In order to analyze the relationship between ecological environment and engineering investment benefits,the excavated strongly weathered rock mixed with collapsible loess is improved by adding appropriate amount of cement,bentonite and pumping agent as fluid filling material.Based on a backfill project in Lanzhou,an orthogonal design was applied to test and investigate the unconfined compressive strength of fluid-solidified soil with different ratios of strongly weathered rock to obtain the best ratio of each factor.The influencing factors of compressive strength,its significance magnitude,and the water stability and freeze-thaw cycles under the microstructure of fluid-solidified soil of strongly weathered rock were analyzed.The results are as follows.The most significant factor affecting the compressive strength is cement,followed by loess.The influence of each factor on the compressive strength is in the following order:cement content,loess content,bentonite content,strong weathering rock coarse aggregate content,strong weathering rock fine aggregate content and pumping agent content.The compressive strength of the improved sample after water immersion gradually tends to level off with the growth of the maintenance age,indicating that its water stability performance has been improved.They are prone to Si content loss under freeze-thaw cycles,and the strength properties of the improved sample is related to Si element.
关键词
强风化岩/正交试验/流态固化土/抗压强度/水稳定性/微观分析/冻融循环
Key words
strongly weathered rock/orthogonal test/fluid-solidified soil/compressive strength/water stabili-ty/micro-analysis/freezing and thawing cycle
维普
万方数据