基于分数形导数的海陆相交互沉积土蠕变特性研究  

Creep Characteristics of Interactive Marine Terrestrial Deposit Soil Based on Fractal Derivative

作　　者：高鲁超 陈合德 何子睿 华新 胡川开 GAO Luchao;CHEN Hede;HE Zirui;HUA Xin;HU Chuankai(School of Civil Engineering,Southeast University,Nanjing 211189,Jiangsu,China;Zhejiang Jiaoke EngineeringTest Co.,Ltd.,Hangzhou 311200,Zhejiang,China;Ducheng Weiye Group Co.,Ltd.,Beijing 100020,China;China Design Group Co.,Ltd.,Nanjing 210014,Jiangsu,China)

机构地区：[1]东南大学土木工程学院,江苏南京211189 [2]浙江交科工程检测有限公司,浙江杭州311200 [3]都城伟业集团有限公司,北京100020 [4]华设设计集团股份有限公司,江苏南京210014

出　　处：《重庆交通大学学报（自然科学版）》2022年第12期120-127,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家电网鲁能集团有限公司科技项目(52980018000N);国家自然科学基金面上项目(52078128)。

摘　　要：海陆相交互沉积土是在复杂沉积环境下形成的,其蠕变性质不同于其他沉积土。基于分数形导数理论,利用分数形黏壶替代经典Newton黏壶,建立了一种描述海陆相交互沉积土蠕变特性的分数形蠕变模型;开展宁波海陆相交互沉积土三轴固结排水蠕变试验,分析沉积土的蠕变变形和应力-应变关系,并利用宁波和大连沉积土蠕变试验结果,对比分数形蠕变模型和经典元件模型。计算结果表明:宁波沉积土蠕变变形具有明显的非线性特征;相比经典元件模型,分数形蠕变模型更适用于描述海陆相交互沉积土的蠕变变形,具有精度高、参数少的特点,且该模型可有效表征沉积土加速蠕变变形阶段。研究成果可为分析海陆相交互沉积土的蠕变特性提供理论参考。Interactive marine terrestrial(IMT) deposit soil is formed in the complex depositional environment, and its creep characteristics are different from other deposit soils. By substituting the Newton dashpots with fractal dashpots, the fractal creep model was established to describe the creep characteristics of IMT deposit soils based on the theory of fractal derivative. The consolidation drained triaxial creep test of Ningbo deposit soils was employed to study the creep deformation and stress-strain relationship. Combined with the creep test results of deposit soils in Ningbo and Dalian, the fractional creep model and the classical element model were compared. The calculation results show that the creep deformation of Ningbo deposit soils has obvious nonlinear characteristics. Compared with the classical element model, the fractional creep model is more suitable for describing the creep deformation of IMT deposit soils, which has the characteristics of high accuracy and few parameters. Moreover, the fractal creep model can effectively characterize the accelerated creep deformation stage of deposit soil. The research results can provide a theoretical reference for the analysis of the creep characteristics of the IMT deposit soils.

关 键 词：岩土工程 分数形蠕变模型 三轴固结排水蠕变试验 海陆相交互沉积土 分数形导数 

分 类 号：TU446[建筑科学—岩土工程]