發(fā)布時(shí)間：2018-08-21 12:28

【摘要】：本文在現(xiàn)行樁承式半剛性加筋墊層路堤及路基穩(wěn)定性計(jì)算理論與設(shè)計(jì)方法基礎(chǔ)上,通過理論研究、數(shù)值分析、工程實(shí)例計(jì)算比較,對樁承式半剛性加筋墊層路堤的墊層厚度、地基承載力、地基沉降和路基邊坡、路基擋土墻穩(wěn)定性的計(jì)算與設(shè)計(jì)方法進(jìn)行了較系統(tǒng)的分析與研究。主要工作和創(chuàng)新成果包括：1.建立了綜合考慮不同樁徑、不同樁間距、不同路基高度、不同筋材強(qiáng)度條件下的墊層厚度計(jì)算公式,可替代現(xiàn)行墊層厚度設(shè)計(jì)依靠經(jīng)驗(yàn)取值的設(shè)計(jì)方法,從而提高墊層厚度設(shè)計(jì)的科學(xué)性與經(jīng)濟(jì)性。2.在分析樁承式半剛性加筋墊層路堤的力學(xué)作用機(jī)理與地基承載力影響因素的基礎(chǔ)上,視樁承式半剛性加筋墊層路堤地基承載力等于樁體復(fù)合地基承載力、加筋墊層作用增加承載力、路基邊坡土體壓力作用增加承載力三者之和,采用疊加法原理得到了綜合考慮基礎(chǔ)剛度、樁體模量、樁間土體模量、樁徑、樁長、樁距、置換率、墊層厚度、加筋拉力等參數(shù)的樁承式半剛性加筋墊層路堤地基承載力的實(shí)用計(jì)算理論與設(shè)計(jì)方法。研究結(jié)果表明：樁承式半剛性加筋墊層路堤地基承載力隨基礎(chǔ)剛度的減小、置換率的提高、加筋層數(shù)的增加、墊層擴(kuò)散作用的加強(qiáng)而提高,筋材拉力對提高地基承載力起主要作用。3.推導(dǎo)了粘質(zhì)土路基穩(wěn)定性計(jì)算中求算相關(guān)角值的計(jì)算公式,并在此基礎(chǔ)上重新編制了精度較高現(xiàn)行角值表,提高了計(jì)算精度。找到了軟粘土路基某一邊坡坡度的各種可能破壞面的最小穩(wěn)定系數(shù)Kmin的解析公式,簡化了該類路基邊坡穩(wěn)定性分析與計(jì)算過程。4.引入計(jì)算粘聚力和計(jì)算內(nèi)摩擦角概念,建立了滲水性土路基穩(wěn)定性計(jì)算與設(shè)計(jì)的新方法——公式法。公式法反映了路基高度、路基邊坡坡度、路基穩(wěn)定系數(shù)、路基土體計(jì)算參數(shù)之間數(shù)值對應(yīng)關(guān)系,簡化了滲水性土路基邊坡穩(wěn)定性分析與計(jì)算過程。5.通過力學(xué)分析,研究了填石路基邊坡碼砌層的力學(xué)作用,分析了填石路基穩(wěn)定性影響因素,提出了填石路基穩(wěn)定性計(jì)算與設(shè)計(jì)方法,克服了此類路基現(xiàn)行計(jì)算與設(shè)計(jì)方法的粗糙性與不科學(xué)性。6.采用靜力平衡分析法,推導(dǎo)了擋土墻土壓力非線性分布條件下合力作用點(diǎn)高度、抗傾覆穩(wěn)定系數(shù)新定義計(jì)算公式,提出了抗傾覆穩(wěn)定性計(jì)算與設(shè)計(jì)新方法。該方法計(jì)算得到的抗傾覆穩(wěn)定系數(shù)小于現(xiàn)行規(guī)范法計(jì)算得到的抗傾覆穩(wěn)定系數(shù),采用不考慮土壓力非線性分布的現(xiàn)行規(guī)范法進(jìn)行擋土墻抗傾覆穩(wěn)定性設(shè)計(jì)存在安全隱患。7.在擋土墻抗傾覆穩(wěn)定系數(shù)新定義的基礎(chǔ)上,建立了考慮地基反力力矩的擋土墻抗傾覆穩(wěn)定性計(jì)算與設(shè)計(jì)新方法。擋土墻的抗傾覆穩(wěn)定系數(shù)與地基極限承載力有關(guān),地基極限承載力增大,擋土墻的抗傾覆穩(wěn)定系數(shù)增大。該方法計(jì)算得到的抗傾覆穩(wěn)定系數(shù)小于現(xiàn)行規(guī)范法計(jì)算得到的抗傾覆穩(wěn)定系數(shù),采用不考慮地基反力力矩的現(xiàn)行規(guī)范法進(jìn)行擋土墻抗傾覆穩(wěn)定性設(shè)計(jì)同樣存在安全隱患。本文提出的樁承式半剛性加筋墊層路堤及路基穩(wěn)定性的計(jì)算與設(shè)計(jì)方法是對已有相關(guān)技術(shù)的補(bǔ)充和完善。本文工作取得的計(jì)算與設(shè)計(jì)新方法可以用于指導(dǎo)實(shí)際工程的計(jì)算與設(shè)計(jì)。建議工程技術(shù)人員在工程實(shí)踐中采用本文的計(jì)算與設(shè)計(jì)方法進(jìn)行復(fù)核,并在必要時(shí)進(jìn)行調(diào)整。
[Abstract]:Based on the current theory and design method of stability calculation of semi-rigid reinforced pile-supported cushion embankment and subgrade, through theoretical research, numerical analysis and comparison of Engineering examples, this paper calculates the thickness of cushion, bearing capacity of foundation, settlement of foundation and slope of subgrade, stability of subgrade retaining wall and so on. The main work and innovations are as follows: 1. The formula for calculating the cushion thickness under different pile diameters, pile spacing, subgrade heights and reinforcement strengths is established, which can replace the design method of cushion thickness depending on experience to improve the cushion thickness. 2. On the basis of analyzing the mechanics mechanism of pile-supported semi-rigid reinforced cushion embankment and the influencing factors of foundation bearing capacity, it is considered that the bearing capacity of pile-supported semi-rigid reinforced cushion embankment is equal to the bearing capacity of pile composite foundation, the reinforced cushion increases the bearing capacity and the soil pressure of embankment slope. The pile-supported semi-rigid reinforced cushion embankment foundation bearing capacity calculation theory and design method are obtained by using the superposition principle, considering the parameters of foundation