基于正交实验的西北地区弱膨胀性围岩相似材料配比研究  

Research on the Ratio of Similar Materials of Weakly Expansive Surrounding Rocks in Northwest China based on Orthogonal Experiments

作　　者：周威扬 袁荣涛 杨景川 孔庆祥 康万鹏 吴红刚 ZHOU Weiyang;YUAN Rongtao;YANG Jingchuan;KONG Qingxiang;KANG Wanpeng;WU Honggang(College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730070,China;The Fourth Engineering Co.,Ltd.of China Railway First Group,Xianyang 712021,China;Northwest Research Institute Co.,Ltd.of CREC,Lanzhou 730000,China)

机构地区：[1]兰州大学土木工程与力学学院,兰州730070 [2]中铁一局集团第四工程有限公司,陕西咸阳712021 [3]中铁西北科学研究院有限公司,兰州730000

出　　处：《铁道勘察》2024年第2期64-70,78,共8页Railway Investigation and Surveying

基　　金：中铁一局集团第四工程有限公司科技开发项目重点课题(LZXM2021-001)。

摘　　要：为了得到更加精准的弱膨胀性泥岩相似材料配比方案,节省模型试验的材料和降低时间成本,提高试验效率和精度,基于正交理论,通过直剪试验和自由膨胀率试验,得到相似材料在不同配比情况下的黏聚力、内摩擦角及自由膨胀率。采用敏感度分析,得到各配比材料含量变化时对相似材料黏聚力、内摩擦角及自由膨胀率的影响程度,随后通过回归分析得到回归方程,最后将山湾隧道岩土体的自由膨胀率、内摩擦角、黏聚力代入回归方程,得到模型试验所需的材料配比方案,为西北地区弱膨胀性围岩模型试验提供相关依据。实验表明,重晶石粉、石灰、石膏、红黏土和膨润土等材料可以很好地模拟出膨胀岩的膨胀性。其中,重晶石粉与胶结物的比值变化对黏聚力影响最大,而黏土矿物与胶结物的比值变化对内摩擦角及自由膨胀率控制起主要作用。In order to obtain a more accurate proportioning scheme of similar materials for weak expansion mudstone,thereby reducing the material cost and time cost of model tests,and improving test efficiency and accuracy,based on the orthogonal theory,direct shear tests and free expansion rate tests were presenter in this paper to research the cohesion,internal friction angle and free expansion rate of similar materials in different proportions.Then sensitivity analysis was used to obtain the impact of changes in the material content of each ratio on the cohesion,internal friction angle and free expansion rate of similar materials.Then the regression equation was obtained through regression analysis.Finally,survey data of the Shanwan Tunnel,including free expansion rate,internal friction angle,and cohesion force,were substituted into the regression equation,and the material proportioning plan required for the model test was obtained which providing relevant basis for the model test of weakly expansionary surrounding rock in the northwest region.Experiments show that the materials,such as barite powder,lime,gypsum,red clay and bentonite,can well simulate the expansion properties of expansive rocks.Among them,the change in the ratio of barite powder to cement has the greatest impact on cohesion,while the change in the ratio of clay minerals to cement plays a major role in controlling the internal friction angle and free expansion rate.

关 键 词：高速铁路 铁路隧道 膨胀岩 敏感度分析 正交实验 回归方程 

分 类 号：U238[交通运输工程—道路与铁道工程] U25