场地填土料污染状态下剪切力学特性分析研究

Research on shear mechanics characteristics under the contaminated state of filling material

为分析吕梁水利枢纽工程场地填土料受污染物状态下剪切力学特性,设计开展填土料剪切力学试验。研究法向应力具有正向促进填土料剪切应力水平作用,填土料剪切应力发展为“线性增长-平稳变化”两阶段,法向应力可促进线性阶段模量增大。污染物含量对填土料剪切应力影响具有阶段性,以含量30 g/L为节点,在该节点前、后区间内分别为递增、递减特征。法向应力与填土料抗剪强度具有线性正相关函数关系,且法向应力增大,可提升污染物含量递增区间内强度增长效应,降低污染物含量递减区间内的强度抑制效应。试验成果可为水利工程中污染状态下土体剪切力学特征认知提供一定参考。

In order to analyze the shear mechanics characteristics of the fill material in the contaminated state of the Lvliang Water Conservancy Project site,the shear mechanics test of the fill material was designed and carried out.The test results indicate that the normal stress can positively promote the level of the shear stress of the fill material.The shear stress of the fill material develops into two stages of“linear growth-steady change”,and the normal stress can promote the increase of the modulus in the linear phase.The influence of pollutant content on the shear stress of the fill material has a phased effect.Taken the content of 30 g/L as the node,the shear stress of fill material at the interval before and after this node is increased and decreased respectively.The normal stress has a linear positive correlation with the shear strength of the fill material,and the increase of the normal stress can increase the strength growth effect in the increasing interval of pollutant content and reduce the strength restraining effect in the decreasing interval of pollutant content.The above results can provide a certain reference for the recognition of soil shear mechanics characteristics under contaminated conditions in water conservancy projects.