滑坡推力计算方法的对比研究与应用
程建军[1,2] 廖小平[2] 王浩[1] 刘代文[3]
[1]中国铁道科学研究院,北京100081 [2]中铁西北科学研究院,兰州730000 [3]福州大学土木工程学院,福州350002
摘 要:
滑坡推力计算方法可以概括为传递系数法、刚体极限平衡分析方法和有限元数值法等三类。传递系数法被工程技术人员所广泛应用,但随着滑(边)坡稳定性分析计算理论的发展,传统传递系数法有将逐步被先进而更实用的方法所取代的趋势;Morgenstem-Price法为刚体极限平衡分析方法的代表之一,这类方法在滑动面出现反坡段时计算结果偏于不合理;有限元数值法在模拟路堑开挖边坡时应追踪实际的应力场变化过程、依序建模,才能更符合工程实际,有限元数值法能同时得到滑坡推力与桩身内力图,比“K”法优越之处为能反映出由岩土本身性质的差异所造成的滑面下桩侧应力值差异。对比分析结果显示,有限元数值法进行滑坡推力计算结果较为合理,有必要进一步分析研究与推广应用。[著者文摘]
文章出处:
《水文地质工程地质》-2008年1期 -44-48页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-3665(2008)01-0044-05
Micro-structural effect of sheer failure in structured hydraulic fill
CHENG Yu-xiang , DU Dong-ju , LI Zhong-liang ( 1. Chang' an University, Xi' an 710054, China ;2. Tianjin Institute of Urban Construction, Tianjin 300384, China)
Abstract:
Through compression test, shear test and sensitivity test, the structure of hydraulic fill is studied, and the result shows that the hydraulic fill microstructure has great influence on its mechanical properties, so it is a kind of strong structured soil. The soil samples are analyzed quantitatively by micro-structure SEM pictures of shear test, and the relation of the void and structure unit body microstructure parameter with axial strain is studied. The microstructural effect of hydraulic fill shearing failure is analyzed in brief. It is found that the shearing failure process of hydraulic fill can be divided into three stages : (a) compression of gas in void and migration of the moisture content;(b) spallation of the pellet, grain slippage and structure damage; and (c) formation of new structure.[著者文摘]
Key words:
hydraulic fill; structural constitution; sheer process; micro-structural effect

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