地震作用下华丽高速公路金沙江桥华坪岸顺层边坡动力稳定性评价

doi:10.16285/j.rsm.2016.2235

›› 2018, Vol. 39 ›› Issue (S1): 387-394.doi: 10.16285/j.rsm.2016.2235

地震作用下华丽高速公路金沙江桥华坪岸顺层边坡动力稳定性评价

尹小涛^{1, 2}，严飞²，秦雨樵^{1, 3}，周磊^{1, 3}，王东英^{1, 3}

1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室，湖北武汉 430071； 2. 云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室，云南昆明 650041；3. 中国科学院大学，北京 100000

收稿日期:2016-09-20 出版日期:2018-07-20 发布日期:2018-09-02
作者简介:尹小涛，男，1975年生，博士，副研究员，主要从事岩土细观力学实验和数值模拟工作
基金资助:
云南省交通科技项目[云交科2014（A）01；云交科教(2016)140(A)]；国家自然科学基金(No. 51778609, No. 51608518, No.41202226,)。

Dynamic stability evaluation on Huaping bedding bank slope of Jinshajiang River Bridge in Huali Expressway under seismic action

YIN Xiao-tao^{1, 2}, YAN Fei², QIN Yu-qiao^{1, 2}, ZHOU Lei^{1, 3}, WANG Dong-ying^{1, 3}

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. National Engineering Laboratory for prevention and control of meteorological disasters in land traffic, Broadvision Engineering Consultants, Kunming, Yunnan 650041, China; 3 University of Chinese Academy of Sciences, Beijing 100000, China

Received:2016-09-20 Online:2018-07-20 Published:2018-09-02
Supported by:
This work was supported by the Traffic Science and Technology Project of Yunnan Province[2014（A）01, (2016)140(A)] and the Natural Science Foundation of China (51778609, 51608518, 41202226).

摘要/Abstract

摘要： 以华丽金沙江桥华坪岸顺层边坡地震稳定问题为研究对象，在slide下利用Janbu-simplified法计算了其最不利滑动面和安全系数，为模型试验确定了宽900 m×高450 m的试验范围。采用拟静力法，在Phase 2D下利用有限元强度折减法模拟模型边坡，计算了0.00g、0.10g、0.15g、0.20g、0.25g、0.30g、0.35g等7个地震工况的安全系数和位移。对比不同工况下的安全系数、位移与水平地震加速度曲线，结果表明，（1）极限平衡法与强度折减法所得安全系数在1.0附近安全系数离散性最小，远离1.0则安全系数的离散性增大，差异是两类方法极限状态定义的不同造成的。基于安全系数确定的临界水平地震加速度为0.20g；（2）剪应变揭示的边坡破坏模式为桥墩位置拉剪破坏、T2凝灰岩主滑和前缘近于水平剪出破坏，坡体内部的变形响应敏感性为水平位移＞竖向位移＞剪应变。基于变形演化规律确定的临界值为0.15g～0.20g，相应水平位移预警值为10.2 mm，室内模型试验验证了上述分析的合理性；（3）综合确定华坪岸顺层边坡临界水平地震加速度为0.2g，50年超越概率为10%和100年超越概率为2%对应的安全系数分别约为1.2和1.1，华坪岸边坡在现行抗震设防标准下是安全的。当前选择安全系数作为边坡稳定性评价指标，而安全监控实践中一般选择可操作性和预警性强的变形值作为控制指标，所以边坡稳定性评价需要采取安全系数与临界位移相结合的方法。

关键词: 顺层边坡, 安全系数, 临界位移, 临界水平地震加速度, 稳定性评价

Abstract: Seismic stability of Huaping bedding slope of Jinshajiang River bridge in Huali Expressway is studied. Safety factor, slip surface and scope of width 900 m and height 450 m are suggested by Janbu-simplified method based on slide. Safety factors and deformations of seven kinds of seismic working conditions such as horizontal acceleration being 0.00g, 0.10g, 0.15g, 0.20g, 0.25g, 0.30g and 0.35g are respectively computed by strength reduction method of finite elements on basis of Phase2D using quasi-static method, simulated object being model test. After curves of safety factor or defromation and horizontal acceleration of different seismic load conditions are compared with each other. The results show that: (1) Safety factor near to 1.0, the deviation is least, otherwise the deviation and discreteness increase, which is caused by disunity of limit condition defined by the two methods. Critical horizontal acceleration done by safety factor is 0.20g. (2) Fail mode presented by shear strain is bridge pier being tensile-shear fail, sliding in T2 tuff stratum and horizontally sheared out in front. Sensitivity order of deformation response in slope is horizontal displacement more sensitive than vertical displacement than shear strain. Limit value done by deformation evolution is 0.15g-0.20g, corresponding horizontal displacement being 10.2 mm. These are all proved by model test. (3) Finally, the critical horizontal acceleration of Huaping bedding slope comprehensively being 0.2g, safety factors of exceedance probability being 10% for 50 years and that of exceedance probability being 2% for 100 years are respectively 1.2 and 1.1. Huaping slope is safe under current seismic fortification criterion. In practice, safety factor considered material strength reserve is often selected as evaluating indicator of slope stability; but a strong operability and warning displacement considered deformation mechanism is selected for engineering safety monitoring. So, slope stability needed to be estimated by safety factor combined with critical displacement.

