CAJ | 학술논문

土的结构性是引起天然土和重塑土各项性质差异的最主要原因。基于考虑土体结构性影响的岩土工程方法和手段应代表岩土工程实践发展方向的这一认识，本文以建立海口原状红黏土的结构性本构模式为研究目标。在结构性定量化指标上，引入综合结构势的概念，建立岩土微结构、胶结作用与宏观力学效应之间的定量表达关系。通过对海口地区所取原状红黏土和相应重塑土进行等向固结排水试验和p＝常数的三轴压缩排水试验，分别定义应力型结构性参数和应变型结构性参数。同时发现两者相对于平均主应力存在着归一性化特性，能较好地描述海口原状红黏土的结构性。在此基础上对K-G模型进行了结构性的修正，并进行了数值模拟。结果显示，修正K-G模型能够定量描述海口红黏土的结构性，较好地反映原状红黏土的结构性及预测原状红黏土的应力应变关系。
토적결구성시인기천연토화중소토각항성질차이적최주요원인。기우고필토체결구성영향적암토공정방법화수단응대표암토공정실천발전방향적저일인식，본문이건립해구원상홍점토적결구성본구모식위연구목표。재결구성정양화지표상，인입종합결구세적개념，건립암토미결구、효결작용여굉관역학효응지간적정량표체관계。통과대해구지구소취원상홍점토화상응중소토진행등향고결배수시험화p＝상수적삼축압축배수시험，분별정의응력형결구성삼수화응변형결구성삼수。동시발현량자상대우평균주응력존재착귀일성화특성，능교호지묘술해구원상홍점토적결구성。재차기출상대K-G모형진행료결구성적수정，병진행료수치모의。결과현시，수정K-G모형능구정량묘술해구홍점토적결구성，교호지반영원상홍점토적결구성급예측원상홍점토적응력응변관계。
Soil structure is the main reason causing the differences between natural and remolded soils.The soil structure have impacts on methods and means of geotechnical engineering.This paper establishes a structural consti-tutive model of Haikou red clay.Based on structural quantitative indicators,the concept of comprehensive structure potential is introduced.It builds quantitative expression among geotechnical microstructure,cementation and macro-scopic mechanical effects.The stress typical structural parameter and strain typical structural parameter are defined. They are obtained through the isotropic consolidation test and p=constant shearing test respectively.Both parameters exist the normalized linearization relationship relative to average principal stress.The result can describe the Haikou undisturbed red clay structure.These parameters are used to modify the K-G model.A numerical simulation is car-ried out.Results showed that the modified K-G model can describe the structure of Haikou undisturbed red clay, and well predict the stress-strain relationship of undisturbed red soil.