發(fā)布時間：2018-01-04 12:03

  本文關(guān)鍵詞：考慮坡頂建筑荷載影響的邊坡穩(wěn)定性及加固設(shè)計優(yōu)化研究　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 基礎(chǔ)形式 安全距離 潛在滑裂面 應(yīng)力影響范圍 強度折減法

【摘要】：我國西部地區(qū)大量的建筑建造于坡體環(huán)境之中,如何保證邊坡及坡頂建筑的安全問題是巖土業(yè)界必須面對的理論及技術(shù)課題,邊坡和坡頂建筑是一個相互作用的統(tǒng)一體系,當(dāng)坡頂建筑基礎(chǔ)至坡頂邊緣的水平距離較近且坡頂建筑荷載較大時,建筑附加荷載將對邊坡的變形及穩(wěn)定性產(chǎn)生不利影響,可能導(dǎo)致邊坡的穩(wěn)定性降低、邊坡滑裂面位置及滑動范圍發(fā)生改變,甚至導(dǎo)致邊坡產(chǎn)生過大變形或失穩(wěn);進而造成坡頂建筑地基土體由于側(cè)向約束的弱化而發(fā)生不均勻沉降,導(dǎo)致坡頂建筑的開裂或傾倒。因此,邊坡和坡頂建筑兩者之間的相互影響不容忽視,實際工程設(shè)計分析中必須將兩者作為一個共同作用的整體,進行綜合考慮,從而保證邊坡和建筑的安全。邊坡的穩(wěn)定性與邊坡巖土體的物質(zhì)組成、邊坡巖土體的結(jié)構(gòu)面產(chǎn)狀、結(jié)構(gòu)面組成物質(zhì)的物理力學(xué)特性、邊坡高度、邊坡坡角、坡頂建筑荷載、建筑基礎(chǔ)形式以及坡頂建筑基礎(chǔ)至坡頂邊緣的水平距離等因素有關(guān),其中建筑基礎(chǔ)形式的選擇以及建筑基礎(chǔ)至坡頂距離的遠近對邊坡及坡頂建筑的安全影響至關(guān)重要。山地建筑設(shè)計在保證建筑地基局部變形及穩(wěn)定性的同時,必須同時兼顧建筑附加荷載對所處邊坡變形及穩(wěn)定性的影響,特別是坡頂建筑基礎(chǔ)型式以及基礎(chǔ)與坡頂安全距離的選擇尤為重要,將關(guān)系到設(shè)計的成敗及建筑運營的安全可靠,為保證邊坡及坡頂建筑物的安全,盡快展開“考慮坡頂建筑荷載條件下的邊坡穩(wěn)定性及加固設(shè)計優(yōu)化研究”勢在必行。基于上述考慮,本文采用有限元數(shù)值分析軟件Midas GTS NX建立二維建筑邊坡分析模型,通過改變條形基礎(chǔ)和樁基礎(chǔ)兩種基礎(chǔ)型式與邊坡坡頂?shù)乃�平距離,分析在上部建筑荷載作用下邊坡的穩(wěn)定性,并求出不同基礎(chǔ)形式下邊坡的界限安全距離;力圖揭示不同基礎(chǔ)形式坡頂建筑對鄰近邊坡穩(wěn)定性的影響,最終結(jié)合“大理13#建筑邊坡加固設(shè)計工程”進行分析和驗證,通過對該具體工程的論證分析尋找出最有的加固設(shè)計方案,本研究結(jié)論對坡頂建筑的設(shè)計及施工具有一定的指導(dǎo)意義,通過研究得出如下結(jié)論:1、同一邊坡相同荷載的條件下,不同的基礎(chǔ)形式,其附加應(yīng)力影響范圍不同,對邊坡的穩(wěn)定性以及潛在滑裂面的影響也不同。2、同一邊坡相同荷載的條件下,不同基礎(chǔ)形式對應(yīng)的邊坡界限安全距離不同。條形基礎(chǔ)對應(yīng)的邊坡界限安全距離L 條小于樁基礎(chǔ)對應(yīng)的邊坡界限安全距離L 樁;而且隨著樁基礎(chǔ)埋深不斷加深,對應(yīng)的邊坡界限安全距離不斷減小。3、同一邊坡相同荷載的條件下,樁基礎(chǔ)邊坡比條形基礎(chǔ)邊坡的穩(wěn)定性系數(shù)更大,邊坡更加穩(wěn)定;對于鄰近高層建筑的邊坡,建筑樁基礎(chǔ)優(yōu)于條形基礎(chǔ)。4、樁基礎(chǔ)埋深越深,上部建筑荷載通過樁基礎(chǔ)在地基土中產(chǎn)生的附加應(yīng)力對邊坡穩(wěn)定性影響越小,而樁基礎(chǔ)埋深越淺,上部建筑荷載通過樁基礎(chǔ)在地基土中產(chǎn)生的附加應(yīng)力對邊坡穩(wěn)定性影響越大。5、對于采用樁基礎(chǔ)的建筑邊坡,建議樁基礎(chǔ)埋深大于邊坡坡高。6、對于在自然條件下穩(wěn)定性系數(shù)大于國家規(guī)范要求的建筑邊坡,可將基礎(chǔ)布置在邊坡的界限安全距離以內(nèi),雖然上部建筑通過條形基礎(chǔ)形成的附加應(yīng)力會對邊坡造成不利影響,但要保證邊坡穩(wěn)定性系數(shù)滿足國家規(guī)范的要求。7、對于在自然條件下穩(wěn)定性系數(shù)不滿足國家規(guī)范要求的建筑邊坡,建議將基礎(chǔ)布置在邊坡的界限安全距離以外,同時保證邊坡在最不利工況條件下不會發(fā)生滑動,即可保證建筑與邊坡兩者的穩(wěn)定。8、若必須在不穩(wěn)定邊坡的界限安全距離內(nèi)布置建筑基礎(chǔ),必須對該邊坡進行加固治理,使得邊坡穩(wěn)定性系數(shù)滿足國家規(guī)范要求。9、對于需要進行加固治理的建筑邊坡,建議使用主動受力、變形較小、對邊坡穩(wěn)定性及建筑穩(wěn)定性影響較小的支護措施,不易使用被動受力,對邊坡、建筑擾動較大的支護措施。10、坡頂建筑在邊坡的界限安全距離內(nèi),對邊坡采用預(yù)應(yīng)力錨索支護措施時,建議錨索的錨固段起始點最好越過建筑基礎(chǔ)中心線部位。
[Abstract]:A large building in the western region of China is built on the slope environment, how to ensure the safety of the slope and the top of the building is the theory and technology of the industry must face the topic of rock soil, slope and slope construction is a unified system of interaction, when the horizontal distance between the top edge of the building foundation to the top is near and the top of the building load the building is large, additional load will adversely affect the deformation and stability of slope, may reduce the stability of the slope, the slope sliding surface and the sliding range change, and even lead to excessive deformation or slope instability caused by slope; building foundation soil due to the weakening of lateral restraint and uneven subsidence the top building cause cracking or dumping. Therefore, the mutual influence between the slope and the slope of the building can not be ignored, the analysis in actual engineering design must be two people As a whole the interaction, comprehensive consideration, so as to ensure the safety of the building. And the slope stability and the slope of rock and soil slope material composition, structure of the slope of rock and soil surface occurrence, physical and mechanical properties, surface structure components of the slope height and slope angle, slope construction load, the basic form of the building the slope and building foundation to top edge of the horizontal distance and other factors, which is very important foundation form selection and construction effect of building foundation to the top of the distance on the slope and slope of the building. The mountain building design in building foundation to ensure local deformation and stability at the same time, must also take into account the impact of the additional loads on the building deformation and stability