岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2014年
2期
389-396
,共8页
张敏%马建林%苏权科%吴伟胜%刘凯锐
張敏%馬建林%囌權科%吳偉勝%劉凱銳
장민%마건림%소권과%오위성%류개예
模型试验%钢管复合桩%剪力环%泥皮%防腐涂层%工作性能
模型試驗%鋼管複閤樁%剪力環%泥皮%防腐塗層%工作性能
모형시험%강관복합장%전력배%니피%방부도층%공작성능
model test%steel tubular composite pile%shear ring%drilling mud skin%anticorrosion coating%working performance
依托港珠澳大桥建设，通过5组不同组合的钢管复合桩模型试验，其中2组试件设有剪力环，开展了内置剪力环、泥皮和防腐涂层对钢管复合桩工作性能影响的研究，比较和分析试件的荷载-变形曲线、截面变形规律、钢管与剪力环变形等。试验结果表明，剪力环、泥皮和防腐涂层对钢管复合桩的工作性能具有一定的影响；泥皮和防腐涂层使钢管复合桩的黏结强度降低，而剪力环加强了钢管与核心混凝土的联结，钢管的受力及变形显著增加。在泥皮、防腐涂层和剪力环共同作用下，桩截面变形呈“倒 v”或“m”型，不再满足经典力学的平截面变形假定。在泥皮、防腐涂层和剪力环间距S ≤2D（D为桩径）的条件下，剪力环的嵌固作用可以完全克服泥皮和防腐涂层的不利影响。在试验结果研究的基础上，进一步探讨泥皮、防腐涂层和剪力环不同组合下钢管复合桩的刚度计算问题，并给出了在弹性阶段范围内钢管复合桩刚度计算公式，泥皮（厚度0.1 mm）和防腐涂层使其刚度降低，剪力环则使其增加。其研究结果可为钢管复合桩基工程设计提供重要的参考。
依託港珠澳大橋建設，通過5組不同組閤的鋼管複閤樁模型試驗，其中2組試件設有剪力環，開展瞭內置剪力環、泥皮和防腐塗層對鋼管複閤樁工作性能影響的研究，比較和分析試件的荷載-變形麯線、截麵變形規律、鋼管與剪力環變形等。試驗結果錶明，剪力環、泥皮和防腐塗層對鋼管複閤樁的工作性能具有一定的影響；泥皮和防腐塗層使鋼管複閤樁的黏結彊度降低，而剪力環加彊瞭鋼管與覈心混凝土的聯結，鋼管的受力及變形顯著增加。在泥皮、防腐塗層和剪力環共同作用下，樁截麵變形呈“倒 v”或“m”型，不再滿足經典力學的平截麵變形假定。在泥皮、防腐塗層和剪力環間距S ≤2D（D為樁徑）的條件下，剪力環的嵌固作用可以完全剋服泥皮和防腐塗層的不利影響。在試驗結果研究的基礎上，進一步探討泥皮、防腐塗層和剪力環不同組閤下鋼管複閤樁的剛度計算問題，併給齣瞭在彈性階段範圍內鋼管複閤樁剛度計算公式，泥皮（厚度0.1 mm）和防腐塗層使其剛度降低，剪力環則使其增加。其研究結果可為鋼管複閤樁基工程設計提供重要的參攷。
의탁항주오대교건설，통과5조불동조합적강관복합장모형시험，기중2조시건설유전력배，개전료내치전력배、니피화방부도층대강관복합장공작성능영향적연구，비교화분석시건적하재-변형곡선、절면변형규률、강관여전력배변형등。시험결과표명，전력배、니피화방부도층대강관복합장적공작성능구유일정적영향；니피화방부도층사강관복합장적점결강도강저，이전력배가강료강관여핵심혼응토적련결，강관적수력급변형현저증가。재니피、방부도층화전력배공동작용하，장절면변형정“도 v”혹“m”형，불재만족경전역학적평절면변형가정。재니피、방부도층화전력배간거S ≤2D（D위장경）적조건하，전력배적감고작용가이완전극복니피화방부도층적불리영향。재시험결과연구적기출상，진일보탐토니피、방부도층화전력배불동조합하강관복합장적강도계산문제，병급출료재탄성계단범위내강관복합장강도계산공식，니피（후도0.1 mm）화방부도층사기강도강저，전력배칙사기증가。기연구결과가위강관복합장기공정설계제공중요적삼고。
To investigate the effects of shear ring, drilling mud skin and anticorrosion coating on performances of steel tubular composite (STC) piles, five model tests with different combinations of shear ring, drilling mud skin and anticorrosion coating are conducted; two of them are with shear ring, relying on the construction of the Hong Kong-Zhuhai-Macao Bridge. The load-deformation curves and deformations of cross-section, steel tube and shear ring have been compared and analyzed. The results obtained from the tests show that the bond strength of STC pile is reduced by drilling mud skin and anticorrosion coating, while the performances of steel tube are improved by shear ring. The cross-section deformation of pile shows"inverted v"or"m"type;it no longer meets section deformation assumption of classical mechanics. The disadvantage effects of drilling mud skin and anticorrosion coating can be completely overcome by the shear ring, when its spacing is less than 2D (D is pile’s diameter). Based on the test results, the stiffness calculation of STC pile has been discussed and the stiffness calculation formula in elastic stage has been given. The stiffness of STC pile is reduced by drilling mud skin with thickness of 0.1 mm and anticorrosion coating, which is improved by shear ring. The paper will provide references for STC pile’s design.
