赣南花岗岩残积土的抗剪强度及其影响因素
|
摘要
为研究赣南花岗岩残积土抗剪强度影响因素,采用X射线粉晶衍射和扫描电镜等方法对赣南地区的黑云母二长花岗岩残积土和黑云母花岗岩残积土的矿物成分及微观结构进行了分析,并通过三轴固结不排水剪切试验对2类花岗岩残积土的原状样与重塑样的抗剪强度进行了研究。结果表明:赣南花岗岩残积土矿物成分主要为石英矿物和高岭石、伊利石等黏土矿物,原生结构强度明显,原状样的抗剪强度高于重塑样;各围压下原状样和重塑样的应力-应变关系均呈应变-硬化型,表现为塑性破坏;受孔隙度大和粗颗粒多的影响,孔压-应变关系在低围压下表现为先剪缩后剪胀,在高围压下始终表现为剪缩;其内摩擦角受粗颗粒含量影响明显,黏聚力受细颗粒含量影响明显。
In order to study the influence factors of shear strength of granite residual soil in southern Jiangxi Province,X-ray powder diffraction and scanning electron microscopy were used to analysis the mineral composition and microstructure of biotite monzonitic granite residual soil and biotite granite residual soil in southern Jiangxi Province. Through triaxial consolidation undrained shear tests,the shear strength of undisturbed and remolded samples of two types of granite residual soils was also studied. The results show that the mineral compositions of granite residual soil in southern Jiangxi Province are mainly quartz minerals and clay minerals such as kaolinite and illite.The primary structural strength is obvious,and the shear strength of undisturbed sample is higher than that of remolded sample. The stress-strain relationship of undisturbed sample and remolded sample under various confining pressures is strain-hardening,which shows plastic failure; And the pore pressure-strain relationship is affected by large porosity and large coarse grains. Under low confining pressure,the relationship is first shear contraction and then shear dilatation,and always shear contraction under high confining pressure. The internal friction angle is obviously affected by the content of coarse particles,and the cohesion is obviously affected by the content of fine particles.
In order to study the influence factors of shear strength of granite residual soil in southern Jiangxi Province,X-ray powder diffraction and scanning electron microscopy were used to analysis the mineral composition and microstructure of biotite monzonitic granite residual soil and biotite granite residual soil in southern Jiangxi Province. Through triaxial consolidation undrained shear tests,the shear strength of undisturbed and remolded samples of two types of granite residual soils was also studied. The results show that the mineral compositions of granite residual soil in southern Jiangxi Province are mainly quartz minerals and clay minerals such as kaolinite and illite.The primary structural strength is obvious,and the shear strength of undisturbed sample is higher than that of remolded sample. The stress-strain relationship of undisturbed sample and remolded sample under various confining pressures is strain-hardening,which shows plastic failure; And the pore pressure-strain relationship is affected by large porosity and large coarse grains. Under low confining pressure,the relationship is first shear contraction and then shear dilatation,and always shear contraction under high confining pressure. The internal friction angle is obviously affected by the content of coarse particles,and the cohesion is obviously affected by the content of fine particles.
引文
1徐立红,费伦林,钱劲松.江西花岗岩残积土分布及路用性能研究[J].公路,2017(3):56-61Xu Lihong,Fei Lunlin,Qian Jinsong. Study on distribution and road performance of granite residual soil in Jiangxi Province[J]. High Way,2017(3):56-61
2 吴能森.结构性花岗岩残积土的特性及工程问题研究[D].南京:南京林业大学,2005Wu Nengsen. A study on characteristics and some engineering problems of granite residual soil with structural nature[D]. Nanjing:Nanjing Forestry University,2005
3 许旭堂,简文彬,柳侃.含水率和干密度对残积土抗剪强度参数的影响[J].地下空间与工程学报,2015,11(2):364-369Xu Xutang,Jian Wenbin,Liu Kan. The influence of water content and dry density on shear strength parameters of residual soil[J]. Chinese Journal of Underground Space and Engineering,2015,11(2):364-369
4 李凯,王志兵,韦昌富,等.饱和度对风化花岗岩边坡土体抗剪特性的影响[J].岩土力学,2016(增刊1):267-273Li Kai,Wang Zhibing,Wei Changfu,et al. Effect of saturation on shear strength characteristics of weathered granite slope soils[J].Rock and Soil Mechanics,2016(S1):267-273
5 龙志东,王中文,史斌,等.花岗岩残积土抗剪强度及其影响因素试验[J].长沙理工大学学报(自然科学版),2016,13(3):25-31Long Zhidong,Wang Zhongwen,Shi Bin,et al. Experimental research for shear strength and its influencing factors granite residual soil[J]. Journal of Changsha University of Science and Technology(Natural Science),2016,13(3):25-31
