考虑坡顶建筑荷载影响的边坡稳定性及加固设计优化研究

发布时间：2018-01-04 12:03

本文关键词：考虑坡顶建筑荷载影响的边坡稳定性及加固设计优化研究　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国西部地区大量的建筑建造于坡体环境之中,如何保证边坡及坡顶建筑的安全问题是岩土业界必须面对的理论及技术课题,边坡和坡顶建筑是一个相互作用的统一体系,当坡顶建筑基础至坡顶边缘的水平距离较近且坡顶建筑荷载较大时,建筑附加荷载将对边坡的变形及稳定性产生不利影响,可能导致边坡的稳定性降低、边坡滑裂面位置及滑动范围发生改变,甚至导致边坡产生过大变形或失稳;进而造成坡顶建筑地基土体由于侧向约束的弱化而发生不均匀沉降,导致坡顶建筑的开裂或倾倒。因此,边坡和坡顶建筑两者之间的相互影响不容忽视,实际工程设计分析中必须将两者作为一个共同作用的整体,进行综合考虑,从而保证边坡和建筑的安全。边坡的稳定性与边坡岩土体的物质组成、边坡岩土体的结构面产状、结构面组成物质的物理力学特性、边坡高度、边坡坡角、坡顶建筑荷载、建筑基础形式以及坡顶建筑基础至坡顶边缘的水平距离等因素有关,其中建筑基础形式的选择以及建筑基础至坡顶距离的远近对边坡及坡顶建筑的安全影响至关重要。山地建筑设计在保证建筑地基局部变形及稳定性的同时,必须同时兼顾建筑附加荷载对所处边坡变形及稳定性的影响,特别是坡顶建筑基础型式以及基础与坡顶安全距离的选择尤为重要,将关系到设计的成败及建筑运营的安全可靠,为保证边坡及坡顶建筑物的安全,尽快展开“考虑坡顶建筑荷载条件下的边坡稳定性及加固设计优化研究”势在必行。基于上述考虑,本文采用有限元数值分析软件Midas GTS NX建立二维建筑边坡分析模型,通过改变条形基础和桩基础两种基础型式与边坡坡顶的水平距离,分析在上部建筑荷载作用下边坡的稳定性,并求出不同基础形式下边坡的界限安全距离;力图揭示不同基础形式坡顶建筑对邻近边坡稳定性的影响,最终结合“大理13#建筑边坡加固设计工程”进行分析和验证,通过对该具体工程的论证分析寻找出最有的加固设计方案,本研究结论对坡顶建筑的设计及施工具有一定的指导意义,通过研究得出如下结论:1、同一边坡相同荷载的条件下,不同的基础形式,其附加应力影响范围不同,对边坡的稳定性以及潜在滑裂面的影响也不同。2、同一边坡相同荷载的条件下,不同基础形式对应的边坡界限安全距离不同。条形基础对应的边坡界限安全距离L 条小于桩基础对应的边坡界限安全距离L 桩;而且随着桩基础埋深不断加深,对应的边坡界限安全距离不断减小。3、同一边坡相同荷载的条件下,桩基础边坡比条形基础边坡的稳定性系数更大,边坡更加稳定;对于邻近高层建筑的边坡,建筑桩基础优于条形基础。4、桩基础埋深越深,上部建筑荷载通过桩基础在地基土中产生的附加应力对边坡稳定性影响越小,而桩基础埋深越浅,上部建筑荷载通过桩基础在地基土中产生的附加应力对边坡稳定性影响越大。5、对于采用桩基础的建筑边坡,建议桩基础埋深大于边坡坡高。6、对于在自然条件下稳定性系数大于国家规范要求的建筑边坡,可将基础布置在边坡的界限安全距离以内,虽然上部建筑通过条形基础形成的附加应力会对边坡造成不利影响,但要保证边坡稳定性系数满足国家规范的要求。7、对于在自然条件下稳定性系数不满足国家规范要求的建筑边坡,建议将基础布置在边坡的界限安全距离以外,同时保证边坡在最不利工况条件下不会发生滑动,即可保证建筑与边坡两者的稳定。8、若必须在不稳定边坡的界限安全距离内布置建筑基础,必须对该边坡进行加固治理,使得边坡稳定性系数满足国家规范要求。9、对于需要进行加固治理的建筑边坡,建议使用主动受力、变形较小、对边坡稳定性及建筑稳定性影响较小的支护措施,不易使用被动受力,对边坡、建筑扰动较大的支护措施。10、坡顶建筑在边坡的界限安全距离内,对边坡采用预应力锚索支护措施时,建议锚索的锚固段起始点最好越过建筑基础中心线部位。
[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.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU43;TU472

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