CAJ | 학술논문

采用大型单剪仪进行粗粒料与混凝土接触面在混合土泥皮(膨润土中掺入水泥)条件下的剪切试验，揭示混合土泥皮条件下接触面的力学特性与机制。试验结果表明，存在混合土泥皮时，接触面表现出明显的剪胀及应力-应变软化现象。峰值强度以及发生剪胀所对应的剪应变与法向应力大小有关，相同法向应力下，峰值强度所对应的剪应变滞后于产生剪胀的位置。为反映接触面的这一变形特性，基于广义位势理论，建立考虑剪胀以及应变软化的接触面弹塑性本构模型。利用塑性状态方程取代传统屈服面，采用分段函数，对剪应力与剪应变关系曲线和法向应变与剪应变关系曲线均用双曲线函数以及似正态函数分别进行拟合，从而确定模型中的各个参数。结合部分试验结果表明，模型计算的剪应力与法向应变与试验值的误差分别在10.5%，12.7%以内，从而验证模型的合理性。
채용대형단전의진행조립료여혼응토접촉면재혼합토니피(팽윤토중참입수니)조건하적전절시험，게시혼합토니피조건하접촉면적역학특성여궤제。시험결과표명，존재혼합토니피시，접촉면표현출명현적전창급응력-응변연화현상。봉치강도이급발생전창소대응적전응변여법향응력대소유관，상동법향응력하，봉치강도소대응적전응변체후우산생전창적위치。위반영접촉면적저일변형특성，기우엄의위세이론，건립고필전창이급응변연화적접촉면탄소성본구모형。이용소성상태방정취대전통굴복면，채용분단함수，대전응력여전응변관계곡선화법향응변여전응변관계곡선균용쌍곡선함수이급사정태함수분별진행의합，종이학정모형중적각개삼수。결합부분시험결과표명，모형계산적전응력여법향응변여시험치적오차분별재10.5%，12.7%이내，종이험증모형적합이성。
The mechanical behaviors of the interface between coarse-grained soil and concrete are investigated by large-scale simple shear tests under conditions of mixed soil slurry(bentonite mixed with cement grout). The results indicate that phenomena of dilatancy and stress-strain softening are significant with presence of mixed soil slurry. The peak strength and the position where the dilatancy occurs are related to normal stress. The shear strain corresponding to the shear dilatation appears to be ahead of that corresponding to the peak value of shear stress under the same normal stress. In order to describe the interface deformation behavior,a elasto-plastic constitutive model of soil-structure interface in considering of dilatancy and strain softening is formulated in the framework of generalized potential theory;and plastic state equations are used to replace the traditional yield surface. The relation curves of shear stress and shear strain are fitted by a piecewise function composed by hyperbolic functions and resembling normal functions,as well as the relation curves of normal strain and shear strain. The entire model parameters can be identified by experimental tests. Combined with measured values,the maximum error between the results of shear stress and normal strain calculated by the model and the test values is within 10.5%and 12.7%respectively. So the validity of the model is verified.