基于地震波孔压静力触探(SCPTU)刚性桩承载力预测及荷载响应分析  

The capacity prediction and load response analysis of the rigid pile based on seismic piezocone penetration test(SCPTU)

作　　者：苗永红 蔡国军[1] 刘松玉[1] 

机构地区：[1]东南大学岩土工程研究所,江苏南京210096 [2]江苏大学,江苏镇江212013

出　　处：《煤炭学报》2011年第5期784-789,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50879011)

摘　　要：基于地震波孔压静力触探(SCPTU)资料对桩侧摩阻力和桩端承载力进行预测,同时提供了土层剖面特征。应用弹性理论通过实测的剪切波速估算初始桩土刚度。提出了修正双曲线法应用于弹性模量随着轴向荷载增大的非线性响应,实现了对刚性桩的荷载-沉降-承载力分析。结合不同土质条件工程实例分析,并通过统计和现场载荷试验验证了此方法的有效性和准确性。结果表明:考虑孔压修正的承载力估算法完全满足工程要求,新方法略微低估了承载力,可视为安全储备;新方法累计概率图平缓、离散性小,接近对数正态分布,具有更高可靠性;利用修正双曲线模量衰减法进行荷载响应分析具有较强的实用性。Based on the seismic piezocone penetration test（SCPTU）,pile side friction and base capacity were predicted and soil profile characteristics were also provided.According to the elastic theory,initial stiffness was estimated by the measured shear wave velocity.The modified hyperbola method was applied in axial load increases with the nonlinear responses,the rigid pile load-settlement-capacity was analyzed.In different soil conditions,the rigid piles case histories were conducted,also the effectiveness and accuracy of the method were verified by statistics and load tests.It is concluded that the new method based on revised pore pressure can completely satisfy the requirements,and it can be regarded as safety.The new method has small discrete,whose cumulative probability graph is flat,close to the lognormal distribution and higher reliability.Modified hyperbolic decay modulus method is useful for load response analysis.

关 键 词：地震波孔压静力触探(SCPTU) 刚性桩 承载力 荷载响应 竖向位移 

分 类 号：TU473.11[建筑科学—结构工程]