發(fā)布時間：2018-06-07 10:13

  本文選題：疏浚淤泥 + 磷石膏�。� 參考：《昆明理工大學(xué)》2013年博士論文

【摘要】：固化疏浚淤泥-磷石膏混合土是以疏浚淤泥/磷石膏混合物為基質(zhì)土,通過添加水泥(石灰)將基質(zhì)土固化為填土材料的一項(xiàng)新技術(shù),以期實(shí)現(xiàn)疏浚淤泥、磷石膏兩種廢棄物的資源化利用。作為一項(xiàng)新型的廢棄物資源化處理技術(shù),需要對固化混合土的工程性質(zhì)進(jìn)行系統(tǒng)研究,以發(fā)展和完善混合料固化處理技術(shù)。 本文通過無側(cè)限抗壓強(qiáng)度試驗(yàn)、直剪試驗(yàn)、固結(jié)試驗(yàn)、滲透試驗(yàn)、線性膨脹率檢測等一系列室內(nèi)試驗(yàn),主要研究了基質(zhì)土中疏浚淤泥/磷石膏的合理混合比、疏浚淤泥初始含水率、養(yǎng)護(hù)齡期、不同固化劑及其摻量等不同因素對固化混合土工程性質(zhì)的影響；探討了固化土重塑土工程性質(zhì)、重塑時機(jī)、及其強(qiáng)度折減、恢復(fù)機(jī)理；初步揭示了膨脹性變化規(guī)律及其對固化混合土固化效果的影響,并對固化混合土的膨脹機(jī)理進(jìn)行了分析。 固化混合土工程性質(zhì)研究：(1)影響固化混合土的強(qiáng)度、壓縮特性、含水率以及滲透系數(shù)的主要因素有：基質(zhì)土中疏浚淤泥磷石膏混合比、疏浚淤泥初始含水率、養(yǎng)護(hù)齡期、固化劑及其摻量。在此基礎(chǔ)上提出了固化混合土強(qiáng)度變化與磷石膏摻量的關(guān)系模型,該模型把強(qiáng)度隨磷石膏摻量的變化分為三個階段：強(qiáng)度增長階段；強(qiáng)度降低階段；強(qiáng)度穩(wěn)定階段。(2)相比單一疏浚淤泥固化,固化混合土具有更好的固化效果,可以節(jié)省固化劑的摻量；其破壞應(yīng)變大于單一固化淤泥土,具有較好的韌性和工程適用性。(3)固化疏浚淤泥磷石膏混合土技術(shù)是可行的,可以實(shí)現(xiàn)同時大量消納疏浚淤泥、磷石膏兩種固體廢棄物,且固化成本不高。 固化土的重塑特性研究：(1)固化淤泥土、固化混合土的重塑土重塑時強(qiáng)度會發(fā)生顯著的折減,養(yǎng)護(hù)后強(qiáng)度會得到一定程度的恢復(fù)。重塑時機(jī)是影響強(qiáng)度折減、恢復(fù)的最重要因素,其它影響因素還有基質(zhì)土疏浚淤泥與磷石膏配比、固化劑及其摻量、重塑后養(yǎng)護(hù)齡期等。(2)從機(jī)理上看,重塑土強(qiáng)度折減主要由于破碎過程對粘聚力的破壞,強(qiáng)度恢復(fù)則來源于粘聚力和內(nèi)摩擦角的增長。固化淤泥重塑土的強(qiáng)度恢復(fù)是顆粒摩擦咬合力的增加、凝膠的修復(fù)兩者共同作用的結(jié)果,重塑時機(jī)是影響重塑后凝膠修復(fù)作用大小的重要因素；而固化混合土重塑土的強(qiáng)度恢復(fù)是顆粒摩擦咬合力的增加、凝膠的修復(fù)以及脹損三者協(xié)同作用的結(jié)果,重塑時機(jī)是影響三者協(xié)調(diào)性的重要因素。(3)相比原固化混合土,其重塑土具有更好的壓縮特性、更小的滲透系數(shù)。(4)重塑土具有較好的工程性質(zhì),采用固化土的重塑土作為土方填料是可行的,并分別探討了固化淤泥土以及固化混合土的最佳重塑時機(jī)。 固化混合土的膨脹特性研究：(1)固化混合土基本上都具有一定的膨脹性,整體來看膨脹性提高了固化混合土的密實(shí)度,對固化混合土是有益的。實(shí)驗(yàn)結(jié)果表明,線性膨脹率與疏浚淤泥初始含水率、固化劑摻量、疏浚淤泥與磷石膏的配比,養(yǎng)護(hù)時間等因素有關(guān),并給出了線性膨脹率隨各因素變化規(guī)律。(2)機(jī)理分析發(fā)現(xiàn),固化混合土水分轉(zhuǎn)化分為三步,水分轉(zhuǎn)化對固化混合土自生體積穩(wěn)定性,強(qiáng)度影響較大；固化混合土的宏觀體積是收縮和膨脹共同作用的結(jié)果,宏觀強(qiáng)度是膨脹損傷和凝膠修復(fù)共同作用的結(jié)果。(3)提出了對固化混合土膨脹性設(shè)定判斷標(biāo)準(zhǔn),根據(jù)前人標(biāo)準(zhǔn)判斷,固化混合土的膨脹程度基本上屬于微膨脹或中度膨脹,具有較好的工程適用性。
[Abstract]:The solidified dredged silt - phosphogypsum mixed soil is a new technology that uses the dredged silt / phosphogypsum mixture as the matrix soil and solidified the matrix soil into the filling material by adding cement (lime), in order to realize the dredging silt and the resource utilization of two kinds of phosphogypsum. The engineering properties of the mixed soil are systematically studied in order to develop and perfect the solidification treatment technology of the mixture.
In this paper, a series of laboratory tests, such as unconfined compression strength test, direct shear test, consolidation test, permeability test, linear expansion rate testing, are used to study the reasonable mixing ratio of dredged silt / phosphogypsum in matrix soil, the initial water content of dredged silt, curing age, and different factors such as curing agent and its content. The effect of process properties, the engineering properties of the remolded soil, the time of remolding, the strength reduction and the recovery mechanism are discussed, and the regularity of the expansibility and its effect on the curing effect of the cured mixed soil are preliminarily revealed, and the expansion mechanism of the cured mixed soil is analyzed.
