【作者】 侯晋芳；

【导师】 闫澍旺；

【作者基本信息】 天津大学 ， 岩土工程， 2004， 硕士

【摘要】 碱渣是纯碱生产过程中产生的废料,大量堆存形成“碱渣山”。“碱渣山”占用大量土地阻碍了地区的开发和建设,而且碱渣干燥状态极易扬尘严重地影响周围的环境,因此治理碱渣刻不容缓。近年来将碱渣作为工程土用于填垫等实际工程,产生了巨大的经济和社会效益。以往对堆积年代较久的碱渣进行了较深入的研究,有了一定的认识,而对新堆积的碱渣的研究工作尚未开展,由于碱厂改进工艺使得新堆积的碱渣颗粒更细,含水量更高,所以本文就主要针对如何降低新堆积的天津碱厂“三号汪子”碱渣的含水量进行了研究,同时也研究将其运用于实际的填垫工程。为了更好地认识碱渣,作者结合以前的研究成果,先从碱渣的微观结构和强度的形成机理进行研究,了解碱渣原始颗粒结晶特征,搞清楚碱渣颗粒与水的相互作用机制,揭示碱渣强度的形成机理,并且将碱渣与粉煤灰拌和后形成的碱渣土的微观结构与碱渣微结构进行比较,搞清碱渣颗粒与拌和材料颗粒相互作用的机制。然后通过室内的物理力学试验,从宏观上进一步认识碱渣的物理力学性质。随后针对碱渣的高含水量不易于运输的缺点,提出利用加硫酸和轻型井点降水法降低碱渣的含水量,并作了室内和现场的试验,结果证实利用轻型井点法能有效地降低碱渣的含水量。最后将碱渣拌合粉煤灰制成的工程土运用于填垫工程,采用两种思路达到承载力要求,一种是天然晾晒碾压,通过做室内和现场晾晒试验,证明是可行的;另一种是真空预压,通过室内和现场追踪试验,证实能满足地基承载力要求,达到了加固地基的目的。更多还原

【Abstract】 Soda residue is the waste residue from the soda producing, largely piling up ofthe soda residue becomes the ‘Soda Residue Hill’. The ‘Soda Residue Hill’ ties up alot of land and hinders the development and construction of the region, thereby thesoda residue disposal is no time delay. Recent years, the soda residue has been reusedin engineering, which has achieved large economy and effect upon society. Theresearch of the old soda residue is relatively deep, but the new soda residue doesn’tbegin to be studied. The characters of new soda residue have been changed for newtechnology as soda being produced, having smaller grain and higher water content.Therefore, this thesis mainly analyzes how to decrease the water content of the sodaresidue storage yard No. 3 in Tianjin soda factory, and studies how to reuse the sodaresidue in geotechnical engineering.To kNow the soda residue better, the following research works on the base of theprecious research have been made.Firstly, through the analysis about the microstructure and strength mechanism ofthe soda residue, the crystallization of the grain of soda residue and the interactionmechanism between the grain of soda residue and the hole water are kNown clearly,and then the mechanism that how to form the strength is also disclosed. Comparingthe microstructure of soda residue with one of the mixture of the soda residue and thefly ash, it is clear to kNow the interaction mechanism with the grain of soda residueand one of the mixture. Secondly, the thesis expounds the physical and mechanicalcharacters of the soda residue after lots of in door experiments. Thirdly, it is difficultto transport the soda residue with high water content. To solve the problem, the thesisadopts adding sulphuric acid to the soda residue and light well-point dewatering.Through lots of experiments, it is proved that the later is feasible. Finally, there aretwo ways to attain the demand of the carrying capacity when the mixture of sodaresidue and fly ash is practiced in engineering. One is air-dried under the naturalcondition and then rolling over the soda residue, the other is vacuum preloading. Thetwo ways that consolidated the soda residue all can satisfy with the demand of thecarrying capacity.更多还原