荷载-水化耦合下红层泥岩的变形特性
|
摘要
红层泥岩是一种常见的软岩,广泛分布于我国的西南、西北、华中及华南地区。水对红层泥岩的力学特性影响显著,由于降雨因素的影响,红层泥岩地区的边坡频频爆发崩塌、滑坡等工程事故。为模拟红层泥岩地区经历极端干燥天气后突降暴雨,即红层泥岩在不同荷载水平作用下从干燥状态到饱和状态水化作用的全过程,研究红层泥岩在不同荷载水平作用下遇水水化后的变形和强度特征,设计了一个简单试验装置和试验方案,实现了对红层泥岩在荷载-水化耦合作用下的变形特性研究。试验结果表明:①红层泥岩的水化作用明显,红层泥岩的饱和单轴抗压强度远低于干燥岩样的单轴抗压强度,考虑荷载作用下的干燥红层泥岩水化破坏应力水平又远低于泥岩的饱和强度;②破坏是一个渐变的过程,在某一应力水平作用下岩石的变形经历了一个从缓慢增长到急剧增长的过程,但岩样的破坏具有突然性,泥岩破坏后呈泥状。成果可为红层泥岩地区的工程稳定性研究提供一定的参考。
Red mudstone, a common soft rock, is widely distributed in southwest, northwest, central and southern China. As the mechanical properties of red mudstone degrades remarkably under the action of water, engineering accidents inclusive of collapses and landslides occur frequently in red mudstone area under the influence of rainfall. A simple test apparatus and test scheme was designed in the present research to investigate the deformation and strength features of red mudstone under the combined action of loading and hydration. The holistic process of red mudstone encountering sudden rainfall after extreme drought undergone dry state and saturation under different load levels were simulated. The conclusions are presented as follows:(1) the uniaxial compressive strength of water-saturated red mudstone was considerably lower than that of dry red mudstone, implying an evident hydration effect; while the stress level failure of dry red mudstone under the action of water lagged far behind the strength of saturated red mudstone.(2) Despite that the deformation of rock specimen experienced a progressive process from gentle development to dramatic surge under a certain stress level, the failure of specimen happened abruptly and instantly, and after failure, the specimen was in a muddy state.
Red mudstone, a common soft rock, is widely distributed in southwest, northwest, central and southern China. As the mechanical properties of red mudstone degrades remarkably under the action of water, engineering accidents inclusive of collapses and landslides occur frequently in red mudstone area under the influence of rainfall. A simple test apparatus and test scheme was designed in the present research to investigate the deformation and strength features of red mudstone under the combined action of loading and hydration. The holistic process of red mudstone encountering sudden rainfall after extreme drought undergone dry state and saturation under different load levels were simulated. The conclusions are presented as follows:(1) the uniaxial compressive strength of water-saturated red mudstone was considerably lower than that of dry red mudstone, implying an evident hydration effect; while the stress level failure of dry red mudstone under the action of water lagged far behind the strength of saturated red mudstone.(2) Despite that the deformation of rock specimen experienced a progressive process from gentle development to dramatic surge under a certain stress level, the failure of specimen happened abruptly and instantly, and after failure, the specimen was in a muddy state.
引文
[1] 徐瑞春,周建军.红层与大坝[M].武汉:中国地质大学出版社,2010.
[2] 彭华,吴志才.关于红层特点及分布规律的初步探讨[J].中山大学学报(自然科学版),2003,42(5):109-113.
[3] 程强,寇小兵,黄绍槟,等.中国红层的分布及地质环境特征[J].工程地质学报,2004,12(1):34-40.
[4] 李江,许强,王森,等.川东红层地区降雨入渗模式与岩质滑坡成因机制研究[J].岩石力学与工程学报,2016,35(增刊2):4053-4062.
[5] 张永安,李峰,陈军.红层泥岩水岩作用特征研究[J].工程地质学报,2008,16(1):22-26.
[6] 刘长武,陆士良.泥岩遇水崩解软化机制的研究[J].岩土力学,2000,21(3):28-31.
[7] 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,2005,24(1):33-38.
[8] 杨旭,周翠英,刘镇,等.华南典型巨厚层红层软岩边坡降雨失稳的模型试验研究[J].岩石力学与工程学报,2016,35(3):549-557.
[9] ERGULER Z A,ULUSAY R.Water-induced Variations in Mechanical Properties of Clay-bearing Rocks[J].International Journal of Rock Mechanics and Mining Sciences,2009,46(2):355-370.
