马兰黄土液化特性及孔压模型参数研究  

Liquefaction characteristics and parameters of pore-water pressure model for Malan loess

作　　者：代言 邓龙胜[1,2] 毛伟 范文 李培[2,3] DAI Yan;DENG Longsheng;MAO Wei;FAN Wen;LI Pei(College of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,Shaanxi,China;Key Laboratory of Mine Geological Hazards Mechanism and Control,Xi'an 710054,Shaanxi,China;College of Civil Engineering,Chang'an University,Xi'an 710054,Shaanxi,China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]矿山地质灾害成灾机理与防控重点实验室,陕西西安710054 [3]长安大学建筑工程学院,陕西西安710054

出　　处：《地震工程学报》2023年第2期338-345,361,共9页China Earthquake Engineering Journal

基　　金：国家重点研发计划(2022YFC3003403);国家自然科学基金(42220104005,41877245)。

摘　　要：地震荷载作用下黄土的孔压增长特性、模型及参数是黄土场地液化评价的关键。文章以甘肃庆阳董志塬地区黄土为研究对象,通过不同土性和荷载条件下饱和重塑黄土的液化试验,对黄土的液化特征、典型孔压模型的适用性及参数的取值范围进行研究。研究表明动荷载作用下饱和重塑黄土孔压增长曲线主要分为三类,通过对比验证不同孔压模型对饱和重塑黄土孔压增长曲线的适用性,给出了适用性较好的孔压模型的参数取值范围,其中,Seed模型的参数α取值范围为1.09~1.84,A型曲线模型参数β取值范围为1.70~2.52,幂函数模型参数θ取值范围为1.13~1.75。根据陇西黄土孔压曲线对模型进行验证,结果表明模型的参数取值范围具有区域性,对于陇西黄土,Seed模型、A型曲线模型和幂函数模型的拟合参数取值分别为0.91、8.32和3.51。The growth characteristics of the pore-water pressure of loess and the associated models and parameters are important for evaluating the liquefaction of loess sites under seismic loads.In this paper,the liquefaction characteristics,applicability of typical pore-water pressure models,and value ranges of parameters for the loess in the Dongzhi tableland of Qingyang City(Gansu Province,China)were studied via a series of liquefaction tests under different soil properties and loading conditions.Three types of pore-water pressure growth curves of saturated remolded loess under dynamic loading have been discovered,and their applicability to various pore-pressure models is verified via a comparison,and the value ranges of parameters for models with better applicability are provided.The parameterαof the Seed model ranges from 1.09 to 1.84,parameterβof the A-type curve model ranges from 1.70 to 2.52,and parameterθof the power function model ranges from 1.13 to 1.75.The models are verified by the pore pressure curve of the loess in the Longxi area.Results reveal that the parameter range of these models has regional characteristics.For Longxi loess,the fitting parameters of the Seed model,A-type curve model,and power function model are 0.91,8.32,and 3.51,respectively.

关 键 词：黄土 动三轴试验 液化 孔压模型 拟合参数 

分 类 号：TU444[建筑科学—岩土工程]