砂岩饱水软化效应试验研究
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摘要
巷道顶板围岩在长期富水条件下强度弱化,对巷道掘进与生产造成巨大威胁。为探究围岩在饱水条件下的力学性质,开展了三轴条件下砂岩饱水软化效应试验。研究表明:随着饱水时间的持续,砂岩应力-应变曲线变化不同;裂隙压密阶段持续过程逐渐延长,弹性变形阶段持续过程逐渐缩短;砂岩各项力学参数逐渐衰减,衰减幅度随饱水时间的增长而降低,饱水时间达到90d时,衰减幅度趋于平缓;砂岩饱水劣化效应明显,峰值应力、弹性模量、内摩擦角和黏聚力的劣化度累积具有相似的规律,饱水时间60d之前急剧累积,从60d到90d累积速率逐渐趋于平稳。
The strength of roof surrounding rock in roadway is weakened under the condition of long-term water enrichment,which poses a great threat to roadway excavation and production.To explore the mechanical properties of surrounding rock under the condition of saturation,experiments on sandstone water saturation softening effect under three axial conditions were carried out.The results show that with the duration of water saturation,the stress-strain curve of sandstone varies,the continuous process of crack compaction stage increases gradually,and the continuous process of elastic deformation stage decreases gradually.The various mechanical parameters of sandstone gradually decline,and the attenuation amplitude decreases with the increase of water saturation time.When the water saturation time reaches 90 days,the attenuation amplitude tends to be gentle.The saturated water deterioration effect of sandstone is obvious,and the deterioration degree of peak stress,elastic modulus,internal friction angle and cohesion accumulates with similar regularity.The time of water saturation accumulates rapidly before 60 days and the accumulation rate gradually becomes stable from 60 to 90 days.
The strength of roof surrounding rock in roadway is weakened under the condition of long-term water enrichment,which poses a great threat to roadway excavation and production.To explore the mechanical properties of surrounding rock under the condition of saturation,experiments on sandstone water saturation softening effect under three axial conditions were carried out.The results show that with the duration of water saturation,the stress-strain curve of sandstone varies,the continuous process of crack compaction stage increases gradually,and the continuous process of elastic deformation stage decreases gradually.The various mechanical parameters of sandstone gradually decline,and the attenuation amplitude decreases with the increase of water saturation time.When the water saturation time reaches 90 days,the attenuation amplitude tends to be gentle.The saturated water deterioration effect of sandstone is obvious,and the deterioration degree of peak stress,elastic modulus,internal friction angle and cohesion accumulates with similar regularity.The time of water saturation accumulates rapidly before 60 days and the accumulation rate gradually becomes stable from 60 to 90 days.
引文
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[3]姚强岭.富水巷道顶板强度弱化机理及其控制研究[D].徐州:中国矿业大学,2011.
[4]任松,文永江,姜德义,等.泥岩夹层软化试验研究[J],岩土力学,2013,(11):3 110-3 116.
[5]周翠英,邓毅梅,谭祥韶,等.饱水软岩力学性质软化的试验研究与应用[J].岩石力学与工程学报,2005,(1):33-38.
[6]藤宏伟,任松,姜德义,等.共和隧道页岩饱水软化试验研究[J].岩石力学与工程学报,2010,29(S1):2 657-2 662.
[7]宋勇军,雷胜友,毛正君,等.干燥和饱水状态下炭质板岩力学特性试验[J].煤炭科学技术,2014,42(10):48-52.
[8]夏冬,袁雪涛.浸水时间对饱水岩石抗剪强度参数影响的试验研究[J].矿业研究与开发,2015,35(12):65-69.
[9]张安斌,张艳博,刘祥鑫,等.水对泥质粉砂岩物理力学性能影响的试验研究[J].煤炭科学技术,2015,43(8):67-71.
[10]B V,P V.Influence of water content on the strength of rock[J].Engineering Geology,2005,84(1):70-74.
[11]傅晏,刘新荣,张永兴,等.水岩相互作用对砂岩单轴强度的影响研究[J].水文地质工程地质,2009,36(6):54-58.
[12]邓华锋,肖志勇,李建林,等.水岩作用下损伤砂岩强度劣化规律试验研究[J].岩石力学与工程学报,2015,34(S1):2 690-2 698.