Experimental study on hydraulic rock damage

DOI

10.2991/iccet-15.2015.271How to use a DOI?

Keywords

rock; hydraulic damage experiment; lateral crack strength;curve and equation; damage degree

Abstract

The mechanical properties of rock mass change significantly in water pressure , and causing coal-rock mass deformation and instability, then leading to significant engineering accident. Based on hydraulic damage experiment to explore the mechanical process that water pressure prompted crack propagation, so as to induce the damage evolution of rock mass, mechanical process to produce strength damage. The hydraulic damage experiment was carried out in the condition of various confining pressure and pore pressure, the corresponding confining pressure and pore pressure curves of rock were fitted out; And the damage degree of rock mass was defined basing on the lateral hydraulic strength, getting the lateral crack strength damage degree under different confining pressure, that reveals the uniformity between the hydraulic changing and the rock samples damage; the key points were interpolated in curve of the damage degree and the confining pressure the fitting equation of the damage degree and the confining pressure was got; The hydraulic rock damage experiment has important theoretical and practical significance to study on the long-term stability of rock engineering. The water existence in the rock has strongly affected the rock’s deformation and stability. The water has not only produced the hydrostatic pressure and seepage force but also has some affection on its mechanical property, which usually lowers the rock’s intensity index. According to the statistics, the damage of nearly 90% natural side slope and manmade slope has some connections with the underground water and 30%~40% dam accidents have some connections with the rock vadose.[1,2] The vadose field’s existence and change is one of the importance reasons that cause the imbalance of the rock project and that can even cause the large-scale geology disaster The crevice vadose pressure fasten the rock’s crack initiation extension penetration, macroscopically, this is also a process caused by the vadose, because the vadose can cause the rock strength’s weak or damage, on the other hand[3-8], the change of the rock’s stress and the extension of the rock’ damage can also lead to the change in its vadose features and it will change the distribution of the vadose field. [9-11]We should give a application of three-axis simulating experimental system for hydraulic fracturing study and carried out a large size hydraulic fracturing of rock crack propagation studies.[12]Therefore the experimental study on hydraulic fracturing in rock damage on rock engineering, slope project, tunnel project and other areas has broad application prospects.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Junzhe Li
AU  - Jun Zhang
AU  - Lixia Sun
PY  - 2015/11
DA  - 2015/11
TI  - Experimental study on hydraulic rock damage
BT  - Proceedings of the 5th International Conference on Civil Engineering and Transportation 2015
PB  - Atlantis Press
SP  - 1456
EP  - 1462
SN  - 2352-5401
UR  - https://doi.org/10.2991/iccet-15.2015.271
DO  - 10.2991/iccet-15.2015.271
ID  - Li2015/11
ER  -