【摘要】：杭州地區(qū)海相沉積軟土具有天然含水量高,壓縮性高,承載力低,有機質(zhì)含量高等工程特性,在對其進行固化處理時,由于高有機質(zhì)含量的存在,水泥固化效果并不理想,因此有必要選擇適宜的添加劑來改善水泥固化的效果,從而配制一種高效復(fù)合固化劑,并且開發(fā)針對各種不同有機質(zhì)含量軟土的固化劑產(chǎn)品；為了將所開發(fā)的固化劑更好的應(yīng)用于工程實際,需要對固化土的強度形成規(guī)律和固化土滲透性等物理力學(xué)特性進行研究；另外,研究適宜固化土的本構(gòu)模型是對固化土進行數(shù)值模擬的基礎(chǔ)。為此,本文主要開展如下工作： (1)從軟土的成因分布,化學(xué),物理力學(xué)性質(zhì),應(yīng)力應(yīng)變關(guān)系,結(jié)構(gòu)性等方面對杭州地區(qū)第四紀(jì)全新統(tǒng)海相沉積軟土進行系統(tǒng)的研究,從而科學(xué)評價杭州軟土的工程特性。 (2)針對杭州地區(qū)海相軟土高有機質(zhì)含量和高含水量的特性,在添加水泥的基礎(chǔ)上,從選擇合適的礦物填料,減薄土壤雙電層的厚度,提高土壤PH值,增強早期強度,調(diào)節(jié)水泥離子和黏土顆粒的活性等五個方面選定生石膏,生石灰,碳酸鈉,FDN,水玻璃,三乙醇胺等六種添加劑來改善有機質(zhì)軟土的固化,開發(fā)性能優(yōu)越的高效復(fù)合固化劑。 (3)利用響應(yīng)面法來對添加劑進行優(yōu)選和配方研究,并考察各影響因子的交互作用規(guī)律。確定不同有機質(zhì)含量的最優(yōu)固化劑摻量和水泥摻量,使得所開發(fā)的固化劑產(chǎn)品能適應(yīng)于各種不同有機質(zhì)含量的軟土。 (4)采用水泥及固化劑GX08對有機質(zhì)土進行固化,分析各種因素對強度的影響規(guī)律,在此基礎(chǔ)上,建立同時考慮固化土中有機質(zhì)含量、水泥摻量、固化劑摻量和齡期影響的固化土綜合強度預(yù)測模型。 (5)分析固化土的重度和含水量等指標(biāo)受不同配比和齡期影響的變化規(guī)律。在對復(fù)合固化劑作用下固化土滲透性的變化規(guī)律進行研究的基礎(chǔ)上,建立復(fù)合固化土的滲透系數(shù)預(yù)測方法。 (6)考慮有機質(zhì)含量,固化劑摻量和水泥摻量三個因素影響下的損傷本構(gòu)模型參數(shù)的變化規(guī)律,以及損傷變量的演化規(guī)律,最終建立綜合考慮有機質(zhì)含量,固化劑摻量和水泥摻量影響的固化土彈塑性損傷模型。
[Abstract]:The marine sedimentary soft soil in Hangzhou area has the engineering characteristics of high water content, high compressibility, low bearing capacity and high organic matter content. When curing the soft soil, the solidification effect of cement is not ideal because of the existence of high organic matter content. Therefore, it is necessary to select suitable additives to improve the effect of cement curing, so as to prepare a kind of high efficiency compound curing agent, and to develop the hardener product for different organic matter content soft soil. In order to better apply the developed curing agent to the engineering practice, it is necessary to study the physical and mechanical properties of the solidified soil, such as the strength formation law and the permeability of the solidified soil. The study of constitutive model of suitable solidified soil is the basis of numerical simulation of solidified soil. For this reason, the main work of this paper is as follows: (1) A systematic study on the formation distribution, chemical, physical and mechanical properties, stress-strain relationship and structure of the Quaternary marine sedimentary soft soil of the Quaternary in Hangzhou area is carried out. Therefore, the engineering characteristics of Hangzhou soft soil are scientifically evaluated. (2) aiming at the characteristics of high organic matter content and high water content of marine soft soil in Hangzhou area, on the basis of adding cement, the suitable mineral filler is selected. Reducing the thickness of double electric layer of soil, increasing the PH value of soil, enhancing early strength, adjusting the activity of cement ion and clay particle, selecting raw gypsum, quicklime, sodium carbonate FDN, water glass, etc. Six kinds of additives, such as triethanolamine, are used to improve the solidification of organic soft soil and to develop high efficiency compound curing agent with superior performance. (3) the optimum selection and formulation of additives are studied by using response surface method. The interaction law of each influencing factor was investigated. The optimum amount of curing agent and cement content of different organic matter content are determined to make the product of curing agent suitable for soft soil with different organic matter content. (4) cement and GX08 are used to solidify organic soil. On the basis of analyzing the influence of various factors on strength, the organic matter content and cement content in solidified soil are considered simultaneously. The comprehensive strength prediction model of solidified soil affected by the content and age of curing agent. (5) the variation law of the degree and water content of solidified soil affected by different ratio and age were analyzed. On the basis of studying the changing law of permeability of solidified soil under the action of compound curing agent, the method of predicting permeability coefficient of composite solidified soil is established. (6) considering the content of organic matter, The variation of damage constitutive model parameters and the evolution of damage variables under the influence of three factors, the content of curing agent and the content of cement, are discussed. Finally, the organic matter content is considered synthetically. The elastoplastic damage model of solidified soil affected by the content of curing agent and cement.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU447

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