固结快剪条件下细粒土抗剪强度指标影响因素分析研究

ANALYSIS IS SHEAR STRENGTH INDEX FACTORS OF FINE-GRAINED SOIL UNDER THE CONDITION OF CONSOOLIDATION AND FAST SHEAR

在实际工程中细粒土有着广泛的应用,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、塑性指数等3种主要因素对抗剪强度指标的影响。在固结快剪的条件下,利用正交设计的方法优化试验方案进行细粒土抗剪强度指标影响因素的研究。根据试验结果,分析了抗剪强度指标对各因素的敏感性;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,为细粒土抗剪强度指标的合理确定提供了一定的理论支持。

Fine grained soil has wide applications in actual engineering,and its shear strength indices affected by multiple factors.Because it is complex change,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 in this paper.Under the condition of consolidation and fast shear,influence factors of shear strength indicators of fine grained soil is studied utilizing the orthogonal design approach.According to testing result,sensitivity of shear strength indices about every factor 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.This study provides some theoretical support for determining exactly shear strength indices of fine grained soil.