上海交通大学学报

上海交通大学学报

• •    

基于土拱效应和黄土改进应变楔模型的抗滑桩水平承载力计算（网络首发）

  

  1. 1. 长安大学建筑工程学院；2. 山东航空学院建筑工程学院
  • 基金资助:
    国家自然科学基金（41877285）资助项目；

Calculation of Horizontal Bearing Capacity of Anti-slide Piles Based on Soil Arching Effect and Improved Strain Wedge Model in Loess Sites

  1. (1. School of Civil Engineering, Chang’an University, Xi’an 710061, China；2. College of Civil Engineering and Architecture, Shandong University of Aeronautics, Binzhou 256600, Shandong, China)

PDF (PC)

32

摘要： 滑坡防治是当前地质灾害研究的热点之一，桩前被动土拱效应是影响抗滑桩水平承载力的重要因素，目前，考虑桩前被动土拱效应对抗滑桩桩身受力影响的研究尚不多见。在当前应变楔模型研究的基础上，对抗滑桩嵌固段的桩前被动土拱效应及土拱受力特点进行了分析，建立了考虑桩前被动土拱效应的排桩改进应变楔模型，并验证了其有效性。得到的主要成果有：引入桩前被动土拱并分析了被动土拱的受力特点，提出以被动土拱的破坏作为桩前土体破坏的判定条件；将群桩应变楔模型的前置计算宽度修正为1倍桩间距，可使排桩的被动土拱受力分析更加合理；考虑桩前土静止侧向压力对桩前土体和桩-土相互作用的影响，能使桩前被动土拱的土体应力状态求解更加合理，并使桩身内力与变形计算结果更为准确；本文提出的排桩改进应变楔模型能够更准确地反映邻桩相互作用时桩前土抗力的变化规律，研制的排桩内力和变形优化迭代计算程序可作为实际工程计算的新选择。

关键词: 抗滑桩, 被动土拱, 改进应变楔, 水平承载力, 黄土

Abstract: Study on the landslide prevention and control is one of the hot topics in geological hazards currently. The passive soil arching effect, adjacent to the piles, is an important factor influencing the horizontal load-bearing capacity of anti-slide piles. Regrettably, the investigation into the impact of passive soil arching effect on the internal force and deformation of anti-slide piles shaft remains somewhat limited. In response, building upon the existing strain wedge methodology, this study analyzed the passive soil arching effect and its mechanical characteristics along the embedded segment of anti-slide piles. Subsequently, an improved strain wedge calculation model for the row piles is proposed, effectively incorporating the passive soil arching effect in front of the anti-slide piles. Verification attests to the accuracy of this proposed model. The significant accomplishments of this research are as follows: with the introduction of the concept and the stress characteristic of passive soil arching ahead of the anti-slide piles, the judgment condition for the soil failure in front of anti-slide piles was proposed as the failure of the passive soil arching. Correcting the calculation width of the strain wedge front edge for pile group to 1 times the pile spacing, can make the passive soil arching stress analysis of row piles more reasonable. Considering the impact of static lateral soil pressure on the soil mass and pile-soil interaction in front of the anti-slide piles, can make the stress status calculation of passive soil arching more reasonable, furthermore, can make the calculation of internal forces and deformation of anti-slide piles shaft more rational. The improved strain wedge model for row piles proposed in this paper can more accurately reflect the variations law of soil resistance in front or anti-slide piles during the interaction between adjacent piles, and the developed iterative computation program for optimizing the internal force and deformation of row piles shaft can serve as a novel option for practical engineering computations.

Key words: anti-slide piles, passive soil arching, improved strain wedge, horizontal load-bearing capacity, loess

中图分类号: