河道淤泥气泡混合土制备方法及对工程性质影响试验研究

发布时间：2018-01-09 02:22

本文关键词：河道淤泥气泡混合土制备方法及对工程性质影响试验研究　出处：《苏州科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：在我国河网密布,为畅通河道,保障水利工程的正常运营,解决环境污染以保障河道的景观功能以及沿河居民良好的生活环境等问题,每年都要花费巨大的人力和财力对河道进行定期或不定期的清淤处理,利用淤泥含水量高以及流动性好的性质,将其进行轻质化处理,制备成满足实际工程要求的河道淤泥气泡混合土(FMLSS),实现了淤泥的资源化利用,具有重要的意义。河道淤泥气泡混合土(FMLSS)主要以河道淤泥为原料土,以水泥为固化剂,以不同的发泡剂制备的气泡为发泡材料,采用不同的发泡工艺制备而成,论文主要目的是考察发泡材料的发泡性能及适应性,从宏观和微观的角度对比分析了不同类型FMLSS的性能,并作出评价,为实际应用提供参考,以下为论文的主要研究内容:(1)通过气泡性能测试,综合发泡倍数和气泡半衰期,得出蛋白型、阴离子型发泡剂的适宜稀释浓度,并对阴离子型发泡剂进行复配优化,制备成综合性能较好的复配型发泡剂,通过对比分析得出,阴离子型发泡剂K12A浓度小,发泡倍数大,但稳泡性较低,蛋白型发泡剂稳泡性好,但理想浓度大且发泡倍数较小,成本较大,复配型发泡剂与蛋白型相比,理想浓度较蛋白型小,同时,稳泡性和发泡倍数都较大,与K12A相比,发泡倍数有一定的降低,但稳泡性能提高明显,综合性能较好。(2)为考察发泡材料的发泡性能及适应性,本次FMLSS的制备分别采用两种发泡工艺,分别为前发泡型和后发泡型,前发泡型FMLSS分为阴离子型(K型)、蛋白型(D型)、复配型(F型),所采用的气泡,分别由对应发泡剂,在适宜的稀释浓度下制备而成;后发泡型(H型)FMLSS选用双氧水为发泡剂。(3)为考察混合搅拌时间对不同类型FMLSS性能影响,确定合适的搅拌时间。试验发现,不同的混合搅拌时间下,FMLSS性能不同。适宜的混合搅拌时间有助于FMLSS整体性能的发挥,实际工程中应加以重视,且稳泡好的气泡制备的FMLSS其性能提升更明显。(4)对不同配比条件下的FMLSS性能进行对比分析。考察了水泥掺量、气泡掺量和原料土含水量三个因素,并重点对水泥掺量和气泡掺量进行研究。研究中发现,H型在整个配比条件下,轻质化效果差,且强度小,试样普遍脆性破坏;F型轻质化好的同时,其强度及变形均最优;K型轻质化较好,但其强度发挥不够理想;D型轻质化效果差的同时,其刚度普遍偏小。(5)发泡剂的适用性考察:双氧水制备FMLSS综合性能差,不满足工程应用;所选蛋白型发泡剂(D型)轻质化效果差且成本较高,应用价值低;复配型发泡剂(F型)和阴离子型发泡剂K12A轻质化效果好,制备低强度等级FMLSS两者性能差异小,但在制备高强度等级FMLSS或在低含水条件下,K12A适用性降低。整体显示,复配型发泡剂工程应用价值较高。(6)通过数字图像技术,得到了不同类型FMLSS微观构造参数,考察了微观构造与宏观特性的相关性。通过比较加载前后微观构造的变化,结合FMLSS加载后的破坏模式,总结了不同类型FMLSS的破坏机理。得出H型内部大微孔尺度过大,导致土体受载后迅速开裂,不利于强度变形的发挥。F型相比K型微孔分布均匀,且微孔尺度小,应力均匀分布于各个微孔孔壁之上,土骨架结构较稳定,表现出良好的强度变形特性。K型微孔分布不均匀,土体内含大微孔相对较多,加载后内部遭到破坏,性能降低,D型其破坏模式与低密度等级下F型相似,但其内部微孔分布的不均匀性及气泡泌水的现象,导致了FMLSS整体性能的降低。
[Abstract]:Clouds in our country for the flow of the river, river, to ensure normal operation of water conservancy project, in order to protect the residents along the river river landscape function and good living environment to solve the problems such as environmental pollution, dredging processing takes enormous human and financial resources on the channel regularly or irregularly every year, the use of sludge with high water content and flow properties well, the light treatment, prepared to meet the river silt bubble mixed soil engineering (FMLSS), realize the resource utilization of sludge, has important significance. The river silt bubble mixed soil (FMLSS) mainly in the river silt soil as raw materials, cement as curing agent. With different foaming agent to prepare bubble foaming material, the foaming process of different preparation and become, the objective of this paper is to study the adaptability of foaming performance and foam materials, comparison from the perspective of macro and micro The performance of different types of FMLSS are analyzed and evaluated to provide references for practical application, the main research content of this thesis is: (1) bubble through performance test, comprehensive foaming ratio and bubble half-life, that protein, the proper dilution anionic foaming agent concentration, and the anionic foaming agent was optimized prepared, good comprehensive performance of compound foaming agent, through the contrast analysis, anionic foaming agent K12A concentration, expansion ratio, but the stability of foam low protein foaming agent, foam stability is good, but the ideal concentration of large and small cost is larger, foam multiple, compound foaming agent compared with protein, protein concentration is the ideal type of small, at the same time, foam stability and foaming ratio are larger, compared with