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Water effects on rock strength and stiffness degradation

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Abstract

Reduction in strength and stiffness in rocks attributed to an increase in water content has been extensively researched on a large variety of rock types over the past decades. Due to the considerable variations of texture and lithology, the extent of water-weakening effect is highly varied among different rock types, spanning from nearly negligible in quartzite to 90 % of uniaxial compressive strength reduction in shale. Readers, however, often face difficulties in comparing the data published in different sources due to the discrepancy of experimental procedures of obtaining the water saturation state and how the raw laboratory data is interpreted. In view of this, the present paper first reviews the terminologies commonly used to quantify the amount of water stored in rocks. The second part of the paper reviews the water-weakening effects on rock strengths, particularly focusing on uniaxial compressive strength and modulus, as well as tensile strength, under quasi-static loading and dynamic loading. The correlation relationships established among various parameters, including porosity, density and fabric of rocks, and external factors such as strain rate, surface tension and dielectric constant of the saturating liquid, absorption percentage and suction pressure, are reviewed and presented toward the end of the paper.

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Acknowledgments

This research was supported by the Underground Technology and Rock Engineering (UTRE) Phase II research program funded by the Defence Science and Technology Agency (DSTA), and the Singapore Academic Research Fund Tier 1 Grant (RG112/14).

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Correspondence to Louis Ngai Yuen Wong.

Appendix 1

Appendix 1

See Table 8.

Table 8 Reduction in the mechanical properties of different rocks due to water saturation

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Wong, L.N.Y., Maruvanchery, V. & Liu, G. Water effects on rock strength and stiffness degradation. Acta Geotech. 11, 713–737 (2016). https://doi.org/10.1007/s11440-015-0407-7

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