本文選題：邊坡加固 + 水泥土樁��； 參考：《廣西大學(xué)》2016年博士論文

【摘要】：在航道開發(fā)建設(shè)的同時(shí),不可避免產(chǎn)生大量的人工開挖高邊坡,邊坡土質(zhì)多存在淤泥質(zhì)粘土,粘土,填土等軟弱及不穩(wěn)定巖土層,邊坡穩(wěn)定性不足,必須對(duì)邊坡進(jìn)行治理。因邊坡高度大,坡線長,范圍廣,采用傳統(tǒng)的鋼筋混凝土抗滑樁方案存在建設(shè)工期長,工程造價(jià)高等問題。目前,通過深層攪拌法或高壓噴射注漿法形成水泥土樁來加固軟土地基在工程建設(shè)中得到了廣泛的應(yīng)用。但水泥土樁用于基坑、邊坡和路堤等工程加固時(shí),穩(wěn)定性分析尚無統(tǒng)一的規(guī)范遵循,水泥土樁加固邊坡的變形破壞特性、抗滑機(jī)理、合理布樁結(jié)構(gòu)形式以及設(shè)計(jì)計(jì)算理論等都缺少相關(guān)研究資料,理論研究滯后于工程實(shí)踐�；诖�,本文在國內(nèi)外相關(guān)研究的基礎(chǔ)上,通過室內(nèi)試驗(yàn)、模型試驗(yàn)、數(shù)值模擬、理論分析等方法,對(duì)水泥土樁加固邊坡的抗滑特性、工作機(jī)理以及設(shè)計(jì)計(jì)算理論等進(jìn)行了系統(tǒng)研究,主要的研究工作與結(jié)論如下：(1)完成了178個(gè)試樣的室內(nèi)試驗(yàn),內(nèi)容包括單軸抗壓、徑向劈裂和三軸壓縮,分析了水泥土的強(qiáng)度特性和變形破壞特性。根據(jù)水泥土剪脹過程所受到的影響因素,建立了水泥土剪脹角模型方程。同時(shí)根據(jù)論文研究目的,選取了適合描述水泥土材料力學(xué)性質(zhì)的本構(gòu)模型和強(qiáng)度準(zhǔn)則。(2)詳細(xì)介紹極限平衡法和有限元強(qiáng)度折減法應(yīng)用于邊坡穩(wěn)定性分析的原理、方法及其各自的適用性。分析了D-P強(qiáng)度準(zhǔn)則與M-C強(qiáng)度準(zhǔn)則的等效性,并對(duì)相關(guān)參數(shù)進(jìn)行探討,結(jié)果表明D-P準(zhǔn)則參數(shù)a有效范圍為0≤a≤(?)/6。對(duì)D-P系列準(zhǔn)則的在邊坡穩(wěn)定計(jì)算上的精度進(jìn)行了分析,擴(kuò)展了強(qiáng)度折減法所采用的屈服準(zhǔn)則范圍。(3)運(yùn)用Abaqus結(jié)合強(qiáng)度折減技術(shù)對(duì)水泥土樁加固邊坡的變形破壞特性和抗滑機(jī)理進(jìn)行數(shù)值模擬分析。結(jié)果表明：采用離散水泥土樁加固邊坡,當(dāng)邊坡失穩(wěn)時(shí),剛度和強(qiáng)度都較大的水泥土樁呈S型撓曲變形而發(fā)生彎折破壞。傳統(tǒng)極限平衡法假設(shè)樁體只發(fā)生剪切破壞,計(jì)算結(jié)果將會(huì)高估加固邊坡的穩(wěn)定性。提出了水泥土剪力墻的概念,通過數(shù)值模擬發(fā)現(xiàn),采用水泥土剪力墻加固邊坡,因墻土界面摩擦力的作用,下滑力在剪力墻和滑體間得到調(diào)整,最終促使加固邊坡產(chǎn)生整體剪切破壞,從而有效發(fā)揮剪力墻的抗滑能力。(4)以20：1的幾何相似常數(shù)建立水泥土樁復(fù)合地基水平剪切模型試驗(yàn),試驗(yàn)結(jié)果顯示離散水泥土樁和水泥土剪力墻的變形破壞特性、抗滑機(jī)理與數(shù)值模擬的結(jié)果相似,模型試驗(yàn)得出的規(guī)律證明了數(shù)值模擬結(jié)果的合理性。(5)基于數(shù)值模擬和模型試驗(yàn)研究,提出了幾個(gè)離散水泥土樁加固邊坡的整體穩(wěn)定性分析簡化計(jì)算方法,通過對(duì)8個(gè)算例的分析證明等效抗剪強(qiáng)度法精度較高,宜在設(shè)計(jì)中優(yōu)先采用。進(jìn)一步地,將支持向量機(jī)(SVM)、粒子群算法(PSO)和強(qiáng)度折減法(SRM)相結(jié)合,建立了水泥土剪力墻加固邊坡的SRM-SVM-PSO設(shè)計(jì)優(yōu)化技術(shù),利用Matlab編制了相關(guān)程序,算例分析表明,通過優(yōu)化剪力墻的設(shè)計(jì)變量,加固邊坡的安全性和經(jīng)濟(jì)性都得到了滿足。(6)以長洲水利樞紐三線四線船閘引航道邊坡加固工程為例,進(jìn)一步闡明了高壓旋噴樁加固引航道軟土邊坡的變形破壞特性及合理加固結(jié)構(gòu)形式。采用飽和-非飽和土滲流固結(jié)理論,分析了航道水位變化對(duì)飽和-非飽和加固邊坡滲流場和穩(wěn)定性的影響,根據(jù)分析結(jié)果,為高壓旋噴樁加固引航道邊坡的設(shè)計(jì)施工提供了相關(guān)建議。
[Abstract]:In the course of the development and construction of the channel, there will inevitably be a large number of high slope of artificial excavation. There are many soft and unstable rock soil, such as clay, clay, fill, etc., the slope stability is insufficient, and the slope must be treated. Because the height of the slope is large, the slope line is long and the range is wide, the traditional anti slide pile scheme of reinforced concrete is used. At present, the construction cost is long and the construction cost is high. At present, the cement soil pile is formed by deep mixing method or high pressure jet grouting to reinforce the soft soil foundation in the engineering construction. But the cement soil pile is used for the foundation pit, the slope and the embankment and so on, the stability analysis has not yet unified standard compliance, the cement soil pile is added. The deformation and failure characteristics of the solid slope, the anti sliding mechanism, the reasonable structure of the pile and the design calculation theory are all lack of relevant research materials, and the theoretical research lags behind the engineering practice. Based on this, this paper, on the basis of the relevant research at home and abroad, through the indoor test, model test, numerical simulation, theoretical analysis and other methods, the cement soil pile is strengthened. The anti sliding characteristics of the slope, the working mechanism and the design calculation theory have been systematically studied. The main research work and conclusion are as follows: (1) the indoor test of 178 specimens has been completed, including the uniaxial