考虑土体非均质和各向异性的锚索极限抗拔力研究  

Study of ultimate pullout force of anchor cable considering non-homogeneity and anisotropy of soil mass

作　　者：王洪涛[1,2] 王琦[1,2] 尤春安[3] 李术才[1] 王德超[1] 王新[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]山东科技大学山东省矿山灾害预防控制国家重点实验室培育基地,山东青岛266590 [3]山东科技大学土木建筑学院,山东青岛266590

出　　处：《岩土力学》2013年第8期2204-2210,共7页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973)项目资助(No.2013CB036000);国家自然科学基金资助(No.41102184);矿山灾害预防控制国家重点实验室培育基地开放基金资助(No.MDPC2012KF11)

摘　　要：考虑土体的非均质性与各向异性,结合预应力锚索锚固段土体的破裂形式,利用非线性强度准则,根据极限状态下力的平衡原理,推导出一个可考虑土体非均质性、各向异性与非线性破坏性质等多种因素影响的锚索极限抗拔力计算公式,并通过理论计算,分析土体非均质性、各向异性以及非线性强度系数对锚索极限抗拔力的影响。计算研究表明,土体的非均质性与各向异性对锚索抗拔力的影响显著,随着土体非均质常数的增加,锚索极限抗拔力不断提高,而随着各向异性系数与非线性强度系数的增加,抗拔力则有所下降;当土体非均质常数与各向异性系数提高时,土体破裂范围不断增大,研究结果可为锚索锚固体的设计提供一定参考。Considering the non-homogeneity and anisotropy of soil mass, according to the shape of rapture surface of anchor cable and nonlinear failure criterion, a formula of ultimate pullout force of anchor cable, considering the non-homogeneity, anisotropy, nonlinear failure characteristics and many＂ other factors, is deduced based on limit equilibrium principle. Theoretical calculations are conducted to analyze the influences of non-homogeneity parameters, anisotropy parameters and nonlinear parameters on ultimate pullout forces of anchor cables. The results reveal that, with the increase of non-homogeneity parameters, the ultimate bearing capacity of anchor cable increases; but with the increase of anisotropy parameters and nonlinear parameters, the beating capacity of anchor cable decreases; the rupture width expands with the increase of non-homogeneity parameters and anisotropy parameters, which provides a certain reference for the design of anchorage body.

关 键 词：非均质 各向异性 非线性强度准则 极限平衡 锚索 抗拔力 

分 类 号：TU433[建筑科学—岩土工程]