stiffness, pile modulus, soil modulus between piles, pile diameter, pile length, pile spacing, replacement rate, cushion thickness, reinforcement tension and so on. The bearing capacity of the foundation of the semi-rigid reinforced cushion embankment increases with the decrease of the foundation stiffness, the increase of the replacement rate, the increase of the number of reinforcement layers and the strengthening of the cushion diffusion. The tensile force of the reinforcement plays a major role in improving the bearing capacity of the foundation. 3. The formula for calculating the correlation angle in the calculation of the stability of the clayey soil subgrade is deduced, and on this basis, the weight is increased. A new angle table with higher accuracy is compiled to improve the calculation accuracy. The analytical formula of the minimum stability factor Kmin of various possible failure surfaces of a soft clay roadbed slope is found, which simplifies the stability analysis and calculation process of the roadbed slope. 4. The concepts of calculating cohesion and calculating internal friction angle are introduced, and the seepage soil is established. Formula method is a new method for subgrade stability calculation and design. Formula method reflects the numerical correspondence among subgrade height, subgrade slope gradient, subgrade stability coefficient and subgrade soil calculation parameters. It simplifies the analysis and calculation process of seepage soil subgrade slope stability. 5. Through mechanical analysis, the paper studies the rock fill subgrade slope code masonry layer. The mechanical action of the rock-filled embankment is analyzed. The calculation and design methods of the stability of the rock-filled embankment are put forward. The roughness and unscientificity of the current calculation and design methods of the rock-filled embankment are overcome. A new formula for calculating stability coefficient is defined and a new method for calculating and designing anti-overturning stability is proposed. Hidden danger. 7. Based on the new definition of the stability factor of retaining wall against overturning, a new method for calculating and designing the anti-overturning stability of retaining wall considering the reaction moment of foundation is established. The anti-overturning stability factor of retaining wall is related to the ultimate bearing capacity of foundation, the ultimate bearing capacity of foundation increases, and the anti-overturning stability factor of retaining wall increases. The stability factor of anti-overturning obtained by this method is less than that calculated by the current code method. There are also potential safety hazards in the design of anti-overturning stability of retaining wall by using the current code method without considering the reaction moment of foundation. The calculation and design method for the stability of semi-rigid reinforced cushion embankment and subgrade with pile-supported structure are presented in this paper. The new method of calculation and design obtained in this paper can be used to guide the calculation and design of practical engineering. It is suggested that engineers and technicians should review the calculation and design method in engineering practice and adjust it if necessary.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：U416.1

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