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峡谷区域的地层,地质属性变异强烈,空间分布复杂。此条件下的嵌岩桩通常在斜坡基岩体中承载,其稳定性与承载性能受到基岩界面坡角的影响。传统地质勘查提供的工程地质剖面图受人工干预具有较大的随机性,并且无法为此类斜坡嵌岩桩提供充分的界面坡角设计参数。本文结合贵州某桥梁工程场地的钻孔勘察数据,采用克里格方法,通过变差函数分析了基岩埋深的空间变异规律;根据插值估计结果获得了较为直观有效的三维基岩界面形态预测图,以及工程场地内112根嵌岩桩对应的基岩界面坡度,得出需重点考虑斜坡基岩体影响的桩基分布范围。针对峡谷区域地层参数具有V型漂移趋势问题,通过选定合适的有效滞后距以限定准平稳带的范围,获得了较好的变差函数与预测效果。本文的研究成果,对深覆盖层嵌岩桩的承载力计算与施工设计具有较好的指导意义。
The strata in the gorge area have strong variation of geological attributes and complicated spatial distribution. The rock-socketed pile under this condition is usually carried in the bedrock body, and its stability and bearing capacity are affected by the slope angle of the bedrock interface. The traditional geological survey provides the engineering geological profile with a large randomness of human intervention, and can not provide enough parameters for the design of such rock slope piles. In this paper, based on the borehole survey data of a bridge project site in Guizhou, Kriging method was used to analyze the spatial variation of bedrock depth by variogram function. According to the interpolation estimation results, a more intuitive and effective three-dimensional bedrock interface morphology prediction And the slope of the bedrock interface corresponding to 112 rock-socketed piles in the project site, it is concluded that the distribution range of pile-foundation affected by the slope bedrock should be emphatically considered. Aiming at the V-shaped drift trend of formation parameters in the gorge area, the better variogram and prediction effect are obtained by selecting suitable effective hysteresis to limit the range of quasi-stationary zone. The research results in this paper have good guiding significance for bearing capacity calculation and construction design of deep overburden rock-socketed piles.