Key words: bedding slope, safety factor, critical displacement, critical horizontal earthquake acceleration, stability estimation

中图分类号:

TU 457

尹小涛，严飞，秦雨樵，周磊，王东英, . 地震作用下华丽高速公路金沙江桥华坪岸顺层边坡动力稳定性评价[J]. , 2018, 39(S1): 387-394.

YIN Xiao-tao, YAN Fei, QIN Yu-qiao, ZHOU Lei, WANG Dong-ying, . Dynamic stability evaluation on Huaping bedding bank slope of Jinshajiang River Bridge in Huali Expressway under seismic action[J]. , 2018, 39(S1): 387-394.

参考文献

相关文章 15

[1]	周强, 黎康平, 段亚辉, 曹子君, 李典庆, . 基于广义可靠指标相对安全率的地基承载力安全判据研究[J]. 岩土力学, 2020, 41(6): 2052-2062.
[2]	肖明清, 徐晨, . 基于临界稳定断面的隧道围岩稳定性分析方法探讨[J]. 岩土力学, 2020, 41(5): 1690-1698.
[3]	张海娜, 陈从新, 郑允, 孙朝燚, 张亚鹏, 刘秀敏, . 坡顶荷载作用下岩质边坡弯曲倾倒破坏分析[J]. 岩土力学, 2019, 40(8): 2938-2946.
[4]	陈峥, 何平, 颜杜民, 高红杰, 聂奥祥, . 超前支护下隧道掌子面稳定性极限上限分析[J]. 岩土力学, 2019, 40(6): 2154-2162.
[5]	吴关叶, 郑惠峰, 徐建荣. 三维复杂块体系统边坡深层加固条件下稳定性及破坏机制模型试验研究[J]. 岩土力学, 2019, 40(6): 2369-2378.
[6]	任晋岚, 陈曦, 王冬勇, 吕彦楠. 基于广义Hoek-Brown准则的瞬时线性化强度折减技术[J]. 岩土力学, 2019, 40(12): 4865-4872.
[7]	李典庆, 周强, 曹子君, . 基于广义可靠指标相对安全率的岩土工程设计安全判据[J]. 岩土力学, 2019, 40(10): 3977-3986.
[8]	尹小涛，薛海斌，汤华，任兴文，宋罡,. 边坡局部和整体稳定性评价方法的辩证统一[J]. , 2018, 39(S1): 98-104.
[9]	肖国峰，陈从新. 岩质块体渐进破坏的稳定分析方法[J]. , 2018, 39(8): 3001-3010.
[10]	许明，唐亚锋，刘先珊，罗斌，唐道勇，. 自适应锚索锚固岩质边坡地震动力响应分析[J]. , 2018, 39(7): 2379-2386.
[11]	李清川，李术才，王汉鹏，张红军，张冰，张玉强,. 上覆流沙层隧道开挖面稳定性分析与数值试验研究[J]. , 2018, 39(7): 2681-2690.
[12]	严敏嘉，夏元友，刘婷婷. 地震作用下预应力锚索加固顺层岩坡极限分析[J]. , 2018, 39(7): 2691-2698.
[13]	温树杰，梁超，宋亮亮，刘刚,. 基于最小势能法的三维临界滑裂面搜索方法[J]. , 2018, 39(7): 2708-2714.
[14]	张海涛，罗先启，沈辉，毕金锋. 基于矢量和的滑面应力抗滑稳定分析方法[J]. , 2018, 39(5): 1691-1698.
[15]	赵金帅，冯夏庭，江权，陈炳瑞，肖亚勋，胡磊，丰光亮，李鹏翔，. 分幅开挖方式下高应力硬岩地下洞室的微震特性及稳定性分析[J]. , 2018, 39(3): 1020-1026.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

地震作用下华丽高速公路金沙江桥华坪岸顺层边坡动力稳定性评价

Dynamic stability evaluation on Huaping bedding bank slope of Jinshajiang River Bridge in Huali Expressway under seismic action

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0