發(fā)布時(shí)間：2018-02-02 12:36

  本文關(guān)鍵詞： MBER土壤固化劑 NaCl 有限元分析　出處：《西北農(nóng)林科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：MBER固化土已經(jīng)在黃土高原得到了廣泛應(yīng)用,但是在海水咸水地區(qū)、鹽漬土地區(qū)的應(yīng)用研究還是空白。針對這一問題,本文通過試驗(yàn)、計(jì)算軟件研究分析了水質(zhì)對固化土性能的影響,得到以下研究結(jié)果:(1)水質(zhì)對固化土抗壓強(qiáng)度影響試驗(yàn)研究針對MBER固化劑在咸水地區(qū)應(yīng)用研究空白,采用不同濃度的氯化鈉溶液,對MBER固化土的無側(cè)限抗壓強(qiáng)度和彈性模量的規(guī)律性進(jìn)行了試驗(yàn)研究。根據(jù)試驗(yàn)結(jié)果,獲得了MBER固化土的7d與28d無側(cè)限抗壓強(qiáng)度的函數(shù)關(guān)系,水的含鹽度對固化土應(yīng)力應(yīng)變-關(guān)系的影響,彈性模量與抗壓強(qiáng)度的關(guān)系曲線,隨著氯化鈉濃度增加,當(dāng)氯化鈉濃度低于0.5%時(shí),無側(cè)限抗壓強(qiáng)度及彈性模量增加;氯化鈉濃度高于0.5%時(shí),無側(cè)限抗壓強(qiáng)度及彈性模量降低;彈性模量與無側(cè)限抗壓強(qiáng)度隨含鹽度變化的趨勢基本一致,兩者存在較好的線性相關(guān)性;適量濃度氯化鈉溶液對固化土早期強(qiáng)度提升顯著。研究得出,實(shí)際工程中水的氯化鈉濃度低于1%時(shí),可應(yīng)用于固化土工程建設(shè)。(2)水質(zhì)對固化土劈裂抗拉強(qiáng)度影響實(shí)驗(yàn)研究為研究水質(zhì)對劈裂抗拉強(qiáng)度的影響,采用不同濃度的氯化鈉溶液,對MBER固化土的劈裂抗拉強(qiáng)度的規(guī)律性進(jìn)行了試驗(yàn)研究。獲得了含鹽水質(zhì)影響條件下,固化土的劈裂抗拉強(qiáng)度隨水的氯化鈉濃度變化的關(guān)系以及劈裂抗拉強(qiáng)度與無側(cè)限抗壓強(qiáng)度的關(guān)系,根據(jù)試驗(yàn)結(jié)果,7d劈裂強(qiáng)度受氯化鈉濃度影響相對于28d明顯,其強(qiáng)度隨著氯化鈉濃度增加而減小,而28d劈裂強(qiáng)度受氯化鈉濃度影響不明顯�？偟膩砜�,固化土劈裂抗拉強(qiáng)度隨氯化鈉濃度的增加沒有明顯變化,基本維持水平。說明氯化鈉對固化土劈裂強(qiáng)度的影響隨著養(yǎng)護(hù)時(shí)間的增加而逐漸減小。(3)水質(zhì)對海泥性能影響試驗(yàn)研究為研究水質(zhì)對海泥性能影響,采用不同濃度的氯化鈉溶液,對MBER加固海泥的劈裂抗拉強(qiáng)度的規(guī)律性進(jìn)行了試驗(yàn)研究。試驗(yàn)結(jié)果表明,鹽分對海泥強(qiáng)度影響變化趨勢不明顯。(4)固化土道路結(jié)構(gòu)分析及水質(zhì)對其性能的影響通過對固化土道路結(jié)構(gòu)分析,發(fā)現(xiàn),在車輛荷載作用下最大拉應(yīng)力發(fā)生在固化土面層的底部,而最大壓應(yīng)力發(fā)生在固化土面層頂部輪胎作用處;路面應(yīng)力主要集中在車輛輪胎作用處附近,在模型中遠(yuǎn)離輪胎荷載的大部分位置的受的應(yīng)力較小,與輪胎荷載附近的應(yīng)力相差三個(gè)數(shù)量級(jí)。B、鹽漬土地區(qū)的固化土道路,以延安安塞地區(qū)為例,當(dāng)含鹽度低于閥值時(shí),可以適當(dāng)較小固化土路面厚度達(dá)到較好的經(jīng)濟(jì)效益;當(dāng)含鹽度高于閥值時(shí),此時(shí)修建的固化土道路應(yīng)在飲用水拌合固化土修建固化土道路的基礎(chǔ)上加大固化土面層的厚度,以保證工程安全可靠。(5)水窖有限元分析為研究水質(zhì)對固化土工程構(gòu)件的影響,利用有限元分析方法對固化土干性水窖在滿窖和空窖兩種不利工況下的應(yīng)力進(jìn)行了分析,得出空窖工況下固化土水窖受到的最大拉應(yīng)力與最大壓應(yīng)力大于滿窖工況下的應(yīng)力,即相對于滿窖工況空窖工況為不利工況。分析了水質(zhì)對固化土水窖性能的影響。當(dāng)水的含鹽度從0—4.5%變化時(shí),根據(jù)室內(nèi)實(shí)驗(yàn)數(shù)據(jù),利用ANSYS分析最不利條件即空窖條件下的水窖的受力和變形,發(fā)現(xiàn)隨著水質(zhì)含鹽度的增加,水窖所受的應(yīng)力沒有變化,應(yīng)變先減小后增加,在含鹽度為0.5%是,應(yīng)變最小,而水窖的應(yīng)力沒有變化。
[Abstract]:MBER solidified soil has been widely used in the Loess Plateau, but in the sea water area, saline land area application research is still blank. To solve this problem, through the test, calculation software research and analysis of the influence of water quality on the performance of solidified soil, the results are as follows: (1) the water quality of solidified soil compressive strength experimental study on MBER curing agent in the salt water area application blank, with different concentrations of MBER on Sodium Chloride Solution, the solidified soil showed no regularity of compressive strength and elastic modulus were studied. According to the test results, obtained the 7d and 28d of MBER solidified soil is not a function of unconfined compressive strength, water the salinity stress strain relationship of solidified soil, the relationship curves of elastic modulus and compressive strength, with the increase of the concentration of sodium chloride, when sodium chloride concentration is lower than 0.5%, the unconfined compressive strength The increase of elastic modulus; sodium chloride concentration is higher than 0.5%, no decrease of unconfined compressive strength and elastic modulus; elastic modulus and unconfined compressive strength with the salinity change tendency is consistent, there is a good linear correlation between the amount of solid concentration; Sodium Chloride Solution soil early strength were significantly improved. The sodium chloride the actual engineering water concentration is lower than 1%, which can be applied to the solidified soil engineering construction. (2) the water quality