本文關(guān)鍵詞： 土工結(jié)構(gòu) 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(xué)》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(jié)構(gòu)問題為例,討論土工結(jié)構(gòu)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(qiáng)度參數(shù)與保持穩(wěn)定所需強(qiáng)度參數(shù)之比。分析表明,前一定義僅對某些結(jié)構(gòu)適用,而后一定義原則上可用于各種結(jié)構(gòu),具體選用要看結(jié)構(gòu)及其所處環(huán)境的情況。當(dāng)兩種定義均適用時(shí),允許安全系數(shù)的取值可有較大差別,具體設(shè)計(jì)時(shí)應(yīng)予注意。此外,還對兩種安全系數(shù)的計(jì)算方法進(jìn)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(yīng)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(diǎn)及應(yīng)用時(shí)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(xué)土木工程系;
【基金】：國家973計(jì)劃課題項(xiàng)目(2014CB047003)
【分類號】：TU43
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本文編號：1521719