冻融循环对岸坡土体力学特性影响分析

Effect of freeze-thaw cycle on mechanical properties of bank slope soil

文中针对某河道工程岸坡土体开展冻融循环剪切破坏实验研究,分析了糯米浆、含水量、冻融循环次数对土体力学的影响。得出了掺糯米浆土体峰值荷载高于纯土体,其中以糯米浆含量5%试样峰值荷载为最大,但掺糯米浆土体趋于脆性破坏特性;含水量、冻融循环次数分别与剪切峰值荷载为负相关关系,高冻融循环次数及高含水量下,土体应变硬化显著;粘聚力参数与含水量、冻融循环次数均为负相关关系,糯米浆含量5%下抗剪特征参数均最大;含水量对内摩擦角影响较小。研究成果为水利工程中土体冻融循环剪切特性提供参考。

In this paper,the cyclic shear failure experiment of bank slope soil of a river project is carried out,and the effects of glutinous rice slurry,water content and the number of freezing-thawing cycles on soil mechanics were analyzed.The results show that the peak load of soil mixed with glutinous rice slurry is higher than that of pure soil,and the peak load of the sample containing 5%glutinous rice slurry is the largest,but the soil mixed with glutinous rice slurry tends to brittle failure characteristics.There is a negative correlation between water content and the number of freezing-thawing cycles and the peak shear load.The soil strain hardening is significant under high freezing-thawing cycles and high water content.The cohesion parameters were negatively correlated with water content and freeze-thaw cycles,and the maximum shear parameters were found when the content of glutinous rice pulp was 5%.Water content has little effect on internal friction Angle.The research results provide reference for the cyclic shear characteristics of freeze-thaw soils in hydraulic engineering.