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Shear Behavior of the Interface Between Rock and Cemented Backfill: Effect of Curing Stress, Drainage Condition and Backfilling Rate

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Abstract

In situ parameters, for example curing stress, drainage conditions as well as backfilling rate, have substantial effects on the geotechnical properties and stability of cemented paste backfill (CPB), which is an evolutive cemented soil mainly used for underground mine support. An in-depth knowledge of the shear characteristics of the interface between CPB and rock is important for the cost-effective and safe design of underground CPB structures. But, no studies to date have investigated the effects of curing stress, drainage conditions and backfilling rates on the shear characteristics of the interface between CPB and surrounding rock mass. Hence, an experimental study is performed to assess the influence of curing stress (0 kPa, 50 kPa, and 150 kPa), drainage conditions (drained and undrained) and backfilling rate (20 kPa/3 h, 30 kPa/3 h, and 40 kPa/3 h) of CPB on the shear characteristics (behavior, properties) of the interface between CPB and rock. It is found that higher curing stress and backfilling rate contribute to the shear strength development of the studied interface because of the increased effective stress and matrix suction at the interface. Moreover, in comparison to undrained condition, the drained condition contributes to the shear strength acquisition at the interface. The findings provide technical information for improving the stability analysis of backfill structures and are practically important for opening barricades and designing filling sequences.

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Acknowledgements

The China Scholarship Council (CSC), University of Ottawa, and the Natural Sciences and Engineering Research Council of Canada (NSERC) are gratefully acknowledged by the authors for their supporting and funding. Besides, great appreciation also goes to Dr. Liang Cui and Dr. Saifen Zheng for their kind help.

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  1. Department of Civil Engineering, University of Ottawa, 161 Colonel BY, Ottawa, ON, K1N 6N5, Canada

    Kun Fang & Mamadou Fall

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  1. Kun Fang
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Correspondence to Mamadou Fall.

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Fang, K., Fall, M. Shear Behavior of the Interface Between Rock and Cemented Backfill: Effect of Curing Stress, Drainage Condition and Backfilling Rate. Rock Mech Rock Eng 53, 325–336 (2020). https://doi.org/10.1007/s00603-019-01909-2

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