红花涧水库坝址区软黏土改良设计下宏、细观力学特征研究  

Study on the Macro and Micro Mechanical Characteristics of Soft Clay under the Improved Design in Honghuajian Reservoir Dam Site Area

作　　者：付世平 FU Shiping(Zhaoyuan Jindu Water Conservancy Survey and Design Co.,Ltd.,Zhaoyuan 265400,China)

机构地区：[1]山东省招远市金都水利勘测设计有限公司,山东招远265400

出　　处：《广东水利水电》2025年第3期90-95,共6页Guangdong Water Resources and Hydropower

摘　　要：为研究红花涧水库坝址区内软黏土的改良效果,设计了宏观力学试验与SEM细观扫描测试,基于宏、细观力学试验结果,对改良土的承载力学变化进行了对比分析。研究表明,围压对试样应变破坏特征影响作用高于改性剂掺量因素。改性剂掺量与试样承载能力呈正相关,但增长效应逐步减弱。在不同的温度区间内,试样应变特征会具有截然不同的发展态势。随温度愈低,低温劣化效应愈显著。改良土内部颗粒骨架紧密性较高,颗粒间为边-边接触方式,颗粒皱褶弯曲形态较少。在围压50 kPa和300 kPa下,试样内部孔隙数量最多的分别为直径30~50μm、<5μm,掺量不会改变试样应变破坏发展路径。研究成果可对水利工程中软黏土的改良设计以及宏、细观力学特征分析提供参考。In order to study the improvement effect of soft clay in the dam site area of Honghuajian Reservoir,macroscopic mechanical tests and SEM microscopic scanning tests were designed.Based on the results of macroscopic and microscopic mechanical tests,the changes in bearing mechanics of the improved soil were compared and analyzed.Research has shown that the influence of confining pressure on the strain failure characteristics of specimens is higher than that of modifier dosage factors.The dosage of modifier is positively correlated with the load-bearing capacity of the sample,but the growth effect gradually weakens.In different temperature ranges,the strain characteristics of the sample have completely different development trends.The lower the temperature,the more significant the low-temperature degradation effect.The compactness of the particle skeleton inside the improved soil is relatively high,and the particles are in edge to edge contact,with fewer wrinkles and bending shapes.At confining pressures of 50kPa and 300kPa,the maximum number of internal pores in the sample are those with diameters of 30-50μm and<5μm,the dosage did not change the strain failure development path of the sample.The paper can provide reference for the improvement design of soft clay in hydraulic engineering and the analysis of macro and micro mechanical characteristics.

关 键 词：红花涧水库 软黏土 改良土 力学 SEM 

分 类 号：TU411[建筑科学—岩土工程]