玄武岩纤维加筋黏土数值模拟及机理研究  

NUMERICAL SIMULATION AND MECHANISM OF BASALT FIBERREINFORCED CLAY

作　　者：高磊[1] 胡国辉[1,2] 秦仕伟 GAO Lei;HU Guohui;QIN Shiwei(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Economic and Technology Research Institute of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330072,China;China Electronic Research Institute of Investigation and Design,Xi an 710054,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,南京210024 [2]国网江西省电力有限公司经济技术研究院,南昌330072 [3]信息产业部电子综合勘察研究院,西安710054

出　　处：《工程地质学报》2021年第1期237-246,共10页Journal of Engineering Geology

基　　金：国家自然科学基金(资助号:51508159);中央高校基本科研业务费专项资金(资助号:2019B12914)。

摘　　要：为研究玄武岩纤维加筋黏土的力学特性及纤维加筋机理,采用ABAQUS有限元软件构建了玄武岩纤维加筋黏土数值分析模型,同时基于Python语言对ABAQUS建模进行了二次开发,按纤维与干土质量的百分比0、0.05%、0.10%、0.15%、0.20%、0.25%、0.30%、0.35%和0.60%,考虑了不同纤维长度和分布模式的影响,建立了一系列玄武岩纤维加筋黏土的无侧限抗压试验数值分析模型,并结合室内试验结果进行了对比验证,探讨了纤维加筋机理。结果表明:(1)采用筋土分离的方法,在ABAQUS中基于Python语言进行二次开发可实现纤维加筋土模型的简化建立,模拟结果与室内试验结果基本相符;(2)玄武岩纤维的掺入可以显著提高土体的无侧限抗压强度,并减少土体的侧向鼓胀变形量,纤维掺量、长度和分布模式对土体强度和侧向鼓胀变形量均具有一定影响;(3)纤维加筋机理与纤维在土体中的受力特征有关,通过对不同掺量、长度和分布模式的纤维在土体中受力特征的分析,可以解释其对土体力学特性的影响规律。In order to study the influencing factors and mechanism of basalt fiber-reinforced clay,the ABAQUS finite element software was used to establish the numerical analysis model of basalt fiber reinforced clay.The modeling was developed secondary based on Python language,according to the fiber percentage of dry soil mass 0,0.05%,0.10%,0.15%,0.20%,0.25%,0.30%,0.35%and 0.60%.The different fiber length and distribution modes were also considered.A series of unconfined compressive strength(UCS)models of basalt fiberreinforced clay were established,and combined with the laboratory test results.The fiber reinforcement mechanism was analyzed.The results show that:(1)Based on fiber and soil separation theory,the simplified establishment of fiber reinforced soil model can be realized based on development secondary by Python language,and the simulation results are basically consistent with the laboratory tests;(2)The addition of basalt fiber can significantly improve the unconfined compressive strength and reduce the lateral bulging deformation of soil,and the fiber content,length and distribution mode have certain effects on the soil strength and lateral bulging deformation;(3)The fiber reinforcement mechanism is related to the fiber mechanics characteristic in soil.The influence rules of different fiber content,length and distribution modes can be explained by fiber mechanics characteristic analysis.

关 键 词：玄武岩纤维 筋土分算 纤维加筋土 数值模拟 加筋机理 

分 类 号：P642.13+9[天文地球—工程地质学]