水泥改性废弃泥浆损伤模型及时间效应

doi:10.13229/j.cnki.jdxbgxb20210430

Abstract

Abstract:

Through the unconfined compressive strength test， the stress-strain curve， unconfined compressive strength， and elastic modulus of cement-modified slurry （CMS） were analyzed， and the time effect model of CMS elastic modulus was established. Based on damage mechanics， a particle swarm optimization （PSO） algorithm was used to identify random field parameters， a CMS mesoscopic random damage model was established， and a random field parameter time effect model was proposed. The results show that： ①the stress-strain curve of CMS is a softening curve， the optimal cement content is 20%， and the elastic modulus is a function of cement content and curing time. ②The mesoscopic random damage model can describe the stress-strain relationship of CMS， and the random field parameter λ has a functional relationship with the curing time. ③The macroscopic stress-strain characteristics of CMS can be explained from the perspective of meso-random damage through the damage variable D and strain evolution.

Key words: geotechnical engineering, cement-modified slurry（CMS）, unconfined compression strength（UCS）, elastic modulus, time effect, stochastic damage model

CLC Number:

TU447

Ping JIANG,Lin ZHOU,Tian-hao MAO,Jun-ping YUAN,Wei WANG,Na LI. Damage model and time effect of cement⁃modified waste slurry[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(12): 2874-2882.

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水泥掺量/%	无侧限抗压强度增长率 η
水泥掺量/%	7 d	14 d	28 d	56 d	90 d	120 d	150 d	180 d
5	0.38	0.71	1.00	1.33	1.63	1.72	1.73	1.78
10	0.55	0.81	1.00	1.12	1.42	1.45	1.49	1.52
15	0.59	0.83	1.00	1.21	1.32	1.41	1.44	1.48
20	0.53	0.81	1.00	1.13	1.27	1.34	1.36	1.37
25	0.65	0.80	1.00	1.17	1.34	1.39	1.42	1.47

Damage model and time effect of cement⁃modified waste slurry

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