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摻土粉煤灰的工程性質(zhì)試驗研究

發(fā)布時間: 2012-09-15 11:04 查看: 2306次

粉煤灰混合物工程性質(zhì) 試驗研究
摘要：

粉煤灰是火電廠燃煤的副產(chǎn)品,如何處理利用是國內(nèi)外十分關(guān)注的問題.目前,解決這一問題的途徑很多,利用粉煤灰進行筑壩或作為基礎(chǔ)填筑材料是比較有效的消納方法.粉煤灰是一種輕質(zhì)、多孔松散體,在許多方面具有比較優(yōu)越的工程性能,但因為純的粉煤灰缺少必要的凝聚力,對水的反映較為敏感,從而對工程的安全運行造成不利影響.在粉煤灰中摻合不同量的黏土有望改善粉煤灰的工程性能,對不同摻土量粉煤灰力學(xué)特性的研究有助于更好促進粉煤灰的工程應(yīng)用.以咸陽渭河電廠粉煤灰為研究對象,對其摻入不同比例的黃土摻合形成摻土粉煤灰,通過擊實試驗、壓縮試驗、直剪試驗和三軸試驗等研究不同摻土量下粉煤灰的工程特性,得到不同摻土量對粉煤灰變形及強度特性的影響規(guī)律,為在工程中有效利用粉煤灰,改善其工程性質(zhì)提供參考.

Abstract：

Fly ash is a byproduct dumped out of thermal power plants which use coal as one kind of fuel. It is urgent to consider how the vast quantity of harmful fly ash resources can be utilized. There are a large number of potential solutions to this problem; an effective disposal method is to use it as a fill material for dam construction or filled ground. Fly ash is a uncompacted lightweight material with a lot of pores. On one hand, it has a superior engineering capability in many aspects; On the other hand, pure fly ash lacks any necessary cohesion so that it has a very sensitive reaction with water which is an undesirable effect on the safe operation of the project which employs pure fly ash. Based on above considered, the engineering performance of the fly ash can potentially be enhanced by mixing different quantities of clay into fly ash, therefore the study of mechanical properties of fly ash mixed with different quantities of clay could help to promote the engineering application of fly ash. The fly ash taking from the Xianyang Weihe Thermal Power Plant as the object of study, and different quantities of loess are used to obtain the mixed-soil fly ash, then the engineering characteristics of fly ash with different quantities of soil mixed are studied via compaction test, compression test, and direct shear test as well as triaxial compression test. Furthermore, the trends of influence of different quantities of soil mixed on deformation and strength characteristics of fly ash are also obtained. The research results will offer the basis for both the effective utilization of fly ash and the improvement of its engineering property.

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