Preliminary Analysis of Liquefaction During the Northridge Earthquake Using the Unit Energy Method

最近发生在加利福尼亚州洛杉矶的北岭地震对建筑物、道路、桥梁和其他土木工程和结构造成了广泛的破坏。 来自研究人员的新闻报道和通信表明，在几个地点有液化的证据。 在过去的二十年里，研究人员试图确定能够更好地定义土壤存款液化潜力和处理随机载荷的参数。 Seed和Idriss等人提出了一种通用方法，用于评估土壤存款的液化潜力，使用代表存款的各种参数，以及预期地震的震级和设计地震引起的剪应力。 最近，Figueroa、Saada等人在NSF资助的一个项目中，建立了施加到土壤直至液化的单位能量与砂土的有效围压、相对密度和剪切应变幅度之间的关系。 这些研究结果的基础上，开发一种新的方法来评估土壤存款液化潜力的单位能量的方法。 北岭地震期间观察到的液化提供了一个很好的机会，开始验证这种新的液化潜力评估方法，通过扭转剪切试验的土壤代表的位置，经历了这种现象，和地震记录的分析。 ***

9411018 Figueroa The recent Northridge earthquake in Los Angeles, CA generated extensive damage to buildings, roadway, bridges, and other civil engineering works and structures. News reports and communications from researchers indicated the evidence of liquefaction at several locations. Researchers have attempted to determine the parameters which could better define the liquefaction potential of a soil deposit and handle random loading during the past two decades. Seed and Idriss among others, proposed a general method for evaluating the liquefaction potential of a soil deposit using various parameters representative of the deposit, and the magnitude of the expected earthquake and the shear stresses induced by the design earthquake. More recently, Figueroa, Saada et al. in a project funded by NSF, established a relationship between the unit energy imparted to the soil up to liquefaction and the effective confining pressure, relative density and shear strain amplitude for a sand. These findings set the basis for the development of a new method for evaluating the liquefaction potential of a soil deposit using the unit energy approach. Liquefaction observed during the Northridge earthquake offers the great opportunity to initiate the validation of this new method of liquefaction potential evaluation through the torsional shear testing of soils representative of locations which experienced this phenomenon, and the analysis of earthquake records. ***