固化石粉的力学性质试验分析-experimental analysis on mechanical properties of solidified stone powder.docxVIP

南昌航空大学硕士学位论文摘要南昌航空大学硕士学位论文摘要IIIIAbstractA large number of stone powder was produced inevitably during the production in stone factory, the treatment method tend to be less and costly, and improper handling can easily cause serious environment pollution. Currently, only a small number of stone powder are recycled, most are stacked or turned to be powder foundation. According engineering application situation of stabilized soil with different dosage cement, the paper puts forward two methods to deal with stone powder. One method is to be stabilized soil with a small amount of cement and lime to subgrade subbase, the another is to apply stabilized soil with a small amount of cement as a foundation. To achieve the purpose of turning waste into wealth and reducing engineering cost, the article concrete study the physical and mechanical properties of pure powder, solidified powder with low dosage of cement and solidified powder with high dosage of cement. Results showed that:（1）Stone powder is a kind of silt which is poor grading, index of low liquidlimit, high compressibility and acid. According to the standard ASTM in America it’s classified as SiltL. In form, powder particles is mainly angular and subangular, also have long strips, column and so on. The main mineral composition is quartz (SiO2), potash feldspar (KAlSi3O8) and a small amount of biotite.（2）Stone powder of low permeability, almost impermeable. The permeabilitycoefficient reduce an order of magnitude after adding cement and lime into powder, but it enhance the water stability，and Capillary water absorption coefficient weredifferent degrees of improvement. Powder is low compressibility soil after adding low dosage of cement and lime stabilized.（3） Consolidated undrained triaxial test (CU) indicates that the stabilitylimestone soil with the cement and lime mixture mixed tend to brittle failure. High content does not change significantly the peak stress under different confining pressure. The peak stra