贵州地区泥（砂）岩层桩端阻力试验研究*
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戴国亮1，2，杨超1，龚维明1，2(1 东南大学土木工程学院， 南京 210096; 2 东南大学混凝土及预应力混凝土结构教育部重点实验室， 南京 210096)［摘要］桩端阻力的大小直接与岩石单轴抗压强度成比例，通常情况下，其计算方法是完整岩石单轴抗压强度与承载力系数的乘积，而承载力系数的大小与岩石种类、嵌岩深度、岩石质量等级有直接关系。通过对贵阳地区某工程14个泥（砂）岩端阻载荷试验，分析了岩石种类和风化程度对桩的极限端阻力的影响。结果表明,泥岩风化程度不同，其桩端载荷-位移曲线的初始直线段斜率相差不大；计算出来的极软岩（泥岩）承载力系数远大于软岩（砂岩）。［关键词］泥岩; 砂岩; 桩端阻力; 承载力系数中图分类号：TU398.7 文献标识码：A 文章编号：1002-848X(2013)19-0095-04Experimental study on pile end resistance in mudstone and sandstone layers in GuizhouDai Guoliang1,2, Yang Chao1, Gong Weiming1,2(1 School of Civil Engineering, Southeast University, Nanjing 210096, China; 2 Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China)Abstract: The pile end resistance, which is proportional to the uniaxial compressive strength of intact rock, is the product of uniaxial compressive strength of intact rock and the bearing coefficients while the bearing coefficients are related to the rock type, socket depth and rock mass rating. Based on 14 static loading tests in mudstone and sandstone layers in Guiyang, the effects of rock type and weathering degree on pile end ultimate resistance were analyzed. Results indicate the slope of initial line segment of base resistance-displacement curve nearly keep the same for different weathering degree of mudstone. The bearing coefficient of the weaker rock (mudstone) is far larger than that of weak rock (sandstone).Keywords: mudstone; sandstone; pile end resistance; bearing coefficient*国家自然科学基金资助项目（50908048），国家科技支撑计划项目（2011BAG07B01）。作者简介：戴国亮，博士，教授，博士生导师，Email:dailg@seu.edu.cn。参考文献［1］ZHANG L and EINSTEIN H. End bearing capacity of drilled shafts in rock［J］. Journal of Geotechnical and Geoenviromental Engineering, 1998, 124 (7): 574-584.［2］TENG W C. Foundation design［M］. Prentice-Hall Inc., Englewood Cliffs, N. J., 1962.［3］COATES D F. Rock Mechanics Principle［M］. Department of Energy Mines and Resources, Ottawa, Canada,1967: 874-892.［4］PELLS P J. Theoretical and model studies related to the bearing capacity of rock［C］//In Proceedings of Sydney Group of Australian Geomechanics Society. Institute of Engineers, Australia, 1977.［5］ROWE R K, ARMITAGE H H. A design method for drilled piers in soft rock［J］. Canadian Geotechnical Journal, 1987, 24(1):126-142.［6］ARGEMA.Design guides for offshore structures:offshore pile design［M］.Association de Recherche en Geotechnique Marine.Paris,France:Editions Technip,1992.［7］ZHANG L. Prediction of end-bearing capacity of rock-socketed shafts considering rock quality designation (RQD)［J］. Canadian Geotechnical Journal, 2010, 47(10): 1071-1084.［8］SEOL H, JEONG S, KIM Y M. Load transfer analysis of rock-socketed drilled shafts by coupled soil resistance［J］. Computer and Geotechnics, 2009, 36: 446-453.［9］GB 50007—2011建筑地基基础设计规范［S］. 北京：中国建筑工业出版社, 2012.［10］GB 50021—2001岩土工程勘察规范［S］. 北京：中国建筑工业出版社, 2002.
