基于有限元的顺层坡桥梁群桩稳定性分析  

STABILITY ANALYSIS OF PILE GROUP OF BRIDGE WITH BEDDING SLOPE BY FINITE ELEMENT METHOD

作　　者：梁成立 肖海东 段永凤 王文杰 赵春龙 LIANG Chengli;XIAO Haidong;DUAN Yongfeng;WANG Wenjie;ZHAO Chunlong(Municipal General Contracting Department of Yunnan Construction Investment Holding Group Co.,Ltd.,Kunming 650500,China)

机构地区：[1]云南省建设投资控股集团有限公司市政总承包部,昆明650500

出　　处：《低温建筑技术》2022年第8期120-123,共4页Low Temperature Architecture Technology

摘　　要：顺层边坡滑坡是高速公路建设中常遇到的灾害类型,若桥梁设计不可避让顺层坡体,由于桩基本身抵抗水平推力能力较弱,边坡失稳产生的塑性滑动将引起桩基、桥墩的下沉、前移、倾斜,甚至桩基断裂等病害,将直接导致上部结构的损坏。为深入研究顺层坡上的桥梁桩基在施工及运营阶段稳定性,以云南某高速某矮塔斜拉特大桥主墩桩基为工程背景,收集现场地质资料,分析潜在滑动面的分布,采用Midas GTS建立有限元模型进行顺层边坡稳定性分析,结果表明在施工和运营过程中,边坡最大安全系数Fs小于1.25,不满足要求,建议采用嵌岩抗滑桩的加固方案对边坡进行支护,以保证桩基施工、运营安全。Bedding slope landslide is a disaster type often encountered in highway construction. If the bridge design cannot avoid bedding slope, it would lead to the damage of superstructure due to the weak resistance of the basic pile body to horizontal thrust, including the sinking, forward movement, inclination of pile foundation and pier, and the fracture of pile foundation. Taking the main pier pile foundation of a low pylon cable-stayed bridge of a high-speed in Yunnan as the case, the distribution of potential sliding surface through the on-site geological and geotechnical data was analyzed by using Midas GTS to establish a finite element model for the stability analysis of bedding slope.The results show that the maximum safety factor Fs of slope is less than 1.25 in the process of construction and operation, which does not meet the requirements. A reinforcement scheme of rock socketed anti slide pile is proposed, providing a reference for similar projects.

关 键 词：顺层边坡 有限Midas GTS 地基稳定性分析 抗滑桩加固 

分 类 号：TU473[建筑科学—结构工程]