the slope of the slope, especially the building foundation and foundation and slope safety distance choice is particularly important in relation to the success of design and construction Build the safe and reliable operation, in order to ensure the safety of the building slope and slope, as soon as possible "to consider the slope stability of slope under the condition of building load and reinforcement design optimization research is imperative. Based on the above considerations, this paper used the finite element software Midas GTS NX to establish 2D building slope analysis model, by changing the strip foundation and pile foundation two kind of foundation and slope slope horizontal distance, slope stability analysis in superstructure loads, and find the boundaries of safe distance foundation slope; to reveal the effects of different forms of slope based on adjacent building slope stability, finally combined with the analysis and verification of design project of Dali 13# building slope reinforcement. Through the analysis of the specific demonstration project to find out some of the best reinforcement design scheme, the conclusion of the study on the top of building. Design and construction has certain guiding significance, the main conclusions are as follows: 1, the same with the slope load conditions, different foundation forms, the stress range, the stability of the slope and the potential slip surface has different effects of.2, with the same slope load under the condition of different slope the boundaries of safe distance corresponding to different foundation forms. The corresponding L distance less than a slope safety limit of pile foundation of strip foundation of the corresponding boundary slope safety distance of L pile and pile foundation; with depth deepening, the slope boundary corresponding safety distance decreases with the slope of.3, the same load conditions, the pile foundation slope larger than the strip foundation stability coefficient of slope, the slope is stable; slope to the adjacent high-rise building pile foundation, strip foundation pile foundation is better than that of.4, the deeper the depth, through the upper building load In pile foundation soil in the influence of additional stress on the stability of slope is small, and the more shallow the depth of pile foundation, superstructure load through the influence of additional stress on the slope stability is.5 in pile foundation, for the construction of slope by pile foundation, pile foundation depth is greater than the slope recommended.6 for high slope stability under natural conditions, the building slope coefficient is greater than the requirements of national standard, the basic layout within the bounds of slope safety distance, although additional superstructure formed by strip foundation stress will cause adverse effects on the slope, but to ensure that the slope stability coefficient to meet the national standard requirements for.7. Under natural conditions the stability coefficient of slope construction does not meet the requirements of national standard, suggestions will be arranged at the outside of the safe distance based limit slope, and ensure the slope under the most unfavorable working conditions Not slipping can ensure the stability of both the.8 architecture and the slope, if it must be based on boundaries of layout of buildings safety distance of slope instability, must to the slope reinforcement, the slope stability coefficient satisfies the requirements of national standard for.9, the need for reinforcement of the building slope, recommend the use of active force. Small deformation and impact on the slope stability and the stability of the building of smaller supporting measures, is not easy to use the passive force on the slope, building large disturbance supporting measures.10, the top building in a safe distance within the boundaries of the slope, slope with prestressed anchor cable supporting measures, anchorage cable over the best starting point proposal the center line of building foundation site.

【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU43;TU472

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