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高层建筑嵌岩桩工程勘察涉及的地基土较为复杂,勘探孔的平面布置及孔深的确定都应在分析的基础上予以确定,勘察中有较多的问题容易被忽略,勘察成果报告往往对桩端标高及嵌岩桩深度的确定提供的确定依据及方法不够充分,给后续桩基设计带来一定的困扰。本文从勘察方案设计、岩层变化界线附近勘探点的加密、中风化岩层顶面标高等值线图的编制提供、岩层frk的选取及嵌岩桩单桩竖向极限承载力计算、桩基入岩判定等几个方面进行了实例分析,阐明了高层建筑嵌岩桩勘察中应注重的问题及其重要性。
The foundation soil involved in engineering investigation of rock-socketed pile in high-rise building is quite complicated. The layout of drilling holes and the determination of hole depth should be determined on the basis of analysis. More problems in investigation are easily overlooked. The determination of the pile-end elevation and the depth of rock-socketed pile provides insufficient basis and method for determining, which will bring certain troubles to the design of subsequent pile foundation. In this paper, from the design of prospecting scheme, the compilation of the topographic contour map at the top of the exploration site near the boundary of the change of strata, the selection of the rock frk and the calculation of the vertical ultimate bearing capacity of the rockfill piles, Judgments and several other aspects of the case analysis, illustrates the high-rise building rock-socked pile survey should pay attention to the problem and its importance.