原状土基础剪切法抗拔设计的可靠度校准分析  

Credibility Adjusting Analysis of Cut Method Resistance Drawing Design of Original State Earth Foundation

作　　者：徐彬[1] 曾二贤[1] 包永忠[1] 冯云巍[1] 

机构地区：[1]中南电力设计院,湖北武汉430071

出　　处：《电力勘测设计》2014年第3期58-63,67,共7页Electric Power Survey & Design

摘　　要：结合现行DL/T 5219-2005规定给出的"剪切法"抗拔设计方法及典型地区黏性土和戈壁滩碎石土的试验数据,应用可靠度理论建立输电塔原状土基础抗拔稳定的极限状态方程,确定剪切法计算变量的统计参数和分布规律。基于一次二阶矩法对原状土基础剪切法抗拔设计的可靠度水平进行校准分析,考察了分项系数、抗力变异性及计算模式不定性等参数的影响。结果表明:对黏性土,现行规定的剪切法抗拔设计的原状土基础可靠度指标β约为4.43;对戈壁滩碎石土,计算得到的可靠度水平更高。上述结论可为DL/T5219的修编提供参考。Based on the uplift design of shearing method by current DL/T 5219-2005 regulations and the test data of the typical area with clay plus the gobi desert soil, the uplift limit state equation of transmission line undisturbed soil foundation were proposed, and the statistical parameters plus distribution of shearing method calculation variable were determined. Using ＂the first order second order method＂, uplift design reliability level of undisturbed soil base were calibrated calculated, and the parameters sensitivity of partial factor, resistance variability plus calculation mode uncertainty were analysed. The results show that： For clayey soil, the undisturbed soil foundation uplift reliability index of shearing method by current regulation is about 3.89; For gobi desert soil, the calculated reliability index is higher. The above conclusions can be as references for DL/T5219 revision.

关 键 词：原状土基础 抗拔 可靠度校准 

分 类 号：TU312[建筑科学—结构工程]