ANALYSIS OF LOAD TRANSFER OF ROCK-SOCKETED PILES BASED ON CHARACTERISTICS OF PILE-ROCK STRUCTURAL PLANE
ANALYSIS OF LOAD TRANSFER OF ROCK-SOCKETED PILES BASED ON CHARACTERISTICS OF PILE-ROCK STRUCTURAL PLANE
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发表时间：
2009
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通讯作者：
L. Xiaoming
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作者：
L. Xiaoming
嵌岩桩的荷载传递特性主要由岩石-混凝土界面的剪切行为决定。基于桩-岩与围岩界面的剪胀和破坏机制，建立了适用于软弱嵌岩桩的新的表皮摩擦荷载传递函数，得到了围岩破坏和弹性条件下单桩摩阻和轴力的解析解，并得到了临界桩长的解析解。讨论了摩阻和轴力沿桩长的分布情况,从理论上解释了桩径、桩岩模量比和剪胀角对嵌岩桩荷载传递特性的影响,并为嵌岩桩设计提出了一些有益的建议。此外,引入了影响参数η作为嵌岩桩承载性能的宏观调控指标,近似考虑了各因素的综合影响作用。分析发现，相同条件下，η值越高，嵌岩桩的承载性能越好，桩体所能承受的极限荷载越大。工程实例对比分析结果表明，该方法计算值与实测数据吻合较好。
The load transfer characteristics of rock-socketed pile are mainly decided by the shear behavior of rock-concrete interface.Based on the dilatancy and failure mechanisms of the interface between pile-rock and surrounding rock,a new load transfer function of skin friction suitable for the weak rock-socketed piles is set up;analytical solutions for the friction and axial force of single pile are obtained under the conditions of failure and elasticity of the surrounding rock;and the analytical solution of critical pile length is obtained as well.On the basis of those,the distributions of frictional resistance and axial force along the pile length are discussed,which can explain theoretically that the diameter of pile,pile-rock modulus ratio and dilatancy angle influence the load transfer characteristics of rock-socketed piles;and some useful suggestions for rock-socketed pile design are also proposed.Moreover,an influential parameter η,which is used as macro-control guideline of rock-socketed pile bearing performance,is introduced to consider the comprehensive influential effect of various factors approximately.From analysis,it is found that,under the same condition,the higher the value of η is,the better the rock-socketed pile bearing performance is,and the bigger the pile ultimate load can sustain.Comparative analysis result of an engineering example shows that the values calculated by the presented method agree well with the measured data.