摘要
挤扩支护桩是一种先进的新型支护桩。通过掺入膨胀剂的钢筋混凝土扇形挤扩支护桩的试验研究,分析了其工作特性以及桩周土体挤密效应等,探讨了该桩在支护高度、桩身内力分配、内力计算等方面的规律。与普通混凝土扇形挤扩支护桩相比较,掺入膨胀剂的扇形挤扩支护桩弯矩最大值可减少20%～30%,桩顶位移平均减小33.5%,在正常使用极限状态下地面荷载提高13%。掺入膨胀剂的挤扩支护桩克服了普通挤扩支护桩混凝土收缩变形的缺点,有效地加固了桩周土体。
As a new type of advanced pile of retaining and protecting for foundation excavation, the squeezed scallop pile mixed expanding admixture is studied experimentally. The intention of this paper is to survey the compaction efficiency against soil around pile, the mechanism, the retaining height, the inner stress distribution and calculation of squeezed scallop pile mixed expanding admixture as retaining and protecting for foundation excavation. Compared with common reinforced concrete retaining piles, the major characteristics of squeezed scallop pile mixed expanding admixture contain： （1） The maximum bending moment is decreased 20 %-30 %; （2） The total displacement in top can be reduced 33.5 % on average; and （3） The ground limit load is increased 13 % under regular service conditions. Against the contraction distortion of common reinforced concrete piles, the squeezed scallop pile mixed expanding admixture as retaining and protecting can strengthen the soil around piles effectively.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第11期3139-3143,共5页
Rock and Soil Mechanics
关键词
掺入膨胀剂的扇形挤扩支护桩
工作特性
试验分析
计算方法
squeezed scallop pile mixed expanding admixture
characteristics
experimental analysis
calculation method
