含裂隙岩石注浆加固后的弯曲疲劳性能试验研究

doi:10.13722/j.cnki.jrme.2018.0155

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摘要利用纯环氧树脂(EP)和邻苯二甲酸二丁酯(DBP)增韧的环氧树脂浆液，对含裂隙大理岩和红砂岩进行加固，研究在三点弯高频疲劳荷载作用下注浆加固体的疲劳损伤规律。试验结果表明，注浆后岩石强度、韧性、抗疲劳性能均明显改善，且增韧EP注浆效果远强于纯EP。注浆加固后的应变及损伤量仍然符合三阶段变化规律：初始阶段，稳定阶段和加速阶段，根据疲劳寿命测试结果建立双对数疲劳寿命方程，拟合曲线与试验结果吻合较好，在相同的循环比情况下，增韧EP注浆后的损伤要小于纯EP注浆，应力水平是影响疲劳寿命的主要因素。

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	王志
	李龙

关键词 ：岩石力学, 三点弯, 疲劳, 损伤, 环氧树脂, 增韧

Abstract：Neat epoxy resin(EP) and Dibutyl phthalate(DBP) modified epoxy resin were proposed and applied to grout the cracked rock for reinforcement. The cumulative damages of the neat EP grouted samples and DBP modified EP grouted samples under high-frequency three-point fatigue load were compared. The test results showed that the strength，the deflection，and the fatigue performance of cracked rock were obviously increased after grouting. In addition，the grouting effect and the fatigue resistance of the samples with toughened EP were much stronger than that of neat EP. The strain and the damage of samples after grouting reinforcement also exhibited the three-phase behavior(initial damage phase，stability phase，and acceleration phase). The double logarithmic fatigue life equation was established，which has an excellent correlation with the experimental results. Moreover，the damage of toughened EP grouted specimens was less significant than the neat EP grouted samples at the same cycle ratio. Stress level is one of the most important factors affecting the fatigue life.

Key words： rock mechanics three point bending fatigue damage epoxy toughening

引用本文:

王志，李龙. 含裂隙岩石注浆加固后的弯曲疲劳性能试验研究[J]. 岩石力学与工程学报, 2018, 37(8): 1823-1832.
WANG Zhi，LI Long. Experimental study on bending fatigue behavior of grouting reinforced rock with fracture. , 2018, 37(8): 1823-1832.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0155 或 http://www.rockmech.org/CN/Y2018/V37/I8/1823

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