泵站单桩基础水平承载特性数值模拟分析  

Numerical Simulation on Horizontal Loading Characteristics of Single-pile Foundation in Pumping Station

作　　者：刘阳[1] 刘阳(男)[1] 李建方 

机构地区：[1]吉林省水利水电勘测设计研究院 规划设计处,长春130021

出　　处：《长江科学院院报》2015年第4期92-95,100,共5页Journal of Changjiang River Scientific Research Institute

摘　　要：岸边引水式泵站厂房受较大扬压力作用,同时承受较高的水平向荷载,且偏心距较大,即使增加泵站偏心重量,抗滑稳定安全系数和泵站基底大小应力也难以满足规范要求。而通过解析法研究单桩基础竖向荷载及水平荷载又比较困难,所以采用有限元数值分析,并考虑桩径、桩长、地基土弹性模量等因素的变化,对桩基弯矩与位移的影响进行分析。研究得出:约束桩顶、增加桩径、提高地基土弹性模量,对桩基抵制水平荷载贡献较大;而增加桩长、提高桩基混凝土弹性模量,对桩基抵抗水平荷载效果不明显。通过采用约束桩顶、增加桩径、提高地基土弹性模量等措施,泵站抗滑稳定安全系数及基底应力满足规范要求。Bankside diversion hydraulic pump station is subjected to large uplift pressure and horizontal load so that＆nbsp;the eccentricity is too large.Even if the eccentric weight of pumping station is increased,the anti-slide safety coef-ficient and base stress of pump couldn’t meet the requirements of specification.It’s difficult to research the verti-cal loads and horizontal loads of single-pile foundation by analytical methods.So finite element numerical analysis is employed in this paper to analyze the influences of pile diameter,pile length,elastic modulus of foundation soil on the bending moment and displacement of pile foundation.Results indicate that restraining pile top,increasing pile diameter and improving the elastic modulus of foundation soil contribute largely to resist the horizontal loads of pile foundation;while the effects of increasing pile length and improving the elastic modulus of concrete pile are not obvious.The anti-slide safety coefficient and base stress of pump could meet the requirements of specification by re-straining the pile top,increasing the diameter of pile,and improving the elastic modulus of foundation soil.

关 键 词：泵站 单桩基础 孔灌注桩 水平荷载 数值分析 

分 类 号：TV223[水利工程—水工结构工程]