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工程科学与技术:2011,43(6):79-84
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一种高切坡超前支护桩的作用机制
(1.中国科学院水利部 成都山地灾害与环境研究所,山地灾害与地表过程重点实验室;2.中国科学院 研究生院;3.中国市政工程 西南设计研究总院)
Study on the Mechanism of a Kind of Pre-reinforced Pile
(1.China Inst. of Mountain Hazards and Environment,Key Lab. of Mountain Hazards and Surface Process, Chinese Academy of Sciences;2.Graduate School of the Chinese Academy of Sciences;3.Southwest Municipal Eng. Design & Research Inst. of China)
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投稿时间:2011-01-04    修订日期:2011-06-03
中文摘要: 高切坡超前支护桩能有效地抑制边坡的变形,确保开挖边坡的稳定性。但常规钢筋混凝土超前支护桩的刚度大,导致施加在桩体上的土压力较大,为解决这一问题,提出在超前支护桩体靠山侧设置一层EPS垫层材料以降低超前支护桩与变形坡体之间的作用力。采用数值分析方法,研究了EPS垫层材料类型、厚度、刚度对超前支护桩土压力、桩身变形以及桩身内力的影响,揭示了EPS垫层材料对超前支护桩作用机制的影响。研究结果表明:EPS垫层的厚度和密度对超前支护桩桩土共同作用有显著影响。超前支护桩后布置的EPS垫层厚度越大,超前支护桩上的土压力越小,桩身位移越小,桩身内力越小;超前支护桩后布置的EPS垫层密度越小,超前支护桩上的土压力越小,桩身位移越小,桩身内力越小。
中文关键词: 超前支护桩  EPS材料  高切坡  数值模拟
Abstract:Pre-reinforced pile in high cutting slope can reduce the displacement of the slope and ensure the stabilization of the slope. Because of the largely structural stiffness of concrete pre-reinforced pile, the earth pressure acting on pile increases. In order to settle this problem, a layer of EPS backs on to the pre-reinforced pile was set to decrease the interaction force of pre-reinforced piles. Finite element analysis software of ANSYS was used to analyze the value and distribution of displacement, shearing force and bending moment acted on the pre-embedded pile with different thickness and types of EPS backs on to the pre-reinforced pile. The results showed that the thickness and types of EPS have large influence on pre-reinforced piles. With the increase of the thickness of EPS, the earth pressure acting on pile decreases, the displacement of pre-reinforced pile decreases, and the inner force of pre-reinforced pile decreases. With the decrease of the density of EPS, the earth pressure acting on pile decreases, the displacement of pre-reinforced pile decreases, and the inner force of pre-reinforced pile decreases.
文章编号:201100006     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(40872181);交通部西部科技项目(2008-318-792-85)
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引用文本:
何思明,罗渝,何尽川.一种高切坡超前支护桩的作用机制[J].工程科学与技术,2011,43(6):79-84.
He Siming,Luo Yu,He Jinchuan.Study on the Mechanism of a Kind of Pre-reinforced Pile[J].Advanced Engineering Sciences,2011,43(6):79-84.