An evaluation method of squeezing degree based on potential squeezing ratio
ZHANG Chuanqing，ZHOU Hui，ZHU Yong，YANG Fanjie
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The squeezing deformation of soft rock is a problem in construction of the deep buried or high stress underground caverns in soft rock. The scientific evaluation of the squeezing degree is very important to the stability control of surrounding rock，but the existing methods of stress and deformation evaluation neglect the difference of rock deformability. After the basic concepts of the squeeze and its geological conditions were made clear，the test data of some types of rock was analyzed，which revealed the huge differences in the rock deformability. The potential squeezing ratio index based on the above understanding was put forward in the paper which was confirmed to be good to describe the individual differences. The definitions and criteria of the existing evaluation methods were summarized and analyzed. The obvious deviation of evaluation results based on the widely recognized Hoek?s method was due to the ignoring of rock?s individual differences. The Hoek?s method was thus modified based on the potential squeezing ratio and the evaluation method of squeezing degree based on the potential squeezing ratio was suggested.
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2016, Vol. 35 
