慢剪条件下细粒土抗剪强度指标影响因素分析研究  

STUDY ON INFLUENCE FACTORS OF SHEAR STRENGTH INDICES OF FINE GRAINED SOIL IN THE CONDICTION OF SLOW SHEAR TEST

作　　者：白建光[1] 周天平[1] 王亚玲[1] 王国忠[1] 于宝琪 

机构地区：[1]内蒙古农业大学能源与交通工程学院,呼和浩特010018 [2]内蒙古自治区高等级公路建设开发责任公司,呼和浩特010010

出　　处：《内蒙古农业大学学报（自然科学版）》2010年第3期193-195,共3页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：内蒙古农业大学博士基金(BJ07-67)

摘　　要：土的抗剪强度指标是工程设计中极其重要的计算参数,其准确与否直接关系到工程成败。工程性质较差的细粒土实际中广泛分布,其抗剪强度指标受多种因素影响,变化复杂,不易准确确定。本文在实际调查的基础上,考虑了孔隙比、含水率、塑性指数3个主要影响因素,利用正交设计的方法优化试验方案进行直剪试验研究细粒土抗剪强度指标影响因素。根据试验结果,计算了抗剪强度指标对各因素的敏感性系数,据此分析了抗剪强度指标对各因素的敏感程度,并利用多元回归的方法建立了粘聚力和内摩擦角与孔隙比、塑性指数、含水率等3个因素的回归方程,其相关系数分别为0.96和0.99,说明有很好的相关性。Shear strength indices of soil is a significant calculation parameters in engineering design,which influence the success and failure of engineering directly.Fine grained soil which is of poor engineering properties distributes largely and widely in practice,and its shear strength indices is affected by multiple factors.Because it varies complicatly,it is difficult to determinate precisely.On the basis of the actual investigation,void ratio,water content and plastic index are considered in this paper as mainly influence factors.Influence factors of shear strength indicators of fine grained soil is studied utilizing the orthogonal design approach and direct shear test.According to testing result,sensitivity coefficient of shear strength indices for every factor is calculated.And sensitivity degree of shear strength index is analyzed.Regression equation between cohesion and internal friction angle and void ratio,water content and plastic indicators are created by use of multiple regression method.Because their correlation coefficient are 0.96 and 0.99,it is showed that there are excellent correlative.

关 键 词：细粒土 抗剪强度指标 影响因素 敏感性分析 多元回归 

分 类 号：TU441.5[建筑科学—岩土工程]