堆载滑动对陡坡桥墩与桩基础力学特性的影响分析及其工程技术研究
发布时间：2019-01-03 15:09
【摘要】：陡坡地段桥梁桩基础由于其所处环境的影响,力学特性与平坡桩基差距大,加之施工时常将弃渣直接弃于桥下,加剧桥梁下部结构不均匀沉降;同时由于桥梁堆载的不稳定性,在降雨、地震等的因素影响下易造成坡体滑动等地质灾害,对桥梁桩基功能的发挥及桥梁整体安全性构成极大的威胁。为保障陡坡桥梁桩基功能的正常发挥及桥梁的整体安全性,对堆载滑动下陡坡桥墩与桩基础的力学特性及其工程技术进行研究十分必要。本文在分析国内外已有研究成果的基础上,采用理论计算与三维数值仿真分析方法,分别建立分析模型,结合现场监测数据,研究了堆载对陡坡桥梁桥墩及其桩基础的影响。依托百色至靖西高速公路工程项目坡南岭大桥,通过现场调研、监测,分析堆载滑动对桥梁的影响及破坏类型,并提出相应的工程技术,确保陡坡桥梁运营安全。论文研究发现,堆载引起的坡体滑动对陡坡桥墩及桩基础受力变形特性影响明显,内外侧墩柱及桩基础、柱、桩系梁在堆载作用下的力学特性不完全相同,当堆载坡体不稳定时,桥梁结构易在拉力及弯矩的综合作用下发生破坏。论文研究成果对确保依托工程坡南岭大桥基础的安全运营及维护起到了积极的指导作用,具有一定的理论和工程实用价值。
[Abstract]:Because of the influence of the environment of bridge pile foundation in steep slope section, the mechanical characteristics of bridge pile foundation differ greatly from that of flat slope pile foundation. In addition, the slag is often discarded directly under the bridge during construction, which intensifies the uneven settlement of the bridge substructure. At the same time, because of the instability of bridge load, it is easy to cause slope sliding and other geological disasters under the influence of rainfall and earthquake, which poses a great threat to the function of bridge pile foundation and the safety of the bridge as a whole. In order to guarantee the normal function of pile foundation of steep slope bridge and the overall safety of bridge, it is necessary to study the mechanical characteristics and engineering technology of pier and pile foundation under heap-load sliding. Based on the analysis of the existing research results at home and abroad, the theoretical calculation and three-dimensional numerical simulation methods are used to establish the analysis models respectively. Combined with the field monitoring data, the influence of surcharge on the pier of steep slope bridge and its pile foundation is studied. Based on Baise to Jingxi Expressway Project, this paper analyzes the influence and damage type of the bridge caused by heaped sliding through field investigation and monitoring, and puts forward the corresponding engineering technology to ensure the safety of steep slope bridge operation. In this paper, it is found that the slope sliding caused by the heaped load has obvious influence on the mechanical deformation characteristics of the pier and pile foundation on the steep slope, and the mechanical properties of the inside and outside pier column and pile foundation, the column and the pile system beam under the surcharge are not exactly the same. When the heaped slope body is unstable, the bridge structure is easily destroyed under the combined action of tension and bending moment. The research results of this paper play an active guiding role in ensuring the safe operation and maintenance of the foundation of the Po-Nanling Bridge relying on the project, and have certain theoretical and engineering practical value.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.15;U443.22
本文编号：2399550
[Abstract]:Because of the influence of the environment of bridge pile foundation in steep slope section, the mechanical characteristics of bridge pile foundation differ greatly from that of flat slope pile foundation. In addition, the slag is often discarded directly under the bridge during construction, which intensifies the uneven settlement of the bridge substructure. At the same time, because of the instability of bridge load, it is easy to cause slope sliding and other geological disasters under the influence of rainfall and earthquake, which poses a great threat to the function of bridge pile foundation and the safety of the bridge as a whole. In order to guarantee the normal function of pile foundation of steep slope bridge and the overall safety of bridge, it is necessary to study the mechanical characteristics and engineering technology of pier and pile foundation under heap-load sliding. Based on the analysis of the existing research results at home and abroad, the theoretical calculation and three-dimensional numerical simulation methods are used to establish the analysis models respectively. Combined with the field monitoring data, the influence of surcharge on the pier of steep slope bridge and its pile foundation is studied. Based on Baise to Jingxi Expressway Project, this paper analyzes the influence and damage type of the bridge caused by heaped sliding through field investigation and monitoring, and puts forward the corresponding engineering technology to ensure the safety of steep slope bridge operation. In this paper, it is found that the slope sliding caused by the heaped load has obvious influence on the mechanical deformation characteristics of the pier and pile foundation on the steep slope, and the mechanical properties of the inside and outside pier column and pile foundation, the column and the pile system beam under the surcharge are not exactly the same. When the heaped slope body is unstable, the bridge structure is easily destroyed under the combined action of tension and bending moment. The research results of this paper play an active guiding role in ensuring the safe operation and maintenance of the foundation of the Po-Nanling Bridge relying on the project, and have certain theoretical and engineering practical value.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.15;U443.22
【共引文献】
相关期刊论文 前2条
1 尹平保;赵明华;杨超炜;杨明辉;;复杂荷载下横坡段桥梁桩基承载特性试验研究[J];土木工程学报;2014年05期
2 李忠庚;徐金明;吴红斌;;桥梁工程施工及运营对岩体边坡稳定性的数值分析[J];上海大学学报(自然科学版);2014年05期
，本文编号：2399550
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