Abstract
The clarification of the variation on the strength of the cemented paste backfill (CPB) under the coupling of multi-factor is the foundation of the CPB design of the mine. In this article, the physical and mechanical properties of the CPB under the coupling effect of curing time, solid content, and binder content were experimentally and theoretically investigated. The results show that 1) the increase in binder content can effectively increase the later strength of CPB. 2) A sensitivity parameter considering the span of multi-factor was constructed, indicating that the curing time has the greatest impact on the uniaxial compressive strength (UCS), and the variation in solid content has the least impact on it, which can be verified by the stress–strain curves. 3) Curing time and binder content can effectively change the stress evolution, which is reflected in reducing the strain corresponding to the peak stress, enhancing the characteristics of the peak stress and increasing stress drop. The results of this study aim to explain the essence of the influence of each factor on the mechanical behavior of CPB in the view of stress–strain evolution, which will help to better understand the mechanical characteristics of CPB and quantify the sensitivity of the mechanical properties to various factors.
Highlights
With the demands of social development and the rapid economic development, mining activities are becoming more and more active all over the world
A series of experiments and theoretical analysis were carried out to explore the law of the strength difference of the cemented paste backfill (CPB) under multi-factor coupling, quantify the sensitivity of the strength to multi-factor, and clarify the variation of stress evolution
The main conclusions are as follows: (1) Compared with the early strength, the increase in the binder content has a greater impact on the later strength of CPB
Summary
With the demands of social development and the rapid economic development, mining activities are becoming more and more active all over the world. Mechanical Characteristics and Stress Evolution management, mine environmental protection, and mine economic benefits, it has multiple advantages such as supporting goafs, increasing ore recovery rate, controlling surface subsidence, reducing tailings accumulation, and reducing tailings recovery costs (Wu et al, 2015; Sun et al, 2018) It is widely used in mining and management of mines all over the world (Ding et al, 2018; Jiang et al, 2018; Mu et al, 2019). UCS and electrical resistivity increased with increasing cement-to-tailing ratio, solid content, and curing time. XRD technology was used to analyze the formation mechanism of the CPB strength by consideration of curing time, solid content, and binder content, and the uniaxial compression test was carried out to measure the UCS of CPB. Mixing Water Deionized water was used as the mixing water to prepare the slurry to ensure that the components in the mixing water would not affect the test results
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