粉煤灰改良花岗岩残积土试验研究
Experience study on granite residual soil improved by fly ash

以福州地区花岗岩残积砾质粘性土为试验研究土料，与粉煤灰进行不同比例的混合，形成以粉煤灰改良的花岗岩残积土，采用击实、直剪、渗透和湿化试验，研究粉煤灰改良花岗岩残积土的工程特性，得到养护时间和粉煤灰掺量的不同对花岗岩残积土抗剪强度、渗透性和水稳定性的影响规律. 研究表明，掺入粉煤灰可有效提高花岗岩残积土的抗剪强度，降低其渗透系数和崩解率，且龄期越长越明显.
The granite residual soil in Fuzhou was selected as the soil sample in order to gain its engineering characteristics by means of mixing it with different quantities of fly ash，which were studied via compaction tests，direct shear test，seepage test as well as wetting test，and the influent trends of the mixed quantities of fly ash and curing time on shear strength，permeability and water stability characteristics of granite residual soil were obtained. The results show that the fly ash content can effectively improve the shear strength of granite residual soil，reduce its permeability coefficient and disintegration rate，moreover，the trends become more pronounced as the mixed time goes on