compression, radial splitting and the three axis compression, and the strength and deformation behavior of the cement soil are analyzed. The shear expansion process of the cement soil is analyzed. In addition, the constitutive model and strength criterion suitable for describing the mechanical properties of cement soil materials are selected. (2) the principle, method and application of the limit equilibrium method and the finite element strength reduction method applied to the slope stability analysis are introduced in detail. The equivalence between the D-P strength criterion and the M-C strength criterion is analyzed and the related parameters are discussed. The results show that the effective range of the D-P criterion parameter a is 0 < < a < < < (?) /6.. The accuracy of the slope stability calculation is analyzed, and the yield criterion range adopted by the strength reduction method is extended. (3) the use of Abaqus bonding strength. The deformation and failure characteristics and the anti sliding mechanism of the cement soil pile reinforced slope are numerically simulated and analyzed. The results show that the cement soil pile is reinforced by the discrete cement soil pile, and when the slope is unstable, the cement soil pile with large stiffness and strength is flexural and damaged by the S flexure deformation. The traditional limit equilibrium method assumes that the pile is only shearing. The calculation results will overestimate the stability of the reinforced slope. The concept of the cement soil shear wall is put forward. Through numerical simulation, it is found that the cement soil shear wall is used to reinforce the slope, and the sliding force is adjusted between the shear wall and the slide body because of the friction force of the wall soil interface. The anti slip ability of the shear wall. (4) a horizontal shear model test of cement soil pile composite foundation is established by the geometric similarity constant of 20:1. The experimental results show the deformation and failure characteristics of the discrete cement soil pile and the cement soil shear wall, and the anti sliding mechanism is similar to the numerical simulation results. The model test results prove the combination of numerical simulation results. (5) based on the numerical simulation and model test research, the simplified calculation method of the overall stability analysis of several discrete cement soil piles is proposed. Through the analysis of 8 examples, it is proved that the equivalent shear strength method has higher precision and should be adopted in the design. Further, the support vector machine (SVM), particle swarm optimization (PSO) and the strength are strengthened. In combination with the degree reduction method (SRM), a SRM-SVM-PSO design optimization technique for cement soil shear wall strengthening slope is established, and the related program is compiled with Matlab. The calculation example shows that the safety and economy of the slope are full full by optimizing the design variables of the shear wall. (6) the side of the navigation channel edge of the three line and four line of Changzhou water control hub is on the edge of the ship lock. As an example, the deformation and failure characteristics of the soft soil slope reinforced by high pressure rotary jet grouting pile and the form of rational reinforcement structure are further clarified. The influence of the water level variation on the seepage field and stability of the saturated unsaturated soil slope is analyzed by the saturated unsaturated soil seepage consolidation theory. Some suggestions are put forward for design and construction of piles to reinforce the approach slopes.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU43

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