基于潜在挤压比的地下工程软岩挤压程度评价方法研究

 软岩挤压变形是深埋或高应力软岩地下洞室建设中的难题，软岩挤压程度的科学评价对围岩变形稳定性控制至关重要，但现有应力和变形评价方法忽略了不同类型岩石变形能力的差异性。在明确挤压的基本概念及相应地质条件后，分析多种岩石的试验数据，结果表明岩石变形能力差异巨大，基于此提出潜在挤压比指标，可很好地描述这种差异性。总结并剖析现有评价方法的定义及评价标准，针对被广泛认可的Hoek方法忽略岩体个体差异造成评价结果出现明显偏差的问题，引入潜在挤压比指标进行修正，提出基于潜在挤压比的地下工程软岩挤压程度评价方法，很好地解决了此问题。

An evaluation method of squeezing degree based on potential squeezing ratio

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.