| 张志镇*,高峰,高亚楠,徐小丽.高温后花岗岩应力脆性跌落系数的实验研究[J].实验力学,2010,25(5):589~597 |
| 高温后花岗岩应力脆性跌落系数的实验研究 |
| Experimental Study of Brittle Stress Drop Coefficient of Granite Endured High Temperature |
| 投稿时间：2010-02-08 修订日期：2010-04-13 |
| DOI： |
| 中文关键词: 岩石力学 花岗岩 温度 应力脆性跌落系数 岩爆倾向性 |
| 英文关键词:rock mechanics granite temperature coefficient of brittle stress drop rock burst trend |
| 基金项目:国家重点基础研究发展计划(973)项目(2010CB226804) |
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| 中文摘要: |
| 为研究温度对峰后区应力跌落的影响，通过高温后(常温~1200℃)花岗岩的单轴压缩试验，得到了不同温度后花岗岩全应力-应变曲线，并获得峰值应变、残余应变等特征参数随温度的变化规律。结果表明，高温后花岗岩变形特性较符合脆塑性体模型，峰值强度前呈显著线性关系，峰值屈服区段很狭窄，峰值后陡峻跌落至残余值，残余阶段稳定平缓；在800℃之前，可简化为理想弹性-应力脆性跌落-理想塑性三线型本构模型；800℃之后，峰前的屈服阶段逐渐明显，应力脆性跌落将不再发生，可简化为双线性弹性-线性软化-残余塑性四线型本构模型。给出了应力脆性跌落系数与温度的关系，温度越高，应力脆性跌落系数越大，且变化幅度越大。应力脆性跌落系数与岩爆倾向性指标随温度的变化趋势相反，故可用来作为评价岩爆倾向性的指标之一。 |
| 英文摘要: |
| In order to study the temperature effect on stress drop in post-failure region, complete granite stress-strain curve endured different high temperature and relations among several characteristic parameters such as peak strain, residual strain vs. temperature were obtained based on uniaxial compression test results of granite after endured high temperature (25℃~1 200℃). Results show that granite after endured high temperature can be described by brittle-plastic model, and the pre-failure part of stress-strain curve represents beeline, the yield part is confined, then drops rapidly to the residual value, and the residual part is smooth. For temperature below 800℃, the linear elastic-linear strain softening-residual plastic model is well adapted. For temperature above 800℃, the bilinear elastic-linear strain softening-residual plastic model is even better adapted. Brittle stress drop coefficient is a function of temperature. The coefficient proper and its variation range are bigger as temperature increases. The coefficient of brittle stress drop is correlative with the index of rock burst trend in an opposite way, so it can be used to evaluate the rock burst trend. |
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