CAJ | 학술논문

对一定试验含水率及干密度下具有不同结构性(排列)的压实黄土试样进行无侧限压缩试验，依据非饱和及饱和压实黄土的应力–应变曲线，定义一个反映压实黄土结构性开始损伤前最大综合结构势的初始结构性参数，研究制样含水率引起的结构性变化对不同试验含水率压实黄土的应力–应变、强度特性及结构性参数的影响。研究结果表明：制样含水率对非饱和压实黄土的结构性及无侧限压缩特性有影响，影响程度随试验含水率的增大而减小，对饱和压实黄土基本没有影响；塑限是一个临界值，试验含水率小于塑限时，影响较大；试验含水率一定时，无侧限抗压强度及初始结构性参数皆随着制样含水率的增大而明显增大，制样含水率一定时，随着试验含水率的增大而明显减小；初始结构性参数可把以试验含水率为参量的无侧限抗压强度与制样含水率关系曲线簇转换为其与初始结构性参数之间的归一化非线性关系，它可以反映制样含水率及试验含水率变化对压实黄土结构性的影响，可以和粒度、密度指标一起合理地描述土的力学性质，具有很好的合理性、灵敏性。
대일정시험함수솔급간밀도하구유불동결구성(배렬)적압실황토시양진행무측한압축시험，의거비포화급포화압실황토적응력–응변곡선，정의일개반영압실황토결구성개시손상전최대종합결구세적초시결구성삼수，연구제양함수솔인기적결구성변화대불동시험함수솔압실황토적응력–응변、강도특성급결구성삼수적영향。연구결과표명：제양함수솔대비포화압실황토적결구성급무측한압축특성유영향，영향정도수시험함수솔적증대이감소，대포화압실황토기본몰유영향；소한시일개림계치，시험함수솔소우소한시，영향교대；시험함수솔일정시，무측한항압강도급초시결구성삼수개수착제양함수솔적증대이명현증대，제양함수솔일정시，수착시험함수솔적증대이명현감소；초시결구성삼수가파이시험함수솔위삼량적무측한항압강도여제양함수솔관계곡선족전환위기여초시결구성삼수지간적귀일화비선성관계，타가이반영제양함수솔급시험함수솔변화대압실황토결구성적영향，가이화립도、밀도지표일기합리지묘술토적역학성질，구유흔호적합이성、령민성。
A series of unconfined compression tests were conducted on compacted loess samples with different structures at the same dry density and experimental water content. Based on the stress-strain curves of unsaturated and saturated compacted loess,the initial quantitative parameter was defined to describe the maximum overall structure potential before the start of the structural damage of the compacted loess. The influence of different structures caused by the change of molding water content on the stress-strain and strength characteristics as well as the structural parameter was investigated for the compacted loess with different experimental water contents. The results indicated that the molding water content affected the structure and the unconfined compressibility of unsaturated compacted loess,but had little influence on that of saturated compacted loess. The degree of influence decreased with the increase of water content. The plastic limit was found to be the critical value. When the experimental water content was smaller than the plastic limit,the influence was greater. The unconfined compressive strength and the initial structural parameter increased notably with the increase of the molding water content at the same experimental water content and decreased significantly with the increase of experimental water content at the same molding water content. The group of curves describing the relationships of the unconfined compressive strength versus the molding water content and the experimental water content was normalized into a nonlinear relationship with the initial structural parameter. The normalized nonlinear relationship described the influence of molding water content and experimental water content on the structure of compacted loess. Together with the grain size and the density,it described reasonably the mechanical properties of compacted soil.