冻融作用下全风化千枚岩力学性质研究
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摘要
选取山区全风化千枚岩滑带土为研究对象,实验条件下对其进行全矿物X射线衍射分析测试以及经历不同次数冻融循环作用后全风化千枚岩滑带土的抗剪强度、单轴抗压强度的测试,对全风化千枚岩滑带土在水-低温作用下抗剪强度和单轴抗压强度等相关指标的变化进行了研究,揭示了全风化千枚岩滑带土在水-低温作用下相关指标的劣化规律,并初步探讨其劣化机理.结果表明,在多次冻融作用下,云母、方解石、长石、黄铁矿等矿物的溶蚀,石膏与伊利石、伊蒙混层等次生黏土矿物的生成及其吸水膨胀与失水收缩,使滑带土孔隙增大,是全风化千枚岩滑带土在冻融条件下物理、力学性能的主要原因;冻融前期黄铁矿在湿润条件下极易氧化并产生强酸,加速溶蚀并腐蚀其他矿物,致使全风化滑带土冻融前期力学性能劣化速率远大于后期.
The fully weathered phylite rock-slip belt soil in the mountainous area was selected as the research object. Experimental conditions were provided for a mineral X-ray diffraction analysis and different number of freeze-thaw cycle effects after fully weathered phyllite were experienced; the shear strength of sliding zone, uniaxial compressive strength test, the weathered phyllite sliding zone soil under the action of water and low temperature shear strength, uniaxial compressive strength and the correlative indexes of change were all studied, the degradation law of related indexes of the fully weathered rock slip zone soil under water-low temperature action was explored and its degradation mechanism preliminarily discussed. The results showed that, under the effect of repeated freeze-thaw, calcite, feldspar, mica, thedissolution of minerals such as pyrite, gypsum and secondary clay minerals such as illite, deceiving layer content generation and its water absorption expansion and water loss contraction, would increase pore sliding zone, which was fully weathered phyllite sliding zone soil under the condition of freezing and thawing of the main causes of physical and mechanical properties. Pyrite was easy to oxidize and produced strong acid under wet conditions in the early freezing-thawing period, which accelerated the dissolution and corrosion of other minerals, thus resulting in a much higher mechanical property degradation rate of soil in the early freezing-thawing period in the fully weathered slip belt than that in the later period.
The fully weathered phylite rock-slip belt soil in the mountainous area was selected as the research object. Experimental conditions were provided for a mineral X-ray diffraction analysis and different number of freeze-thaw cycle effects after fully weathered phyllite were experienced; the shear strength of sliding zone, uniaxial compressive strength test, the weathered phyllite sliding zone soil under the action of water and low temperature shear strength, uniaxial compressive strength and the correlative indexes of change were all studied, the degradation law of related indexes of the fully weathered rock slip zone soil under water-low temperature action was explored and its degradation mechanism preliminarily discussed. The results showed that, under the effect of repeated freeze-thaw, calcite, feldspar, mica, thedissolution of minerals such as pyrite, gypsum and secondary clay minerals such as illite, deceiving layer content generation and its water absorption expansion and water loss contraction, would increase pore sliding zone, which was fully weathered phyllite sliding zone soil under the condition of freezing and thawing of the main causes of physical and mechanical properties. Pyrite was easy to oxidize and produced strong acid under wet conditions in the early freezing-thawing period, which accelerated the dissolution and corrosion of other minerals, thus resulting in a much higher mechanical property degradation rate of soil in the early freezing-thawing period in the fully weathered slip belt than that in the later period.
引文
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[12]蒋秀姿,文宝萍.缓慢复活型滑坡滑带土的蠕变性质与特征强度试验研究[J].岩土力学, 2015, 36(2):495-501, 549.
[13]汤文,姚志宾,李邵军,等.水化学作用对滑坡滑带土的物理力学特性影响试验研究[J].岩土力学, 2016,37(10):2885-2892.
