深基坑边坡土钉支护稳定性的可靠度分析

对土坡分析中较为经典的圆弧滑动法进行改进,使其可以同时考虑土钉的拔出破坏和强度破坏两种破坏形式。鉴于传统确定性方法的局限性,综合考虑了土钉与土体之间的界面摩阻力强度值,以及土体强度参数的不确定性,经过对各参数及参数间关系的处理,对土钉支护结构的内部稳定进行了可靠度分析,推导出可靠度的计算公式,最后通过具体实例验证了该法,为土钉支护的设计由传统的安全系数法向更为经济、科学的分项安全系数法转变提供参考和依据。

RELIABILITY ANALYSIS OF SOIL-NAIL RETAINING STRUCTURE FOR DEEP EXCAVATION

It is improved the classical arc glide method,which can analyze two failure modes: the soil nail's pull-out failure and its breakage.Since traditional certainty method has some instinct limitations,it is comprehensively considered the uncertainty of the friction strength value between the nail and soil,the strength factor of soil,and so on.After dealing with the factors and their relation,the reliability of the soil-nail retaining structure is analyzed and its calculating formula is deduced.Finally,the method is proved by an actual engineering example.So it can offer some reference and evidence to the design of the soil-nail retaining system from the traditional safety coefficient method to the more economic and scientific itemized safety coefficient method.