合肥轨道交通沿线新老黏土特性比较分析
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摘要
合肥轨道交通1～5号线浅埋暗挖隧道穿越地层黏土主要是全新世黏土和晚更新世黏土,根据形成年代的早晚可以称之为新黏土和老黏土,两种黏土的工程特性存在差异,主要表现为老黏土具有膨胀性而新黏土不具有膨胀性,为了更深入地了解造成两种黏土特性差异的原因,依据合肥轨道交通沿线勘查资料,统计了两种黏土的物理力学参数,并对两种黏土的物理力学参数特征进行了比较分析,得到了两种黏土特性存在差异的初步结论;分别对两种黏土的物理力学参数进行了相关性分析;从微观角度揭示了新、老黏土结构的特点和差异,解释了两种黏土的微观结构对其工程性质的影响。得出结论:合肥地区新、老黏土在亲水性、压缩性和抗剪强度等物理指标上存在明显差异,以及新、老黏土微观结构不同,是造成两种黏土工程特性差异性的原因。
The clay of the strata along shallow-buried tunnels of Hefei Rail Transit Line 1-5 mainly consists of Holocene clay and Late Pleistocene clay, which can be called neo-clay and old clay respectively according to their formation age. The engineering characteristics of the two kinds of clay are different mainly in that the neoclay is expansive while the old clay is not. In order to better understand the causes for the differences between the two clays, the physical and mechanical parameters of these two kinds of clays were analyzed on the basis of data from the geological examination along Hefei Rail Transit Line 1-5, and preliminary conclusions of the differences between the two kinds of clay were made. Besides, the correlation between the physical and mechanical parameters of the two kinds of clay was explored. This paper also studied the characteristics of both clay and their existing variances through the lens of microscope, explained the influence of microstructure of the two kinds of clay on their engineering properties. It concluded that the obvious differences in physical indexes such as hydrophily, compressibility and shear strength between neo-clay and old clay in Hefei area, and the differences of their variant microstructures led to their different soil engineering characteristics.
The clay of the strata along shallow-buried tunnels of Hefei Rail Transit Line 1-5 mainly consists of Holocene clay and Late Pleistocene clay, which can be called neo-clay and old clay respectively according to their formation age. The engineering characteristics of the two kinds of clay are different mainly in that the neoclay is expansive while the old clay is not. In order to better understand the causes for the differences between the two clays, the physical and mechanical parameters of these two kinds of clays were analyzed on the basis of data from the geological examination along Hefei Rail Transit Line 1-5, and preliminary conclusions of the differences between the two kinds of clay were made. Besides, the correlation between the physical and mechanical parameters of the two kinds of clay was explored. This paper also studied the characteristics of both clay and their existing variances through the lens of microscope, explained the influence of microstructure of the two kinds of clay on their engineering properties. It concluded that the obvious differences in physical indexes such as hydrophily, compressibility and shear strength between neo-clay and old clay in Hefei area, and the differences of their variant microstructures led to their different soil engineering characteristics.
引文
[1]姚华彦.合肥膨胀土的膨胀特性试验研究[J].工业建筑,2015(S1):5.
[2]郭兆清,刘毅.合肥轨道交通1号线沿线的工程地质特性分析[J].工程与建设,2014,28(2):173-175.
[3]张万涛.合肥地区粘性土及白垩纪砂岩工程特性分析[J].山西建筑,2013,39(22):57-58.
[4]王康,孙熔正,杨新安.充填型浅层岩溶隧道溶洞处理技术研究[J].华东交通大学学报,2018,35(3):23-28.
[5]屈若枫,徐光黎,王金峰,等.武汉地区典型软土物理力学指标间的相关性研究[J].岩土工程学报,2014,36(S2):113-119.
[6]吴礼年,谢巧勤,方玉友.合肥地区粘性土物理力学指标的相关性分析[J].水文地质工程地质,2002(4):43-45.
[7]张先伟,孔令伟,郭爱国,等.湛江强结构性黏土的物理力学性质指标及相关性分析[J].工程地质学报,2011,19(4):447-454.
[8]于沉香,程江涛.细粒尾矿物理力学参数统计分析[J].路基工程,2015(4):95-100.
[9] DELAGE P.微观结构对用于工程屏障的高压实膨胀黏土性状的一些作用[J].岩石力学与工程学报,2006(4):721-732.
[10]周晖.珠江三角洲软土显微结构与渗流固结机理研究[D].广州:华南理工大学,2013.
[11]戴张俊,陈善雄,罗红明,等.南水北调中线膨胀土/岩微观特征及其性质研究[J].岩土工程学报,2013,35(5):948-954.
[12]祝卫东.温州软土与台州软土工程特性及其比较分析[D].杭州:浙江大学,2003.
[2]郭兆清,刘毅.合肥轨道交通1号线沿线的工程地质特性分析[J].工程与建设,2014,28(2):173-175.
[3]张万涛.合肥地区粘性土及白垩纪砂岩工程特性分析[J].山西建筑,2013,39(22):57-58.
[4]王康,孙熔正,杨新安.充填型浅层岩溶隧道溶洞处理技术研究[J].华东交通大学学报,2018,35(3):23-28.
[5]屈若枫,徐光黎,王金峰,等.武汉地区典型软土物理力学指标间的相关性研究[J].岩土工程学报,2014,36(S2):113-119.
[6]吴礼年,谢巧勤,方玉友.合肥地区粘性土物理力学指标的相关性分析[J].水文地质工程地质,2002(4):43-45.
[7]张先伟,孔令伟,郭爱国,等.湛江强结构性黏土的物理力学性质指标及相关性分析[J].工程地质学报,2011,19(4):447-454.
[8]于沉香,程江涛.细粒尾矿物理力学参数统计分析[J].路基工程,2015(4):95-100.
[9] DELAGE P.微观结构对用于工程屏障的高压实膨胀黏土性状的一些作用[J].岩石力学与工程学报,2006(4):721-732.
[10]周晖.珠江三角洲软土显微结构与渗流固结机理研究[D].广州:华南理工大学,2013.
[11]戴张俊,陈善雄,罗红明,等.南水北调中线膨胀土/岩微观特征及其性质研究[J].岩土工程学报,2013,35(5):948-954.
[12]祝卫东.温州软土与台州软土工程特性及其比较分析[D].杭州:浙江大学,2003.