基于D-P准则的改良土体强度的分析研究  

Strength Prediction of the Modified Soil Using on D-P Criterion

作　　者：王晓娇 周理安[2] 戚承志[2] 陈昊祥 焦伟玲 林坤 WANG Xiaojiao;ZHOU Li’an;QI Chengzhi;CHEN Haoxiang;JIAO Weiling;LIN Kun(Aviation Industry Corporation Construction Group Co.Ltd.,Beijing 101407;Beijing University of Civil Engineering and Architecture,Beijing 100044;Fuzhou Planning and Design Research Institute Group Co.Ltd.,Fuzhou 350108)

机构地区：[1]中航建设集团有限公司,北京101407 [2]北京建筑大学,北京100044 [3]福州市规划设计研究院集团有限公司,福州350108

出　　处：《土工基础》2024年第6期1000-1005,共6页Soil Engineering and Foundation

基　　金：国家自然科学基金项目(5160082245);国家自然科学基金项目(51774018);北京建筑大学2021年研究生创新项目资助(PG2021007)。

摘　　要：建筑垃圾是我国现阶段存量和产生量均巨大的废弃资源,面临着拓展应用范围的实际需要,通过掺加建筑垃圾再生微粉的方法来提高土体强度,具有很好的应用价值。基于改良土体无侧限抗压强度和直剪试验,结合Drucker-Prager破坏准则,利用ABAQUS二次开发平台,开发了岩土用户材料子程序UMAT。在二次开发平台中对试验的改良土体的强度进行了预测分析,研究分析中间主应力、拉应力和静水压力对土体力学性能的影响考虑不足的情况。将二次开发平台中的预测结果与岩土试件的无侧限抗压试验结果进行对比验证,获得适合的再生微粉掺量可提高土体强度。结果表明:当再生微粉掺量为15%时可有效提高土体强度,并且二次开发程序可以很好地描述与预测改良土的力学性能,可以为建筑垃圾再生材料在生土工程中的应用提供了一定指导。The reinforcement of geotechnical materials plays an important role in the durability and safety of buildings.The construction waste is a huge,wasted resource and is currently largely produced in China.To improve the strength,the recycled powder construction waste is added to the soft soil.Based on the unconfined compressive strength test and the direct shear test of modified soil,re-developed constitutive model that combined with Drucker-Prager criterion is established by using platform ABAQUS platform.The geotechnical user material subroutine UMAT was used to predict the strength of the modified soil.The new constitutive model considers the influence of intermediate principal stress,the tensile stress and the hydrostatic pressure on the mechanical properties of the soil.The prediction results by the re-development platform are compared with the unconfined compression test results the soil specimens.Combined with the test and verification results,the appropriate amount of recycled powder was obtained to improve the soil strength.The results show that,it is beneficial to increase the strength of soil when the content of reclaimed fine powder is about 15%.This subroutine command of ABAQUS can be used to describe and to predicte the mechanical properties of the modified soil well.

关 键 词：改良土体 DRUCKER-PRAGER准则 无侧限抗压强度 本构模型 

分 类 号：TU411[建筑科学—岩土工程]