本文關(guān)鍵詞：河道淤泥氣泡混合土制備方法及對(duì)工程性質(zhì)影響試驗(yàn)研究　出處：《蘇州科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 河道淤泥氣泡混合土 發(fā)泡劑 物理力學(xué)性質(zhì) 微觀構(gòu)造 破壞機(jī)理

【摘要】：在我國(guó)河網(wǎng)密布,為暢通河道,保障水利工程的正常運(yùn)營(yíng),解決環(huán)境污染以保障河道的景觀功能以及沿河居民良好的生活環(huán)境等問題,每年都要花費(fèi)巨大的人力和財(cái)力對(duì)河道進(jìn)行定期或不定期的清淤處理,利用淤泥含水量高以及流動(dòng)性好的性質(zhì),將其進(jìn)行輕質(zhì)化處理,制備成滿足實(shí)際工程要求的河道淤泥氣泡混合土(FMLSS),實(shí)現(xiàn)了淤泥的資源化利用,具有重要的意義。河道淤泥氣泡混合土(FMLSS)主要以河道淤泥為原料土,以水泥為固化劑,以不同的發(fā)泡劑制備的氣泡為發(fā)泡材料,采用不同的發(fā)泡工藝制備而成,論文主要目的是考察發(fā)泡材料的發(fā)泡性能及適應(yīng)性,從宏觀和微觀的角度對(duì)比分析了不同類型FMLSS的性能,并作出評(píng)價(jià),為實(shí)際應(yīng)用提供參考,以下為論文的主要研究?jī)?nèi)容:(1)通過氣泡性能測(cè)試,綜合發(fā)泡倍數(shù)和氣泡半衰期,得出蛋白型、陰離子型發(fā)泡劑的適宜稀釋濃度,并對(duì)陰離子型發(fā)泡劑進(jìn)行復(fù)配優(yōu)化,制備成綜合性能較好的復(fù)配型發(fā)泡劑,通過對(duì)比分析得出,陰離子型發(fā)泡劑K12A濃度小,發(fā)泡倍數(shù)大,但穩(wěn)泡性較低,蛋白型發(fā)泡劑穩(wěn)泡性好,但理想濃度大且發(fā)泡倍數(shù)較小,成本較大,復(fù)配型發(fā)泡劑與蛋白型相比,理想濃度較蛋白型小,同時(shí),穩(wěn)泡性和發(fā)泡倍數(shù)都較大,與K12A相比,發(fā)泡倍數(shù)有一定的降低,但穩(wěn)泡性能提高明顯,綜合性能較好。(2)為考察發(fā)泡材料的發(fā)泡性能及適應(yīng)性,本次FMLSS的制備分別采用兩種發(fā)泡工藝,分別為前發(fā)泡型和后發(fā)泡型,前發(fā)泡型FMLSS分為陰離子型(K型)、蛋白型(D型)、復(fù)配型(F型),所采用的氣泡,分別由對(duì)應(yīng)發(fā)泡劑,在適宜的稀釋濃度下制備而成;后發(fā)泡型(H型)FMLSS選用雙氧水為發(fā)泡劑。(3)為考察混合攪拌時(shí)間對(duì)不同類型FMLSS性能影響,確定合適的攪拌時(shí)間。試驗(yàn)發(fā)現(xiàn),不同的混合攪拌時(shí)間下,FMLSS性能不同。適宜的混合攪拌時(shí)間有助于FMLSS整體性能的發(fā)揮,實(shí)際工程中應(yīng)加以重視,且穩(wěn)泡好的氣泡制備的FMLSS其性能提升更明顯。(4)對(duì)不同配比條件下的FMLSS性能進(jìn)行對(duì)比分析�？疾炝怂鄵搅�、氣泡摻量和原料土含水量三個(gè)因素,并重點(diǎn)對(duì)水泥摻量和氣泡摻量進(jìn)行研究。研究中發(fā)現(xiàn),H型在整個(gè)配比條件下,輕質(zhì)化效果差,且強(qiáng)度小,試樣普遍脆性破壞;F型輕質(zhì)化好的同時(shí),其強(qiáng)度及變形均最優(yōu);K型輕質(zhì)化較好,但其強(qiáng)度發(fā)揮不夠理想;D型輕質(zhì)化效果差的同時(shí),其剛度普遍偏小。(5)發(fā)泡劑的適用性考察:雙氧水制備FMLSS綜合性能差,不滿足工程應(yīng)用;所選蛋白型發(fā)泡劑(D型)輕質(zhì)化效果差且成本較高,應(yīng)用價(jià)值低;復(fù)配型發(fā)泡劑(F型)和陰離子型發(fā)泡劑K12A輕質(zhì)化效果好,制備低強(qiáng)度等級(jí)FMLSS兩者性能差異小,但在制備高強(qiáng)度等級(jí)FMLSS或在低含水條件下,K12A適用性降低。整體顯示,復(fù)配型發(fā)泡劑工程應(yīng)用價(jià)值較高。(6)通過數(shù)字圖像技術(shù),得到了不同類型FMLSS微觀構(gòu)造參數(shù),考察了微觀構(gòu)造與宏觀特性的相關(guān)性。通過比較加載前后微觀構(gòu)造的變化,結(jié)合FMLSS加載后的破壞模式,總結(jié)了不同類型FMLSS的破壞機(jī)理。得出H型內(nèi)部大微孔尺度過大,導(dǎo)致土體受載后迅速開裂,不利于強(qiáng)度變形的發(fā)揮。F型相比K型微孔分布均勻,且微孔尺度小,應(yīng)力均勻分布于各個(gè)微孔孔壁之上,土骨架結(jié)構(gòu)較穩(wěn)定,表現(xiàn)出良好的強(qiáng)度變形特性。K型微孔分布不均勻,土體內(nèi)含大微孔相對(duì)較多,加載后內(nèi)部遭到破壞,性能降低,D型其破壞模式與低密度等級(jí)下F型相似,但其內(nèi)部微孔分布的不均勻性及氣泡泌水的現(xiàn)象,導(dǎo)致了FMLSS整體性能的降低。
[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.

【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU521.3

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