地震作用下土钉支护边坡稳定性计算方法
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摘要
考虑土钉对土质边坡稳定性影响的情况下,根据土体边坡滑动面的破坏模式,拟静力法,建立了地震作用下土钉支护边坡稳定性模型,推导了边坡滑移面圆心位置与稳定系数之间的函数关系。在水平地震作用下,竖向条分在计算地震惯性力和抗滑力矩时存在计算上的不合理,从而使地震惯性力与实际值有误差,抗滑力矩偏小,因此采用竖向条分和水平条分结合的方法对土钉支护边坡地震稳定性分析方法进行了改进。利用遗传算法对最危险滑移面的圆心进行动态搜索,并且避免了在圆弧搜索中陷入局部最小值的缺点。采用面向对象程序设计语言VC++编制了程序,实现了上钉支护边坡稳定最小安全系数的自动寻优。最后结合具体工程实例进行了验算,结果表明这种计算方法对土质较均匀的黄土地区是适用的。
Considering soil nailing effects on stability of a soil side-slope,according to the damage model of its slip surface,the limit equilibrium theory and the pseudo static approach,its seismic stability model and a searching model of its most dangerous slip surface were set up.The function relationship between stability coefficient and the center of its circular slip surface was derived.Errors should be induced in calculating horizontal seismic inertial force and anti-sliding moment according to vertical slice.The seismic stability analysis method of the slope protected by soil sailing was improved using horizontal and vertical slice methods.Calculation of the stability of the slip surface was carried out using genetic algorithms.It could avoid getting in local minimum in optimal searching.Using object-oriented programming language VC++,a computing program was made to realize the optimization.Finally,the method was used to a case study.The results showed the proposed method is credible.
Considering soil nailing effects on stability of a soil side-slope,according to the damage model of its slip surface,the limit equilibrium theory and the pseudo static approach,its seismic stability model and a searching model of its most dangerous slip surface were set up.The function relationship between stability coefficient and the center of its circular slip surface was derived.Errors should be induced in calculating horizontal seismic inertial force and anti-sliding moment according to vertical slice.The seismic stability analysis method of the slope protected by soil sailing was improved using horizontal and vertical slice methods.Calculation of the stability of the slip surface was carried out using genetic algorithms.It could avoid getting in local minimum in optimal searching.Using object-oriented programming language VC++,a computing program was made to realize the optimization.Finally,the method was used to a case study.The results showed the proposed method is credible.
引文
[1]朱彦鹏,李忠.深基坑土钉支护稳定性分析方法的改进及软件开发[J].岩土工程学报,2005,27(8):939-943.
[2]朱彦鹏,王秀丽,狄生奎,等.黄土边坡建筑的抗滑移设计[J].甘肃工业大学学报,2002,28(2):85-89.
[3]朱彦鹏,王秀丽,张贵文,等.兰州中广大厦超长深基坑支护的设计、施工与实验监测[J].工程力学(增刊),2003,336-341.
[4]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004,2.
[5]李海深,杨果林,邹银生.加筋土挡土墙动力特性分析[J].中国公路学报,2004,17(2):28-32.
[6]董建华,朱彦鹏.地震作用下土钉支护高速公路边坡动力参数分析[J].西安建筑科技大学学报(自然科学版).2007,39(5):661-666.
[7]国家标准.《建筑边坡工程技术规范》(GB50330-2002).北京:中国建筑工业出版社,2002.
[8]国家标准.《建筑基坑支护技术规程》(JGJ120-99).北京:中国建筑工业出版社,1999.
[9]陈祖煜著.土质边坡稳定分析———原理、方法、程序[M].北京:水利电力出版社,2000.
[10]贺可强,王胜利,阳吉宝.运用遗传算法求解土钉支护结构的整体稳定性系数[J].岩土力学.2003,24(3):355-358.
[11]郑阿奇,丁有和,周怡君.Visual C++实用教程(第2版)[M].北京:电子工业出版社,2003.
[2]朱彦鹏,王秀丽,狄生奎,等.黄土边坡建筑的抗滑移设计[J].甘肃工业大学学报,2002,28(2):85-89.
[3]朱彦鹏,王秀丽,张贵文,等.兰州中广大厦超长深基坑支护的设计、施工与实验监测[J].工程力学(增刊),2003,336-341.
[4]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2004,2.
[5]李海深,杨果林,邹银生.加筋土挡土墙动力特性分析[J].中国公路学报,2004,17(2):28-32.
[6]董建华,朱彦鹏.地震作用下土钉支护高速公路边坡动力参数分析[J].西安建筑科技大学学报(自然科学版).2007,39(5):661-666.
[7]国家标准.《建筑边坡工程技术规范》(GB50330-2002).北京:中国建筑工业出版社,2002.
[8]国家标准.《建筑基坑支护技术规程》(JGJ120-99).北京:中国建筑工业出版社,1999.
[9]陈祖煜著.土质边坡稳定分析———原理、方法、程序[M].北京:水利电力出版社,2000.
[10]贺可强,王胜利,阳吉宝.运用遗传算法求解土钉支护结构的整体稳定性系数[J].岩土力学.2003,24(3):355-358.
[11]郑阿奇,丁有和,周怡君.Visual C++实用教程(第2版)[M].北京:电子工业出版社,2003.
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