贵州地区泥(砂)岩层桩端阻力试验研究  

Experimental study on pile end resistance in mudstone and sandstone layers in Guizhou

作　　者：戴国亮[1,2] 杨超[1] 龚维明[1,2] 

机构地区：[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

出　　处：《建筑结构》2013年第19期95-98,68,共5页Building Structure

基　　金：国家自然科学基金资助项目(50908048);国家科技支撑计划项目(2011BAG07B01)

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)。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）.

关 键 词：泥岩 砂岩 桩端阻力 承载力系数 

分 类 号：TU398.7[建筑科学—结构工程]