摘要
Grasselli模型可以用来计算具有三维形态特征节理岩体的剪切强度,但是Grasselli模型输入参数繁多,不易确定,且该模型不能体现剪胀角的物理意义。为了修正Grasselli模型,基于国内外节理岩体剪切强度的数据库,通过遗传程序(genetic programming,GP)分析该数据库,提出了可预测三维不规则节理岩体剪切强度的GP模型。该模型具有以下优点:(1)GP模型的剪切强度预测精度高于传统的Grasselli模型;(2)GP模型所需的输入参数比Grasselli模型少;(3)GP模型符合Mohr-Coulomb准则的形式,并体现了剪胀角的物理意义。
The Grasselli shear strength model can be used to calculate the shear strength of jointed rock mass with three-dimensional shape characteristics.However,some of the input parameters of the Grasselli model are difficult to be estimated,and the model cannot reflect the physical characteristic of shear dilation angle.In this research,the genetic programming(GP)technique is used to analyze the database of shear strength of jointed rock mass to propose a modified Grasselli model which can be used to predict the shear strength of three-dimensional irregular jointed rock mass.The proposed GP model has the following advantages:(1)the prediction accuracy of the GP model is higher than that of the traditional Grasselli model;(2)fewer input parameters are required by the GP model than that of the Grasselli model;(3)the GP model satisfying the Mohr-Coulomb form and can reflect the effects of dilation angle on the shear strength of jointed rock mass.
作者
刘健
黄华杰
沈佳轶
吕庆
张泽坤
Liu Jian;Huang Huajie;Shen Jiayi;Lv Qing;Zhang Zekun(Zhejiang Highway and Water Transportation Engineering Consulting Limited Liability Company,Hangzhou 310006,China;Ocean College,Zhejiang University,Zhoushan Zhejiang 316021,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《科技通报》
2021年第12期71-75,共5页
Bulletin of Science and Technology
基金
浙江省交通运输厅科技计划项目(2020060)
国家自然科学基金(51579137,41772287)
自然资源部浙江地质灾害野外观测研究站开放基金(ZJDZGCZ-2021)
作者简介
刘健(1971-),男,辽宁朝阳,硕士,正高级工程师,主要从事公路水运岩土工程咨询和管理工作。E-mail:173629609@qq.com。
