文献类型：期刊文献

英文题名：Study on the effect of stress path on the deformation and non-coaxial characteristics of modified iron tailings

作者：Jiang, Ping[1,2];Wang, Zhichao[1,2];Wang, Wei[1,2];Li, Na[1,2];Song, Xinjiang[1,3];Yu, Shimeng[2]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Key Lab Interact Soft Soil Fdn & Bldg Str, Lab Low Dimens Carbon Mat, Shaoxing 312000, Peoples R China;[3]Anhui & Huaihe RiverWater Resources Res Inst, Bengbu 233000, Peoples R China

年份：2024

卷号：422

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001299264900001)、、EI(收录号：20241215767188)、Scopus(收录号：2-s2.0-85187794792)、WOS

基金：This research was funded by National Natural Science Foundation of China (Grant number 52179107) and Zhejiang Province Natural Science Foundation of China (Grant number: LQ20E080005) .

语种：英文

外文关键词：Modified iron tailings; Stress path; Stability theory; Deformation characteristics; Non-coaxial characteristics

外文摘要：In order to study the deformation and non-coaxial characteristics of fiber cement modified iron tailing sand (FCIT) under different stress paths. The evolution law of the dynamic stress ratio (eta) on the cumulative deformation and non-coaxial angle of FCIT under different tension-compression amplitude ratios (alpha) was explored through hollow torsional shear tests. The deformation behavior of FCIT is analyzed by using the stability theory. The research results show that: 1) The increase of dynamic stress level will deepen the cumulative deformation of FCIT, while the increase of alpha will make the deformation mode of FCIT develop into bulging failure-shear failuretensile failure. 2) According to the development trend of cumulative strain and cumulative strain rate of FCIT, it can be divided into three stages: plastic stability, plastic creep and incremental collapse, and the cumulative strain rate development prediction model is established, and the prediction error distribution is within +/- 20%. 3) The stress path determines the non-coaxiality of FCIT to a certain extent, and the non-coaxial angle fluctuates and decreases with the increase of the principal stress direction angle. When alpha=0.125, the maximum and minimum values of the non-coaxial angle of FCIT are 1.5 rad and 0.4 rad respectively. 4) Cement hydration reaction generates calcium alumina and hydrated calcium silicate (C-S-H) to make FCIT structure more compact, fibermatrix interfacial connections more dense, and play a role in filling the pores.