驱动测深(SDS)测试。然后,根据记录的运动和可能的地下水位位置范围,考虑场地的峰值地面加速度(PGAs),利用现有的经验方法对场地进行液化分析。为了澄清分析结果,在两个地点都获得了未受干扰的土壤样本,以调查实验室推导的循环阻力比,并与现场估定值进行比较。研究结果清楚地表明,这些富含浮石的土壤不适合现有的液化评估框架,需要替代方法来表征它们。
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EVALUATING LIQUEFACTION POTENTIAL OF PUMICEOUS DEPOSITS THROUGH FIELD TESTING: CASE STUDY OF THE 1987 EDGECUMBE EARTHQUAKE
Pumice materials, which are problematic from an engineering viewpoint, are widespread in the central part of the North Island. Considering the impacts of the 2010-2011 Christchurch earthquakes, a clear understanding of their properties under earthquake loading is necessary. For example, the 1987 Edgecumbe earthquake showed evidence of localised liquefaction of sands of volcanic origin. To elucidate on this, research was undertaken to investigate whether existing empirical field-based methods to evaluate the liquefaction potential of sands, which were originally developed for hard-grained soils, are applicable to crushable pumice-rich deposits. For this purpose, two sites, one in Whakatane and another in Edgecumbe, were selected where the occurrence of liquefaction was reported following the Edgecumbe earthquake. Manifestations of soil liquefaction, such as sand boils and ejected materials, have been reported at both sites. Field tests, including cone penetration tests (CPT), shear-wave velocity profiling, and screw driving sounding (SDS) tests were performed at the sites. Then, considering estimated peak ground accelerations (PGAs) at the sites based on recorded motions and possible range of ground water table locations, liquefaction analysis was conducted at the sites using available empirical approaches. To clarify the results of the analysis, undisturbed soil samples were obtained at both sites to investigate the laboratory-derived cyclic resistance ratios and to compare with the field-estimated values. Research results clearly showed that these pumice-rich soils do not fit existing liquefaction assessment frameworks and alternate methods are necessary to characterise them.
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CiteScore
2.50
自引率
17.60%
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14
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