[10] 王运生,吴俊峰,魏鹏,等.四川盆地红层水岩作用岩石弱化时效性研究[J].岩石力学与工程学报,2009,28(增刊1):3102-3108.
[11] 乔丽苹,刘建,冯夏庭.砂岩水物理化学损伤机制研究[J].岩石力学与工程学报,2007,26(10):2117-2124.
[12] 范祥,林杭,熊威,等.吸水率和吸水时间对红砂岩施密特硬度的影响[J].中国矿业大学学报,2015,44(2):233-240.
[13] 牛传星,秦哲,冯佰研,等.水岩作用下蚀变岩力学性质损伤规律[J].长江科学院院报,2016,33(8):75-79.
[14] 秦哲,付厚利,程卫民,等.水岩作用下露天坑边坡岩石蠕变试验分析[J].长江科学院院报,2017,34(3):85-89.
[15] TORRES-SUAREZ M C,ALARCON-GUZMAN A,DE MOYA R B.Effects of Loading-Unloading and Wetting-Drying Cycles on Geomechanical Behaviors of Mudrocks in the Colombian Andes[J].Journal of Rock Mechanics and Geotechnical Engineering,2014,6(3):257-268
[16] KIM E,CHANGANI H.Effect of Water Saturation and Loading Rate on the Mechanical Properties of Red and Buff Sandstones[J].International Journal of Rock Mechanics and Mining Sciences,2016,88:23-28
[17] 刘特洪,林天健.软岩工程设计理论与施工实践[M].北京:中国建筑工业出版社,2001:5.
[18] FRANCISS F O.Weak Rock Tunneling[M].Rotterdam,Netherlands:A.A.Balkema Press,1997:56-65.
[2] 彭华,吴志才.关于红层特点及分布规律的初步探讨[J].中山大学学报(自然科学版),2003,42(5):109-113.
[3] 程强,寇小兵,黄绍槟,等.中国红层的分布及地质环境特征[J].工程地质学报,2004,12(1):34-40.
[4] 李江,许强,王森,等.川东红层地区降雨入渗模式与岩质滑坡成因机制研究[J].岩石力学与工程学报,2016,35(增刊2):4053-4062.
[5] 张永安,李峰,陈军.红层泥岩水岩作用特征研究[J].工程地质学报,2008,16(1):22-26.
[6] 刘长武,陆士良.泥岩遇水崩解软化机制的研究[J].岩土力学,2000,21(3):28-31.
[7] 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,2005,24(1):33-38.
[8] 杨旭,周翠英,刘镇,等.华南典型巨厚层红层软岩边坡降雨失稳的模型试验研究[J].岩石力学与工程学报,2016,35(3):549-557.
[9] ERGULER Z A,ULUSAY R.Water-induced Variations in Mechanical Properties of Clay-bearing Rocks[J].International Journal of Rock Mechanics and Mining Sciences,2009,46(2):355-370.
[10] 王运生,吴俊峰,魏鹏,等.四川盆地红层水岩作用岩石弱化时效性研究[J].岩石力学与工程学报,2009,28(增刊1):3102-3108.
[11] 乔丽苹,刘建,冯夏庭.砂岩水物理化学损伤机制研究[J].岩石力学与工程学报,2007,26(10):2117-2124.
[12] 范祥,林杭,熊威,等.吸水率和吸水时间对红砂岩施密特硬度的影响[J].中国矿业大学学报,2015,44(2):233-240.
[13] 牛传星,秦哲,冯佰研,等.水岩作用下蚀变岩力学性质损伤规律[J].长江科学院院报,2016,33(8):75-79.
[14] 秦哲,付厚利,程卫民,等.水岩作用下露天坑边坡岩石蠕变试验分析[J].长江科学院院报,2017,34(3):85-89.
[15] TORRES-SUAREZ M C,ALARCON-GUZMAN A,DE MOYA R B.Effects of Loading-Unloading and Wetting-Drying Cycles on Geomechanical Behaviors of Mudrocks in the Colombian Andes[J].Journal of Rock Mechanics and Geotechnical Engineering,2014,6(3):257-268
[16] KIM E,CHANGANI H.Effect of Water Saturation and Loading Rate on the Mechanical Properties of Red and Buff Sandstones[J].International Journal of Rock Mechanics and Mining Sciences,2016,88:23-28
[17] 刘特洪,林天健.软岩工程设计理论与施工实践[M].北京:中国建筑工业出版社,2001:5.
[18] FRANCISS F O.Weak Rock Tunneling[M].Rotterdam,Netherlands:A.A.Balkema Press,1997:56-65.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |