土石坝心墙裂缝发展的扩展有限元模拟  

The XFEM on Clay Crack Extension in Core Wall of Earth Rockfill Dam

作　　者：赵晓龙 卞汉兵[3,4] 郑威[5] 孙兆辉 章赛泽 邱秀梅[3] ZHAO Xiao-long;BIAN Han-bing;ZHENG Wei;SUN Zhao-hui;ZHANG Sai-ze;QIU Xiu-mei(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering/Hohai University,Nanjing 210098,China;Geotechnical Research Institute/Hohai University,Nanjing 210098,China;College of Water Conservancy and Civil Engineering/Shandong Agricultural University,Tai'an 271018,China;LEM3 CNRS 7239,Universitéde Lorraine,Metz 57045,France;Xuzhou Water Conservancy Architectural Design and Research Institute,Xuzhou 221112,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]山东农业大学水利土木工程学院,山东泰安271018 [4]LEM3,CNRS 7239,洛林大学,梅兹法国57045 [5]徐州市水利建筑设计研究院,江苏徐州221112

出　　处：《山东农业大学学报（自然科学版）》2018年第2期192-198,共7页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：山东省重点研发计划(2017GSF16104);中央高校基本科研业务费专项资助项目(2017B651X14);江苏省研究生科研与实践创新计划资助项目(KYCX17_0475)

摘　　要：由于土石坝水力劈裂过程复杂,关于其发展机理目前仍有争议。无论是总应力法还是有效应力法都不能计算裂缝的扩展过程。为了进一步研究土石坝水力劈裂的发展机理,参照混凝土材料损伤模型的建模思路,根据土石坝水力劈裂中裂缝的形成过程,并结合非饱和土的力学特点,提出了压实黏土的孔隙扩展模型和裂缝张开模型,用来描述土样裂缝产生前后的状态。借助扩展有限元方法,对裂缝的扩展过程进行了数值模拟。最后通过一个简单的算例,验证了该方法的可行性。该方法对于水力劈裂的数值研究有一定的参考价值。There remains a controversial view on development mechanism of hydraulic fracture in earth rockfill dam due to its complexity.Both total stress method and effective stress method cannot calculate crack extension process.In order to study the development mechanism of hydraulic fracture further,a pore extension model and a crack extension model were proposed to describe soil state before and after the appearance of crack.These models were built according to modeling method of damage model of concrete material and crack formation process during hydraulic fracture in earth rockfill dam,combining with mechanical characteristics of unsaturated soil.Crack extension process was simulated numerically by extended finite element method(XFEM).Finally,the feasibility of this method was verified through a simple numerical example.This method has a certain reference value for numerical study of hydraulic fracture.

关 键 词：扩展有限元 裂缝扩展模型 土石坝 水力劈裂 数值模拟 

分 类 号：TU43[建筑科学—岩土工程]