of solidified soil splitting tensile strength experimental study on the effect in order to study the effect of water quality on the splitting tensile strength, with different concentration of Sodium Chloride Solution, regularity of the splitting tensile strength of MBER stabilized soil tested study on salt water quality impact. The relationship between the changes of conditions, splitting tensile strength increases with the concentration of sodium chloride in water of solidified soil and the splitting tensile strength and the relationship between unconfined compressive strength and root According to the test results, 7d splitting strength is affected by the concentration of sodium chloride was compared with 28d, its strength decreases with the increase of NaCl concentration, while 28d splitting strength affected by the concentration of sodium chloride is not obvious. In general, splitting tensile strength of solidified soil increases with the concentration of sodium chloride did not change significantly, to maintain the basic level. Effect of sodium chloride on the splitting strength of the solidified soil with the increase of curing time decreased gradually. (3) the water quality of the mud performance experimental research on the effect in order to study the effect of water quality on the performance of mud, with different concentrations of Sodium Chloride Solution, the law of the splitting tensile strength of MBER reinforced mud was studied. The experimental results show that the change trend of effect of salinity on mud strength is not obvious. (4) impact analysis and water stabilized soil road structure on the performance of the solidified soil road structure analysis, found in the vehicle load Under the maximum tensile stress occurs in the solidified soil surface layer at the bottom, while the maximum compressive stress occurs in the soil surface layer at the top of the tire curing effect; pavement stress is mainly concentrated in the vicinity of vehicle tire, most position away from the tire load in the model of stress is smaller, and the tire load nearby the stress difference of three orders of magnitude.B, solidified soil road in saline soil area, taking Yanan Ansai area as an example, when the salinity is lower than a threshold, can be less stabilized soil pavement thickness to achieve better economic benefits; when the salinity is higher than the threshold value, the construction of the road should be solidified soil foundation construction of solidified soil in road drinking water mixing on the solidified soil solidified soil to increase the thickness of the surface, to ensure the safety and reliability of the project. (5) finite element analysis for the effect of water quality on soil solidification engineering components, of solidified soil by finite element method Dry cellar in full and empty cellar cellar of two kinds of stress under adverse conditions are analyzed, the maximum tensile solidified soil under the condition of empty cellar cellar by stress and maximum compressive stress is greater than the stress under the condition of full pit, which is relative to the full working condition of empty cellar pit water analysis of the impact of adverse conditions. Quality of solidified soil cellar performance. When the water salinity changes from 0 - 4.5%, according to the experimental data, using the ANSYS analysis of the most unfavorable conditions that empty cellar under the condition of water stress and deformation, it is found that with the increase of water salinity, water stress did not change, the first strain increased and then decreased, with a salinity of 0.5%, the minimum strain, and the water stress did not change.

【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU43

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