Study on the engineering properties of solidified mixed soil: (1) the main factors affecting the strength, compression properties, moisture content and permeability coefficient of the solidified mixed soil include the mixing ratio of dredged silt and phosphogypsum, the initial water content of dredged silt, curing age, curing agent and its content. On this basis, the strength changes of the solidified soil and the phosphorus stone are put forward. The relationship model of paste content is divided into three stages: the strength increase stage, the strength decrease stage, the strength decrease stage, the strength stable stage. (2) the solidified soil has better curing effect compared with the single dredged silt, and it can save the dosage of the solidifying agent; the damage strain is greater than the single solidifying silt. Soil has good toughness and engineering applicability. (3) it is feasible to solidify dredged silt phosphogypsum mixed soil technology, and can achieve a large amount of dredging silt, two kinds of phosphogypsum solid waste at the same time, and the curing cost is not high.
Study on the remolding characteristics of solidified soil: (1) solidify silt soil, the strength of the remolded soil of the solidified soil will be significantly reduced and the strength will be restored to a certain extent after curing. The time of remolding is the most important factor affecting the strength reduction and recovery, and the other factors are the ratio of matrix soil dredged silt and phosphogypsum, and the curing agent. And its content, remolded curing age, etc. (2) from the mechanism, the strength reduction of remolded soil is mainly due to the destruction of the cohesive force in the crushing process, and the strength recovery comes from the increase of cohesion and internal friction angle. The strength recovery of the remolded soil of the solidified mud is the increase of the particle friction bite force, and the result of the joint action of the gel repair is heavy. The plastic time is an important factor affecting the remolding effect of the remolded gel, and the strength recovery of the remolded soil of the solidified soil is the increase of the particle friction and bite force, the repair of the gel and the synergistic effect of the three parts of the swelling, and the time of remolding is an important factor affecting the coordination of the three. (3) compared with the original solidified soil, the remolded soil has a remolded soil. Better compression characteristics and smaller permeability coefficient. (4) the remolded soil has better engineering properties, and the remolded soil of the solidified soil is practicable as a earthwork filler, and the best time to remould the solidified silt and solidified soil is discussed respectively.
Study on the swelling characteristics of solidified mixed soil: (1) the solidified mixed soil has a certain expansibility basically. In the whole, the expansibility improves the density of the solidified soil and is beneficial to the solidified mixed soil. The experimental results show that the linear expansion rate and the initial water content of dredged silt, the dosage of the curing agent, the ratio of the dredged silt to the phosphogypsum, The linear expansion rate varies with each factor. (2) the mechanism analysis shows that the water conversion of the solidified mixed soil is divided into three steps. The water transformation has a great influence on the stability of the spontaneous volume of the solidified soil and the strength of the soil; the macroscopic volume of the solidified mixed soil is the result of the joint action of shrinkage and expansion and the macroscopic strength. It is the result of the joint effect of expansion damage and gel repair. (3) a criterion for determining the expansibility of the solidified mixed soil is put forward. According to the previous standards, the expansion degree of the solidified mixed soil is basically of micro expansion or medium expansion, which has good engineering applicability.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU449

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本文編號：1990811