CAJ | 학술논문

堆石料是土石坝的主要填筑材料,其蠕变特性研究是土力学热点之一.蠕变试验的方法主要有三轴试验和单向压缩试验两种.三轴试验是研究堆石料常用的试验方法,其轴向变形主要是偏应力引起的剪切变形.而单向压缩试验,作为一种可以研究K_0状态下堆石料的蠕变特性的试验方法,目前对此的研究较少.应用大型三轴仪(Ф300 mm)和大型叠环式固结渗透仪(Ф500 mm),选用双江口堆石料,分别进行了堆石料的蠕变试验,成果表明两种蠕变试验的剩余蠕变量与时间的关系都可以采用幂函数准确表达.三轴试验成果验证了九参数蠕变模型的通用性,根据单向压缩试验成果提出了简单的经验公式.最后对两种试验成果进行了比较分析,发现单向压缩蠕变可以视为应力水平为0.4时的三轴蠕变,其不能反映应力水平对堆石料蠕变特性的影响.因此,要对堆石料进行蠕变研究,宜采用三轴蠕变试验.
퇴석료시토석패적주요전축재료,기연변특성연구시토역학열점지일.연변시험적방법주요유삼축시험화단향압축시험량충.삼축시험시연구퇴석료상용적시험방법,기축향변형주요시편응력인기적전절변형.이단향압축시험,작위일충가이연구K_0상태하퇴석료적연변특성적시험방법,목전대차적연구교소.응용대형삼축의(Ф300 mm)화대형첩배식고결삼투의(Ф500 mm),선용쌍강구퇴석료,분별진행료퇴석료적연변시험,성과표명량충연변시험적잉여연변량여시간적관계도가이채용멱함수준학표체.삼축시험성과험증료구삼수연변모형적통용성,근거단향압축시험성과제출료간단적경험공식.최후대량충시험성과진행료비교분석,발현단향압축연변가이시위응력수평위0.4시적삼축연변,기불능반영응력수평대퇴석료연변특성적영향.인차,요대퇴석료진행연변연구,의채용삼축연변시험.
Rockfill is the main material used in rockfill dams, and the research of creep properties is a focus of soil mechanics. The creep test mainly contains triaxial creep test and one-way compression creep test. The axial deformation of triaxial creep test is mainly caused by shear. Now it's lack of the compression creep test, which can study the K_0 condition creep. So the creep properties of rockfill are studied in laboratory by the triaxial apparatus (Φ300mm) and the compression apparatus(Φ500mm),the results show that the relationship of surplus creep and time both can be expressed accurately by power function. The versatility of nine parameter creep model is verified by triaxial creep test, and one empirical formula from compression test result is put forward. At last, the two creep methods are compared, it is found that the compressive creep test may regard as a triaxial creep test with stress level being 0.4, it can't reflect the influence of stress level, so researching the creep of rockfill suitably uses the triaxial creep method.