水利枢纽工程场地土料掺金属离子状态下三轴力学试验研究

Triaxial Mechanics Test Research on the Soil Material of Water Conservancy Project Site Mixed with Metal Ions

为分析粤北地区水利枢纽工程土体掺金属离子状态下三轴力学特征影响性,采用压缩渗透试验系统设计完成土体三轴力学试验,研究获得金属离子含量对土体力学特性影响具有阶段性变化,以离子含量20 g/L下加载应力为最大,在含量0~20 g/L区间内,土体强度递增,含量增大10 g/L,强度平均增长10.3%;含量20~60 g/L区间内,强度递减,含量增大20 g/L,土体强度平均损耗10.2%;金属离子含量愈大,则土体线弹性变形能力愈弱,进入塑性变形扩容阶段愈滞后。围压对土体力学特性影响主要限于应力特征,围压愈大,土体承载强度愈高,而变形特征受围压影响较小,各围压下原状土线弹性模量均为265.1 kPa。研究成果可为水利工程中地基土层承载力设计提供一定参考。

In order to analyze the influence of the triaxial mechanical characteristics of the soil in the water conservancy project in northern Guangdong under the condition of metal ions,the compression infiltration test system was used to complete the triaxial mechanical test of the soil,and the effect of the metal ion content on the mechanical properties of the soil was studied.Phase changes,the maximum loading stress is at the ion content of 20 g/L,the soil strength increases in the range of 0~20 g/L,the content increases by 10 g/L,the average strength increases by 10.3%,and the content is 20~60 g/L In the interval,the strength decreases,the content increases by 20 g/L,and the average loss of soil strength is 10.2%;the greater the metal ion content,the weaker the linear elastic deformation capacity of the soil,and the more lagging behind the plastic deformation expansion stage.The influence of confining pressure on the mechanical properties of soil is mainly limited to the stress characteristics.The greater the confining pressure,the higher the bearing strength of the soil,while the deformation characteristics are less affected by the confining pressure.The original soil linear elastic modulus under each confining pressure is 265.1 kPa.The research results can provide a certain reference for the design of the bearing capacity of foundation soil in water conservancy projects.