考虑颗粒破碎的砂土UH模型及其参数反演  

UH model and parameter inversion for crushable sands

作　　者：熊海斌 余虔 张升[1] 童晨曦 兰鹏 刘光庆 XIONG Haibin;YU Qian;ZHANG Sheng;TONG Chenxi;LAN Peng;LIU Guangqing(School of Civil Engineering,Central South University,Changsha 410075,China;China Airport Construction Group Corporation,Beijing 101312,China;Fujian Panport Airport Construction Co.,Ltd.,Xiamen 361000,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]民航机场规划设计研究总院有限公司,北京101312 [3]福建兆翔机场建设有限公司,福建厦门361000

出　　处：《岩土工程学报》2023年第1期134-143,I0009,共11页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52008402);湖南省自然科学基金项目(2021JJ40758);湖湘高层次人才聚集工程项目(2019RS1008)。

摘　　要：颗粒破碎对粒状土临界状态的影响十分显著,研究认为在e-lnp空间内,粒状土的临界状态线会随着破碎的进行向下漂移,而捕捉颗粒破碎量与临界状态线漂移量之间的一一映射关系是一项巨大的挑战。通过引入颗粒破碎参数eB对砂土UH模型进行了修正,并将其嵌入实数编码免疫遗传算法(RIGA)中,构建了RIGA-MUH模型,提出了可获取不同破碎程度下临界状态线的新方法。为得到更加准确的临界状态参数,模型通过调整粒状土临界状态下在误差函数中的权重比进行优化改进,并通过Toyoura砂和Cambria砂的常规排水三轴压缩试验结果,验证模型的稳定性、合理性和准确性。结果表明,该模型可以得到某一颗粒破碎量下精度较高的临界状态线,为提出考虑颗粒破碎的本构方程提供一种新方法。The effect of particle breakage on the critical state of granular soils is of great significance.The existing studies have shown that the critical state line(CSL) of granular soils in the e-lnp space shifts downward as a result of particle breakage.However,it remains a big challenge for capturing the degree of particle breakage and the movement of CSL.In this study,the UH model for sands is modified by introducing the particle breakage parameter e B and embedded in the real number encoding immune genetic algorithm(RIGA) to establish the RIGA-MUH model,which proposes a new method that can obtain the CSLs for the sands with varying particle-size distributions.The model is optimized and improved to obtain more accurate critical state parameters by adjusting the weight ratio in the error function under the critical state of granular soils.The stability,rationality and accuracy of the model are verified through the results of conventional drainage triaxial compression tests on the Toyoura sand and Cambria sand.The results show that the proposed model can be used to obtain the CSLs with high accuracy under a certain amount of particle breakage,which provides new insight into the constitutive modeling of crushable sands.

关 键 词：颗粒破碎 临界状态 UH模型 实数编码 免疫遗传算法 参数反演 

分 类 号：TU441[建筑科学—岩土工程]