K12A, foaming ratio decreased to a certain extent, but the foam stability significantly improves the performance, overall performance is good. (2) for the study of foaming foaming material And adaptability, the FMLSS was prepared by using two kinds of foaming process, respectively, before and after foaming foaming, before foaming FMLSS divided into anionic (K type), protein type (type D), mixed type (F type), the bubble, respectively by the corresponding foaming agent, prepared in the dilution of the suitable concentration; after foaming type (H type) FMLSS using hydrogen peroxide as foaming agent. (3) to investigate the effect of mixing time on the performance of different FMLSS types, determine the appropriate mixing time. Experiments showed that the mixing time under different FMLSS performance is not suitable. The mixing time contributes to the overall performance of the FMLSS play, should be paid attention to in practical engineering, and good stability of foam bubbles of FMLSS prepared by its performance can be significantly improved. (4) comparison analysis on the performance of FMLSS under different proportion. The effects of cement content, gas bubble content and soil containing raw materials the three factors of water, And focus on the research of cement and bubble amount. The study found that H in the ratio under the condition of light, the effect is poor, and the strength of small samples, generally brittle failure; F type light good at the same time, the strength and deformation are optimal; type K light is good, but its strength play is not ideal; D type light effect at the same time, the stiffness is generally small. (5) applicability of foaming agent: hydrogen peroxide preparation of the comprehensive performance of FMLSS is poor, can not meet the engineering application; the selected protein foaming agent (D) light effect and high cost, low application value; compound foaming agent (F) and anionic foaming agent K12A light effect is good, the preparation of the difference property of low grade FMLSS, but in the preparation of high strength grade FMLSS or at low water conditions, the suitability of K12A decreased. The overall display, compound foaming agent engineering application value is high. (6) by digital Image technology, the different types of FMLSS micro structure parameters, investigates the correlation between microstructure and macroscopic properties. By changing the microstructure comparison before and after loading, combined with the failure modes of FMLSS after loading, summarizes the failure mechanism of different types of FMLSS. The H type internal micro scale is too large, resulting in soil after loading quickly cracking, strength and deformation is not conducive to play.F compared to the K type pore distribution is uniform, and the micro scale is small, the stress distribution on the pore wall, the soil skeleton structure is stable, exhibit good strength and deformation characteristics of.K type micro pore distribution is not uniform, the soil contains large pores relatively large, after the internal loading the destruction of reduced performance, D type failure mode with low density levels similar to type F, but the uneven distribution of internal pore and bubble bleeding phenomenon, resulting in reduced FMLSS overall performance.

【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU521.3

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