基于非确定性分析法的顺层边坡抗震性研究
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摘要
顺层岩质边坡的抗震性指标大部分都是非确定的,无法用固定阈值衡量。提出基于非确定性分析法的顺层边坡抗震性性能研究,将顺层岩质边坡看作若干个叠加的薄板;运用非确定性分析法计算各个薄板的动力安全系数和动力极限状态方程,并对顺层边坡动力极限状态方程进行求解,可得在地震作用力下顺层边坡动力可靠度指标与顺层边坡失效概率之间的关系;评估地震作用力下顺层边坡整体稳定性,同时综合考量顺岩边坡的最小平均安全系数以及平均失效概率,得出评估结果。实验结果显示,在地震作用力下,顺层边坡坡高、坡角、岩层倾角对顺岩边坡抗震性能影响显著,评估结果与实际结果一致。
Seismic indexes of bedding rock slopes are mostly uncertain and cannot be measured by a fixed threshold. An uncertain analysis-based method of measuring the seismic behavior of bedding rock slopes is proposed. The bedding rock slope is regarded as several superimposed thin plates. The dynamic safety factor and the dynamic limit state equation of each thin plate are calculated by an uncertain analysis method, and the dynamic limit of bedding rock slope is calculated. The relationship between the dynamic reliability index and failure probability of the bedding slope under earthquake can be obtained by solving the dynamic limit state equation, and the overall stability of the bedding slope can be evaluated under seismic force. The minimum average safety factor and average failure probability of the bedding slope can be comprehensively considered, and the evaluation results can be obtained. The experimental results show that the height, angle, and dip angle of the bedding slope have a significant influence on the seismic performance of the bedding slope under seismic force, and the evaluation results are consistent with the actual results.
Seismic indexes of bedding rock slopes are mostly uncertain and cannot be measured by a fixed threshold. An uncertain analysis-based method of measuring the seismic behavior of bedding rock slopes is proposed. The bedding rock slope is regarded as several superimposed thin plates. The dynamic safety factor and the dynamic limit state equation of each thin plate are calculated by an uncertain analysis method, and the dynamic limit of bedding rock slope is calculated. The relationship between the dynamic reliability index and failure probability of the bedding slope under earthquake can be obtained by solving the dynamic limit state equation, and the overall stability of the bedding slope can be evaluated under seismic force. The minimum average safety factor and average failure probability of the bedding slope can be comprehensively considered, and the evaluation results can be obtained. The experimental results show that the height, angle, and dip angle of the bedding slope have a significant influence on the seismic performance of the bedding slope under seismic force, and the evaluation results are consistent with the actual results.
引文
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[2] 冉涛,赵安平,尹剑辉.地震作用下顺层岩质滑坡稳定性离散元模拟[J].长江科学院院报,2016,33(3):115-121.RAN Tao,ZHAO Anping,YIN Jianhui.Discrete Element Simulation of Stability of Bedding Rocky Landslide Under Earthquake Action[J].ournal of Yangtze River Scientific Research Institute,2016,33(3):115-121.
[3] 陈训龙,龚文惠,钟旭晗,等.水平和竖向地震作用下顺层岩质边坡动力可靠性分析[J].土木工程学报,2017(10):95-102.CHEN Xunlong,GONG Wenhui,ZHONG Xuhan,et al.Dynamic Reliability Analysis of Bedding Rock Slopes under Horizontal and Vertical Earthquake Actions[J].China Civil Engineering Journal,2017(10):95-102.
[4] 范刚,张建经,付晓.含软弱夹层顺层岩质边坡传递函数及其应用研究[J].岩土力学,2017,38(4):1052-1059.FAN Gang,ZHANG Jianjing,FU Xiao.Research on Transfer Function of Bedding Rock Slope with Soft Interlayers and Its Application[J].Rock and Soil Mechanics,2017,38(4):1052-1059.
[5] 陈瑞青,张存巍.循环荷载作用下土质边坡动力响应分析[J].科学技术与工程,2016(3):112-117.CHEN Ruiqing,ZHANG Cunwei.Analysis of Soil Slope Dynamic Response under Cyclic Loads[J].Science Technology and Engineering ,2016(3):112-117.
[6] 廖丽萍,朱颖彦,杨志全,等.中巴喀喇昆仑公路顺层岩质边坡受力分析[J].地下空间与工程学报,2016,12(1):243-249.LIAO Liping,ZHU Yingyan,YANG Zhiquan,et al.Analysis on Rock Bedded Slope of Karakoram Highway,Pakistan[J].Chinese Journal of Underground Space and Engineering,2016,12(1):243-249.
[7] 钟庭,陈辉国,刘国粹,等.地震波双模态时变修正Kanai-Tajimi非平稳随机模型的改进及参数识别[J].地震工程学报,2017,39(1):72-79.ZHONG Ting,CHEN Huiguo,LIU Guocui,et al.Improvement and Parameter Identification of Bimodal Time Variables Modified by the Kanai-Tajimi Nonstationary Stochastic Model Using Strong Ground Motion Records[J].China Earthquake Engineering Journal,2017,39(1):72-79.
[8] 毛文涛,冯君,杨涛,等.考虑地震力与静水压力的顺层岩质边坡弯曲破坏分析[J].防灾减灾工程学报,2017,37(5):71-76.MAO Wentao,FENG Jun,YANG Tao,et al.Analysis of Flexural Failure of Consequent Rock Slope Considering Seismic Force and Hydrostatic Pressure[J].防灾减灾工程学报,2017,37(5):71-76.
[9] 梁庆国,王丽丽,孙文,等.二元结构顺层边坡抗滑桩抗震性能研究[J].地震工程与工程振动,2014,01(6):248-255.LIANG Qingguo,WANG Lili,SUN Wen,et al.Seismic Behavior of Anti-slide Piles with Double-layered Bedding Slope[J].Earthquake Engineering and Engineering Dynamics,2014,01(6):248-255.
[10] 江婷,沈振中,聂柏松,等.基于离散元法的顺层岩质边坡的地震响应分析[J].南水北调与水利科技,2017,15(4):136-141.JIANG Ting,SHEN Zhenzhong,NIEBaisong,et al.Analysis of Seismic Responses of Bedding Rock Slope Based on DEM[J].South-to-North Water Transfers and Water Science & Technology,2017,15(4):136-141.