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新加坡残积土中大直径钻孔灌注桩的设计,目前是以静力公式计算极所得承载力为依据的.未充分考虑荷载传递机理和过分依赖桩载荷试验,导致了设计上的保守.一个较好的设计方法是采用一种既可提供沿技的荷载分布,又可估算完整的荷载——位移关系的荷载——位移分析法.根据附设仪器桩进行原型载荷试验的结果显示:新加坡残积土中钻孔灌注桩的受荷行为,与其他地区的硬粘土和软质岩石中钻孔灌注桩的受荷行为相同,那就是这种桩在上述土质中,在使用荷载状态下,桩的荷载传递主要受侧摩阻力控制.先前新加坡方面的研究亦显示标准贯入阻力与荷载传送参数间存在着简单的相关关系.本文中所举例子阐明所推荐采用的这些简单的相关关系和利用荷载传递分析法的设计方法,是现行设计方法的一种改进.
The design of large-diameter cast-in-place bored piles in residual soils in Singapore is currently based on the calculation of the ultimate bearing capacity obtained by the static formula. The load transfer mechanism and over-dependence on the pile load test are not fully considered, resulting in a conservative design. A good design method is to use a load-displacement analysis method that can provide the load distribution along the technology, but also can estimate the complete load-displacement relationship. According to the results of a prototype load test with attached instrument piles, the residual soil in Singapore shows: The loading behavior of bored piles is the same as the loading behavior of bored piles in hard clay and soft rock in other areas. That is the load of the piles in the above-mentioned soil under the condition of using load. The transmission is mainly controlled by lateral friction resistance. Previous Singapore studies also showed a simple correlation between the standard penetration resistance and load transmission parameters. The examples in this paper clarify the simple correlations recommended and the use of load transfer. Analysis method design method is an improvement of the current design method.