道路改扩建条件下石砌拱涵稳定性研究
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摘要
为研究张家口原公路改扩建为高速公路过程中,填土高度增加情况下石砌拱涵稳定性,采用有限差分数值计算方法,分析了不同填土高度情况下的拱涵-地基应力的变化规律。根据拱涵砌体的抗拉强度和抗压强度,建立砌体的等效粘聚力和内摩擦角,从而分析结构的安全系数。计算结果表明:结构体系的破坏主要源于地基的失稳,拱涵本身具有较高的安全系数。
In the course of old road at Zhangjiakou being reconstructed into expressway,the study has been carried out of the stability of stone arch culvert when filling height is increased,analysis is made of the change law of arch culvert-foundation stress under different filling height ussing finite difference method;and according to tensile and compressive strength of the masonry,its equivalent cohesive force and internal friction angle were established so as to analyze the structure's safety factor.The result shows that failure of the structural system is mainly caused by instable foundation while arch culvert itself has relatively high safety factor.
In the course of old road at Zhangjiakou being reconstructed into expressway,the study has been carried out of the stability of stone arch culvert when filling height is increased,analysis is made of the change law of arch culvert-foundation stress under different filling height ussing finite difference method;and according to tensile and compressive strength of the masonry,its equivalent cohesive force and internal friction angle were established so as to analyze the structure's safety factor.The result shows that failure of the structural system is mainly caused by instable foundation while arch culvert itself has relatively high safety factor.
引文
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[2]郑颖人,邱陈瑜,等.关于土体隧洞围岩稳定性分析方法的探索[J].岩石力学与工程学报,2008,27(10):254-260.
[3]张红,郑颖人,等.黄土隧洞安全系数初探[J].地下空间与工程学报,2009,5(2):297-306.
[4]乔金丽,张义同,等.强度折减法在盾构隧道开挖面稳定分析中的应用[J].天津大学学报,2010,43(1):14-20.
[5]郭院成,等.基于强度折减的边坡动力安全系数确定方法研究[J].土木工程学报,2012,45(2):117-120.
[6]李林科,等.基于强度折减法与极限平衡法的加筋高挡墙边坡稳定分析[J].兰州大学学报:自然科学版,2011,47(8):202-206.
[7]古海东,等.基于强度折减法的土钉支护结构稳定性分析[J].同济大学学报:自然科学版,2012,40(7):1003-1014.
[8]杨灵,等.基于强度折减法的巷道整体安全系数探讨分析[J].中国安全科学学报,2012,22(5):133-139.
[9]夏世友,等.有限差分强度折减法求解边坡安全系数[J].武汉工程大学学报,2012,34(4):19-26.
[10]肖强,郑颖人,等.有衬砌隧道设计计算探讨[J].地下空间与工程学报,2012,8(2):259-267.
[11]郑颖人.有限元极限分析法在隧洞工程中的应用[J].重庆交通大学学报:自然科学版,2011,30(12):1127-1137.
[12]JTGD63-2007公路桥涵地基与基础设计规范[S].北京:人民交通出版社,2007.
[13]刘红军.寒区湿地软土地基固结沉降与稳定性研究[D].中国地震局工程力学研究所,2007.
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