碱渣改良风化泥岩的物理力学试验研究
|
摘要
为了改良泥岩的水稳定性并将风化泥岩用于路基填料,提出了用碱渣改性的方法。通过各种化学、物理及力学试验对改性前后泥岩的成分、膨胀性、力学特性、水理特性进行了对比分析,并初步分析了碱渣改性风化泥岩的微观机理。结果表明:碱渣改性后的泥岩自由膨胀率和50 kPa下膨胀变形率均有明显下降;碱渣改性后的泥岩土试样在满足95%压实度下的击实含水率与泥岩素土相比较宽,这为控制施工指标降低了难度;改性后泥岩抗压、抗剪强度均有显著增加,掺渣率为40%时达到顶峰;强度增加,是因为碱渣中的CaCO_3为改性后的泥岩土充当骨架,同时泥岩中的SiO_2与碱渣中提供的Ca(OH)_2发生反应,产生C-S-H胶凝材料;泥岩改性后试样接触角变大,由亲水性改为憎水性,提高了泥岩的拒水能力。
In order to improve the water stability of mudstone and apply weathered mudstone to subgrade filling,a method of modifying alkaline sludge was put forward.Through chemical,physical and mechanical tests,the composition,swelling property,mechanical properties and hydraulic properties of mudstone before and after modification were compared and analyzed,and the microcosmic mechanism of weathered mudstone modified by alkali residue was analyzed preliminarily.The results show that the deformation rate obviously decreased under 50 kPa.Expansion rate and expansion of the modified residue free mudstone;alkaline soil samples of modified mudstone after meet and mudstone compaction water content under 95% soil compaction compared to wide,this reduces the difficulty of construction control index;modified compression,mudstone the shear strength increased significantly,as the residue blending ratio reached a peak of 40%;the strength increases,because the CaCO_3 residue as mudstone soil skeleton changed after,while providing SiO_2 and residue in mudstone in the Ca(OH)_2 reaction to produce C-S-H cementitious materials;modified mudstone sample contact angle becomes larger,from hydrophilic to hydrophobic,improve water repellent ability of mudstone.
In order to improve the water stability of mudstone and apply weathered mudstone to subgrade filling,a method of modifying alkaline sludge was put forward.Through chemical,physical and mechanical tests,the composition,swelling property,mechanical properties and hydraulic properties of mudstone before and after modification were compared and analyzed,and the microcosmic mechanism of weathered mudstone modified by alkali residue was analyzed preliminarily.The results show that the deformation rate obviously decreased under 50 kPa.Expansion rate and expansion of the modified residue free mudstone;alkaline soil samples of modified mudstone after meet and mudstone compaction water content under 95% soil compaction compared to wide,this reduces the difficulty of construction control index;modified compression,mudstone the shear strength increased significantly,as the residue blending ratio reached a peak of 40%;the strength increases,because the CaCO_3 residue as mudstone soil skeleton changed after,while providing SiO_2 and residue in mudstone in the Ca(OH)_2 reaction to produce C-S-H cementitious materials;modified mudstone sample contact angle becomes larger,from hydrophilic to hydrophobic,improve water repellent ability of mudstone.
引文
[1]曾铃,史振宁,付宏渊,等.预崩解炭质泥岩路用性能及其基于三轴CT试验的力学特性[J].中南大学学报(自然科学版),2016,47(6):2030-2036.
[2]杨建林,王来贵,李喜林,等.露天矿泥岩路基双重改性研究[J].岩土工程学报,2015,37(8):1469-1477.
[3]马丽娜.高速铁路路基低黏土矿物泥岩膨胀机理及影响研究[D].兰州:兰州交通大学,2016.
[4]胡萍,王永和,卿启湘.软岩改良土特性的室内试验研究[J].湖南工业大学学报,2007(2):96-99.
[5]王建磊,王艳巧,杨广栋,等.干湿循环条件下水泥改性膨胀土变形和强度试验[J].郑州大学学报(工学版),2016,37(4):62-66.
[6]谭晔.膨胀土石灰、水泥改良抗剪强度特性试验研究[A].《工业建筑》2017年增刊III[C].2017:4.
[7]胡晓军,吴延枝.膨胀土改良技术研究综述[J].合肥学院学报(自然科学版),2014,24(4):80-85.
[8]孙树林,郑青海,唐俊,等.碱渣改良膨胀土室内试验研究[J].岩土力学,2012,33(6):1608-1612.
[9]郝静然,牛文涛.纯碱渣强度形成机理与综合环境评价方法研究[J].化工管理,2016(26):92.
[10]中华人民共和国交通部.JTJ051-93公路土工试验规程[S].北京:人民交通出版社,2000.
[11]中华人民共和国交通部.JTG D30-2004公路路基设计规程[S].北京:人民交通出版社,2004.
[12]刘毅.高庙子膨润土水化膨胀特性及其微观机理研究[J].工程地质学报,2016,24(3):451-458.
[2]杨建林,王来贵,李喜林,等.露天矿泥岩路基双重改性研究[J].岩土工程学报,2015,37(8):1469-1477.
[3]马丽娜.高速铁路路基低黏土矿物泥岩膨胀机理及影响研究[D].兰州:兰州交通大学,2016.
[4]胡萍,王永和,卿启湘.软岩改良土特性的室内试验研究[J].湖南工业大学学报,2007(2):96-99.
[5]王建磊,王艳巧,杨广栋,等.干湿循环条件下水泥改性膨胀土变形和强度试验[J].郑州大学学报(工学版),2016,37(4):62-66.
[6]谭晔.膨胀土石灰、水泥改良抗剪强度特性试验研究[A].《工业建筑》2017年增刊III[C].2017:4.
[7]胡晓军,吴延枝.膨胀土改良技术研究综述[J].合肥学院学报(自然科学版),2014,24(4):80-85.
[8]孙树林,郑青海,唐俊,等.碱渣改良膨胀土室内试验研究[J].岩土力学,2012,33(6):1608-1612.
[9]郝静然,牛文涛.纯碱渣强度形成机理与综合环境评价方法研究[J].化工管理,2016(26):92.
[10]中华人民共和国交通部.JTJ051-93公路土工试验规程[S].北京:人民交通出版社,2000.
[11]中华人民共和国交通部.JTG D30-2004公路路基设计规程[S].北京:人民交通出版社,2004.
[12]刘毅.高庙子膨润土水化膨胀特性及其微观机理研究[J].工程地质学报,2016,24(3):451-458.