工字型板式抗滑结构受力与变形特性试验研究  

Experimental Research on the Mechanical and Deformation Characteristics of Anti-slide Structure with I-shaped Plate

作　　者：郑静 安孟康 吕昌明 苏俊霞 ZHENG Jing;AN Mengkang;LU Changming;SU Junxia(Northwest Research Institute Co.Ltd of CREC,Lanzhou,Gansu 730000,China;China Railway First Survey and Design Institute Group Co.Ltd,Xi'an,Shaanxi 710000,China)

机构地区：[1]中铁西北科学研究院有限公司,兰州730000 [2]中铁第一勘察设计院集团有限公司,西安710000

出　　处：《铁道工程学报》2022年第5期1-7,共7页Journal of Railway Engineering Society

基　　金：中国中铁股份有限公司重点课题(2013-重点-32)。

摘　　要：研究目的:现有的抗滑结构仍以矩形和圆形截面抗滑桩为主,但其材料消耗量均较大,有进一步优化的余地。因此本文提出工字型板式抗滑新结构,但需通过试验对其受力与变形特性、腹板的设置与连接进行研究,以期为理论计算与设计提供依据。研究结论:(1)工字型板式抗滑结构的变形与腹板设置深度和连接有关,腹板设置愈深,结构顶部位移愈小,抗变形能力愈强;现浇刚接较预制拼装结构抗变形能力更强;(2)结构所受推力近似呈梯形分布,腹板设置愈深,推力合力作用点愈低;(3)内外板弯矩分布呈反S状,反弯点在滑面附近,表现为柔性结构的受力特点;(4)腹板设置深度加深,内外板的正负极值弯矩、顶板最大弯矩和腹板最大应力均减小,但内、外板自身正负弯矩极值相差增大,板的受力不均;(5)腹板设置深度以深入滑面以下一定深度为宜;(6)本研究成果可在滑坡与边坡病害治理中推广应用。Research purposes: The existing anti-slide structures are still mainly rectangular and circular section anti-slide piles, but their material consumption is larger, and there is space for further optimization. Therefore, this paper proposed a new anti-slide structure of I-shaped plate, its stress and deformation characteristics, the setting and connection of web plate need to be studied through experiments, in order to provide a basis for theoretical calculation and design.Research conclusions:(1)The deformation of the I-shaped plate anti-slide structure is related to the depth and connection of the web. The deeper the web is set, the smaller the displacement of the top of the structure and the stronger the deformation resistance. The anti deformation ability of cast-in-place rigid joint structure is stronger than that of precast assembly structure.(2) The thrust force distribution of the structure is approximately trapezium. The deeper the web is set, the lower the action point of thrust resultant force.(3) The bending moment distribution of the inner and outer plates is in reverse "S" shape, and the reverse bending point is near the sliding surface, which shows the mechanical characteristics of the flexible structure.(4) With the deepening of web setting depth, the positive and negative extreme bending moment, the maximum bending moment of the roof and the maximum stress of the web decrease, but the difference in absolute value between the positive and negative extreme bending moment of the inner and outer plates increases, and the stress of the plate is uneven.(5) The web should be set to a certain depth below the sliding surface.(6) The research results can be popularized and applied in the treatment of landslide and diseased slope.

关 键 词：工字型结构 板式抗滑结构 受力特性 变形特性 

分 类 号：U213.152[交通运输工程—道路与铁道工程]