摘要
为了研究人工高陡边坡段大直径灌注桩的受力性能和承载特性,开展了人工高陡边坡段大直径灌注桩的受力性能和数值模拟分析。提出了在人工高陡边坡段大直径灌注桩与桩基周围土体相互作用的内力计算公式,并利用MADAS GTS有限元软件建立有限元分析模型,研究了竖向荷载、桩长、边坡坡度、桩径等各种因素对桩基体系承载性状的影响,得出了竖向荷载的增大会增加桩基的受力和承载性能,但是在位移允许的情况下,决定桩基承载力的因素是桩身摩擦力;增大桩长可以有效的减小桩基沉降和水平位移,将桩基嵌入岩石层可以更大程度的控制桩基的沉降,同时减小桩基的内力;桩基选择在坡度较小的边坡上,使得桩基能够更好地进行承载;桩径的变化并不能较大的改变桩基的受力,而且会造成资源的消耗,所以实际工程中,不建议采用增大桩基直径的方法提高桩基的承载力。
In order to study the mechanical and bearing characteristics of large-diameter cast-in-place pile in high and steep slope section,the mechanical performance and numerical simulation analysis of large diameter cast-in-place pile in high and steep slope section are carried out.Using the finite element software of MADAS GTS to establish the finite element analysis model,the influence of vertical load,pile length,slope gradient and pile diameter on the bearing behavior of pile foundation system is studied,and it is concluded that the increase of vertical load will increase the bearing capacity of pile foundation,however,when the displacement is allowed,the factor determining the bearing capacity of pile foundation is the friction of pile body;enlarging the length of pile can effectively reduce the settlement and horizontal displacement of pile foundation,and embedding pile foundation into rock stratum can control the settlement of pile foundation to a greater degree and reduce the internal force of pile foundation at the same time;pile foundation is selected on the small slope,so that the pile foundation can better carry out the load;the variation of pile diameter cannot transform the stress of pile foundation largely,and it will cause the consumption of resources,so in the actual project,it is not recommended that to increase the diameter of pile foundation to improve the bearing capacity of pile foundation.
作者
万丹丹
宿文姬
郑志文
符诗存
WAN Dandan;SU Wenji;ZHENG Zhiwen;FU Shicun(Nansha District Construction Center of Guangzhou,Guangzhou 511455,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;Guangdong Geological Environment Monitoring Station,Guangzhou 510510,China)
出处
《华南地震》
2021年第2期113-118,共6页
South China Journal of Seismology
基金
广东省自然资源厅科技项目(GDZRZYKJ2020002)。
关键词
人工高陡边坡
大直径灌注桩
受力性能
承载特性
数值模拟
High steep slope
Large diameter cast-in-place pile
Mechanical properties
Numerical Simulation
