Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (5): 1731-1739.doi: 10.16285/j.rsm.2018.0017

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Damage constitutive model and strength criterion of horizontal stratified cemented backfill

WANG Jie1, 2, SONG Wei-dong1, 2, TAN Yu-ye1, 2, FU Jian-xin1, 2, CAO Shuai1, 2   

  1. 1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2018-01-03 Online:2019-05-11 Published:2019-06-02
  • Supported by:
    The work was supported by the National Key Research and Development Program (2018YFC0604602) and the Fundamental Research Funds for the Central Universities (FRF-BD-18-006A).

Abstract: With horizontal slice backfilling of mines as the background, three concepts, namely initial stratified damage, loaded damage and total damage, were put forward for horizontal stratified cemented backfill. Based on the damage mechanics theory, the damage evolution model and the damage constitutive model were built with the consideration of the stratification effect. Based on the method of full differential function, a strength criterion of backfill, which considered the effect of stratified structure, was established. Then, tests to investigate the mechanical properties of backfills with different number of layers were conducted. Based on the results of tests, several conclusions can be drew. The theoretical curve of the damage constitutive model and the strength criterion fit the experimental results well, which verifies the correctness of the newly proposed models. The initial stratified damage increase at a quadratic polynomial function with the increase of the number of layers. The total damage of backfills is aggravated by the coupling effect of stratification and load. The total damage rate of backfill tends to firstly increase and later decrease. Before the peak, the total damage rate increases with the increase of the number of layers; after the peak, the total damage rate decreases with the increase of the number of layers, while the maximum of total damage rate increases with the increase of the number of layers.

Key words: backfill, stratification effect, initial stratified damage, damage constitutive model, strength criterion

CLC Number: 

  • TD 853
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