6 戴继,高广运,王铁宏.花岗岩残积土的地区差异及对其工程特性的研究[J].港工技术,2009,46(1):56-59Dai Ji,Gao Guangyun,Wang Tiehong. Regional differences of granitic residual soil and research on its engineering characteristics[J].Port Engineering Technology,2009,46(1):56-59
7 王清,唐大雄,张庆云,等.中国东部花岗岩残积土物质成分和结构特征的研究[J].长春地质学院学报,1991(1):73-81Wang Qing,Tang Daxiong,Zhang Qingyun,et al. A study on the structure and composition of granite residual soil in the eastern China[J]. Journal of Changchun University of Earth Science,1991(1):73-81
8 肖晶晶.花岗岩残积土的结构性及应力应变关系试验研究[D].广州:华南理工大学,2012Xiao Jingjing. Experimental study on structural property and stressstrain relationship of granite residual soil[D]. Guangzhou:South China University of Technology,2012
9 周小文,刘攀,胡黎明,等.结构性花岗岩残积土的剪切屈服特性试验研究[J].岩土力学,2015(增刊2):157-163Zhou Xiaowen,Liu Pan,Hu Liming,et al. An experimental study of shear yield characteristics of structured granite residual soil[J]. Rock and Soil Mechanics,2015(S2):157-163
10 王成华,李广信.土体应力-应变关系转型问题分析[J].岩土力学,2004,25(8):1185-1190Wang Chenghua,Li Guangxin. Analysis of problem of pattern transition in stress-strain relations of soils[J]. Rock and Soil Mechanics,2004,25(8):1185-1190
11 张先伟,李晶晶,李峻,等.雷州半岛玄武岩残积土的物质成分与结构特征[J].工程地质学报,2014,22(5):797-803Zhang Xianwei,Li Jingjing,Li Jun,et al. Structure and composition of residual soil from decomposed basalt at Leizhou Peninsula[J]. Journal of Engineering Geology,2014,22(5):797-803
12 褚福永,朱俊高,殷建华.基于大三轴试验的粗粒土剪胀性研究[J].岩土力学,2013(8):2249-2254Chu Fuyong,Zhu Jungao,Yin Jianhua. Study of dilatancy behaviors of coarse-grained soils in large-scale triaxial test[J]. Rock and Soil Mechanics,2013(8):2249-2254
2 吴能森.结构性花岗岩残积土的特性及工程问题研究[D].南京:南京林业大学,2005Wu Nengsen. A study on characteristics and some engineering problems of granite residual soil with structural nature[D]. Nanjing:Nanjing Forestry University,2005
3 许旭堂,简文彬,柳侃.含水率和干密度对残积土抗剪强度参数的影响[J].地下空间与工程学报,2015,11(2):364-369Xu Xutang,Jian Wenbin,Liu Kan. The influence of water content and dry density on shear strength parameters of residual soil[J]. Chinese Journal of Underground Space and Engineering,2015,11(2):364-369
4 李凯,王志兵,韦昌富,等.饱和度对风化花岗岩边坡土体抗剪特性的影响[J].岩土力学,2016(增刊1):267-273Li Kai,Wang Zhibing,Wei Changfu,et al. Effect of saturation on shear strength characteristics of weathered granite slope soils[J].Rock and Soil Mechanics,2016(S1):267-273
5 龙志东,王中文,史斌,等.花岗岩残积土抗剪强度及其影响因素试验[J].长沙理工大学学报(自然科学版),2016,13(3):25-31Long Zhidong,Wang Zhongwen,Shi Bin,et al. Experimental research for shear strength and its influencing factors granite residual soil[J]. Journal of Changsha University of Science and Technology(Natural Science),2016,13(3):25-31
6 戴继,高广运,王铁宏.花岗岩残积土的地区差异及对其工程特性的研究[J].港工技术,2009,46(1):56-59Dai Ji,Gao Guangyun,Wang Tiehong. Regional differences of granitic residual soil and research on its engineering characteristics[J].Port Engineering Technology,2009,46(1):56-59
7 王清,唐大雄,张庆云,等.中国东部花岗岩残积土物质成分和结构特征的研究[J].长春地质学院学报,1991(1):73-81Wang Qing,Tang Daxiong,Zhang Qingyun,et al. A study on the structure and composition of granite residual soil in the eastern China[J]. Journal of Changchun University of Earth Science,1991(1):73-81
8 肖晶晶.花岗岩残积土的结构性及应力应变关系试验研究[D].广州:华南理工大学,2012Xiao Jingjing. Experimental study on structural property and stressstrain relationship of granite residual soil[D]. Guangzhou:South China University of Technology,2012
9 周小文,刘攀,胡黎明,等.结构性花岗岩残积土的剪切屈服特性试验研究[J].岩土力学,2015(增刊2):157-163Zhou Xiaowen,Liu Pan,Hu Liming,et al. An experimental study of shear yield characteristics of structured granite residual soil[J]. Rock and Soil Mechanics,2015(S2):157-163
10 王成华,李广信.土体应力-应变关系转型问题分析[J].岩土力学,2004,25(8):1185-1190Wang Chenghua,Li Guangxin. Analysis of problem of pattern transition in stress-strain relations of soils[J]. Rock and Soil Mechanics,2004,25(8):1185-1190
11 张先伟,李晶晶,李峻,等.雷州半岛玄武岩残积土的物质成分与结构特征[J].工程地质学报,2014,22(5):797-803Zhang Xianwei,Li Jingjing,Li Jun,et al. Structure and composition of residual soil from decomposed basalt at Leizhou Peninsula[J]. Journal of Engineering Geology,2014,22(5):797-803
12 褚福永,朱俊高,殷建华.基于大三轴试验的粗粒土剪胀性研究[J].岩土力学,2013(8):2249-2254Chu Fuyong,Zhu Jungao,Yin Jianhua. Study of dilatancy behaviors of coarse-grained soils in large-scale triaxial test[J]. Rock and Soil Mechanics,2013(8):2249-2254