摘要
Abstract
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 30-50 μ m and<5 μ m,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/SEMKey words
Honghuajian Reservoir/soft clay/improved soil/dynamics/SEM分类
建筑与水利
