本文關鍵詞： 土工結構 安全系數(shù)定義 極限分析 極限平衡法 有限元極限分析　出處：《工程力學》2016年11期 　論文類型：期刊論文

【摘要】：以地基承載力、土坡穩(wěn)定等常見土工結構問題為例,討論土工結構安全系數(shù)的兩種不同定義,一是極限荷載與容許荷載之比,一是已有強度參數(shù)與保持穩(wěn)定所需強度參數(shù)之比。分析表明,前一定義僅對某些結構適用,而后一定義原則上可用于各種結構,具體選用要看結構及其所處環(huán)境的情況。當兩種定義均適用時,允許安全系數(shù)的取值可有較大差別,具體設計時應予注意。此外,還對兩種安全系數(shù)的計算方法進行了討論,包括滑移線法、極限平衡法、極限分析法等傳統(tǒng)方法以及近年來應用日趨廣泛的彈塑性有限元法、有限元極限分析法等,對各類方法的優(yōu)缺點及應用時需注意的問題給出自己的看法。
[Abstract]:In this paper, two different definitions of safety factor of geotechnical structures, such as bearing capacity of foundation and stability of soil slope, are discussed. One is the ratio of limit load to allowable load. The first is the ratio of existing strength parameters to those required to maintain stability. Analysis shows that the former definition applies only to certain structures, while the latter one can in principle be applied to various structures. The selection depends on the structure and its environment. When the two definitions are applicable, the values of the allowable safety factor may differ greatly, and attention should be paid to the specific design. In addition, the calculation methods of the two safety factors are also discussed. Including the slip line method, limit equilibrium method, limit analysis method and other traditional methods, as well as the elastoplastic finite element method, the finite element limit analysis method and so on, which have been widely used in recent years. The merits and demerits of various methods and the problems needing attention in application are given.
【作者單位】： 清華大學土木工程系;
【基金】：國家973計劃課題項目(2014CB047003)
【分類號】：TU43
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本文編號：1521719