掺土粉煤灰的工程性质试验研究

粉煤灰是火电厂燃煤的副产品，如何处理利用是国内外十分关注的问题。目前，解决这一问题的途径很多，利用粉煤灰进行筑坝或作为基础填筑材料是比较有效的消纳方法。粉煤灰是一种轻质、多孔松散体，在许多方面具有比较优越的工程性能，但因为纯的粉煤灰缺少必要的凝聚力，对水的反映较为敏感，从而对工程的安全运行造成不利影响。在粉煤灰中掺合不同量的黏土有望改善粉煤灰的工程性能，对不同掺土量粉煤灰力学特性的研究有助于更好促进粉煤灰的工程应用。以咸阳渭河电厂粉煤灰为研究对象，对其掺入不同比例的黄土掺合形成掺土粉煤灰，通过击实试验、压缩试验、直剪试验和三轴试验等研究不同掺土量下粉煤灰的工程特性，得到不同掺土量对粉煤灰变形及强度特性的影响规律，为在工程中有效利用粉煤灰，改善其工程性质提供参考。

Study of engineering property of mixed-soil fly ash

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.