[14] Ismail M A, Joer H A, Randolph M F, et al. Cementation of porous materials using calcite[J]. Geotechnique,2002, 52(5):313-324.
[15]黄宏伟,车平.泥岩遇水软化微观机理研究[J].同济大学学报:自然科学版, 2007, 52(7):866-870.
[16]徐则民,黄润秋,唐正光,等.黏土矿物与斜坡失稳[J].岩石力学与工程学报, 2005, 24(5):729-740.
[17]崔凯,吴国鹏,王秀丽,等.泥石流沟道斜坡板岩气候环境响应行为与机制研究[J].岩石力学与工程学报,2016, 35(增刊1):2944-2952.
[18]崔凯,吴国鹏,王秀丽,等.不同水岩作用下板岩物理力学性质劣化实验研究[J].工程地质学报, 2015, 23(6):1045-1052.
[2]钟秀梅,刘伟,谌文武,等.黄土-全风化泥岩接触带诱发黄土滑坡敏感性分析[J].兰州大学学报:自然科学版, 2019, 55(1):73-78.
[3]庞茂康.白龙江流域滑坡发育特征及其成因的地质环境条件研究[D].成都:成都理工大学, 2011.
[4]王娟. G212线陇南段滑坡滑带土工程特性试验研究[D].兰州:兰州大学, 2006.
[5]黎志恒,文宝萍,贾贵义,等.甘肃省白龙江流域滑坡分布规律及其主控因素[J].兰州大学学报:自然科学版,2015, 51(6):768-776.
[6] Asaoka A, Sawada Y, Yamada S. Riedel shear band formation with flower structures that develop at the surface ground on a strike slip fault[J]. Japanese Geotechnical Society Special Publication, 2016, 2(20):751-754.
[7] Crosetto M, Copons R, Cuevas-González M, et al. Monitoring soil creep landsliding in an urban area using persistent scatterer interferometry(El Papiol, Catalonia,Spain)[J]. Landslides, 2018, 15(7):1317-1329.
[8] Maio C D, Scaringi G, Vassallo R. Residual strength and creep behaviour on the slip surface of specimens of a landslide in marine origin clay shales:influence of pore fluid composition[J]. Landslides, 2015, 12(4):657-667.
[9] Houssais M, Ortiz C P, Durian D J, et al. Onset of sediment transport is a continuous transition driven by fluid shear and granular creep[J]. Nature Communications,2015, 6:6527.
[10] Tiwari B, Marui H. Objective oriented multistage ring shear test for shear strength of landslide soil[J]. Journal of Geotechnical and Geoenvironmental Engineering,2004, 130(2):217-222.
[11] Bhat D R, Bhandary N, Yatabe R. Residual-state creep behavior of typical clayey soils[J]. Natural Hazards,2013, 69(3):1-18.
[12]蒋秀姿,文宝萍.缓慢复活型滑坡滑带土的蠕变性质与特征强度试验研究[J].岩土力学, 2015, 36(2):495-501, 549.
[13]汤文,姚志宾,李邵军,等.水化学作用对滑坡滑带土的物理力学特性影响试验研究[J].岩土力学, 2016,37(10):2885-2892.
[14] Ismail M A, Joer H A, Randolph M F, et al. Cementation of porous materials using calcite[J]. Geotechnique,2002, 52(5):313-324.
[15]黄宏伟,车平.泥岩遇水软化微观机理研究[J].同济大学学报:自然科学版, 2007, 52(7):866-870.
[16]徐则民,黄润秋,唐正光,等.黏土矿物与斜坡失稳[J].岩石力学与工程学报, 2005, 24(5):729-740.
[17]崔凯,吴国鹏,王秀丽,等.泥石流沟道斜坡板岩气候环境响应行为与机制研究[J].岩石力学与工程学报,2016, 35(增刊1):2944-2952.
[18]崔凯,吴国鹏,王秀丽,等.不同水岩作用下板岩物理力学性质劣化实验研究[J].工程地质学报, 2015, 23(6):1045-1052.