CGM水泥基灌浆料力学特性及动态本构模型  

Mechanical properties and dynamic constitutive model of CGM cement-based grouting materials

作　　者：王晓虎 于崇[1] 邓守春 吴家骏 WANG Xiaohu;YU Chong;DENG Shouchun;WU Jiajun(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049

出　　处：《辽宁工程技术大学学报（自然科学版）》2024年第1期38-47,共10页Journal of Liaoning Technical University (Natural Science)

基　　金：国家重点研发计划项目(2020YFA0711802)。

摘　　要：为研究C-Type Grout Material(CGM)水泥基灌浆料力学特性,以及在动态加载条件下破坏失效规律,开展一系列静、动态力学测试,标定该材料Holmquist-Johnson-Cook(HJC)动态本构模型参数,基于LS-DYNA软件开展了Split Hopkinson Pressure Bar(SHPB)试验有限元动力模拟。实验结果表明:CGM水泥基灌浆料力学性质稳定,单轴受力条件下表现出明显的脆性,在有围压条件下加载具有显著的弹塑性,动态加载条件下率效应明显,应变率达到119 s^(-1)时,动态峰值强度可提高1.62倍。数值模拟结果表明:使用本文试验数据标定的HJC本构模型参数,可准确预测CGM水泥基灌浆料在不同应变率下破坏前的峰值应力和峰值应变,为该材料在动态冲击作用下应用提供参考依据。A series of static and dynamic mechanical tests were carried out to investigate the mechanical properties of C-Type Group Material(CGM)cementitious grout and the failure law of damage under dynamic loading conditions.On the basis of the tests,the parameters of the Holmquist-Johnson-Cook(HJC)dynamic principal structure model of the material were calibrated and finite element dynamic simulations of the Split Hopkinson Pressure Bar(SHPB)test were carried out based on LS-DYNA software.The test results show that the CGM cementitious grout is mechanically stable and exhibits significant brittleness under uniaxial stress conditions,significant elastoplasticity under loading with surrounding pressure and significant rate effect under dynamic loading conditions,When the strain rate reaches 119 s^(-1),the dynamic peak strength can be increased by 1.62 times.The numerical simulation results show that the peak stress and peak strain of the CGM cementitious grout before damage at different strain rates can be accurately predicted using the HJC constitutive model parameters calibrated from the test data,which provides a reference for the application of this material under dynamic impact.

关 键 词：CGM灌浆料 力学试验 HJC 参数标定 LS-DYNA软件 

分 类 号：TU318[建筑科学—结构工程]