Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (12): 2874-2882.doi: 10.13229/j.cnki.jdxbgxb20210430

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Damage model and time effect of cement⁃modified waste slurry

Ping JIANG1,2(),Lin ZHOU1,Tian-hao MAO1,Jun-ping YUAN2,Wei WANG1,Na LI1()   

  1. 1.School of Civil Engineering，Shaoxing University，Shaoxing 312000，China
    2.Key Laboratory of Geomechanics and Embankment Engineering，Ministry of Education，Hohai University，Nanjing 210098，China
  • Received:2021-05-13 Online:2022-12-01 Published:2022-12-08
  • Contact: Na LI E-mail:jiangping@usx.edu.cn;lina@usx.edu.cn

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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

Fig.1

Stress-strain curve"

Table 1

Unconfined compressive strength growth rate of CMS with different cement content"

水泥掺量/%无侧限抗压强度增长率 η
7 d14 d28 d56 d90 d120 d150 d180 d
50.380.711.001.331.631.721.731.78
100.550.811.001.121.421.451.491.52
150.590.831.001.211.321.411.441.48
200.530.811.001.131.271.341.361.37
250.650.801.001.171.341.391.421.47

Table 2

Theoretical value of CMS elasticmodulus"

水泥掺量/%弹性模量
7 d14 d28 d56 d90 d120 d150 d180 d
53.510192327312829
10516273245403733
15927374968676159
201740446483808474
2529455875101918675

Fig.2

Curves of elastic modulus with time"

Fig.3

Prediction-measured data correlation fit graph"

Fig.4

Relationship between curing time and parameter λ"

Fig.5

Comparison of CMS meso-random damage constitutive model and experimental result curve"

Fig.6

Mesoscopic damage evolution"

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