含软弱夹层缓倾顺层岩质边坡稳定敏感性分析
|
摘要
缓倾顺层岩质边坡中,软弱夹层的存在对边坡稳定性起到重要影响作用。为探讨软弱夹层相关参数对岩质边坡稳定性的影响,将数值模拟与数理统计方法有机结合,并以某高速公路段边坡为典型案例,基于强度折减法用MIDAS/GTS软件求出边坡安全系数,然后采用正交试验方法选取具有代表性的软弱夹层相关参数进行搭配—厚度、倾角、黏聚力、内摩擦角4个因素及每个因素下4个水平进行极差分析与单因素敏感性分析,研究4个因素对边坡稳定的影响性大小。结果表明:软弱夹层内摩擦、倾角、黏聚力、厚度对边坡稳定的影响性依次降低。在正常波动范围内,内摩擦越大对边坡稳定越有利;倾角越小越有利于边坡稳定;黏聚力越大越有利于边坡稳定;厚度适中时越有利于边坡稳定。在边坡治理上应按岩土体参数对边坡稳定的影响性先后顺序进行综合考虑,研究成果为此类工程的边坡治理提供有效参考依据。
The presence of a weak interlayer plays an important role in the stability of the gently inclined bedding rock slope. To investigate the influence of parameters of weak interlayer on rock slope stability, the numerical simulation and mathematical statistics methods are combined, and a slope section of a highway is taken as a typical case. The MIDAS/GTS software is used to find the edge based on the strength reduction method, then the safety factor of the slope is chosen by orthogonal test method to select the relevant parameters of the weak interlayer. The four factors of thickness, inclination, cohesion and internal friction angle and four levels under each factor are used to analyze the range and the single factor sensitivity analysis, and to study the influence of four factors on slope stability. The results show that the influence of internal friction, inclination, cohesion and thickness on the stability of the slope is reduced. In the normal fluctuation range, the greater the internal friction, the more favorable the slope stability; the smaller the inclination angle, the better the slope stability; the greater the cohesion, the better the slope stability; the moderate thickness is more favorable for the slope stability. In the slope treatment, comprehensive consideration should be given to the order of influence of rock and soil parameters on slope stability. The research results provide an effective reference for the slope treatment of such projects.
The presence of a weak interlayer plays an important role in the stability of the gently inclined bedding rock slope. To investigate the influence of parameters of weak interlayer on rock slope stability, the numerical simulation and mathematical statistics methods are combined, and a slope section of a highway is taken as a typical case. The MIDAS/GTS software is used to find the edge based on the strength reduction method, then the safety factor of the slope is chosen by orthogonal test method to select the relevant parameters of the weak interlayer. The four factors of thickness, inclination, cohesion and internal friction angle and four levels under each factor are used to analyze the range and the single factor sensitivity analysis, and to study the influence of four factors on slope stability. The results show that the influence of internal friction, inclination, cohesion and thickness on the stability of the slope is reduced. In the normal fluctuation range, the greater the internal friction, the more favorable the slope stability; the smaller the inclination angle, the better the slope stability; the greater the cohesion, the better the slope stability; the moderate thickness is more favorable for the slope stability. In the slope treatment, comprehensive consideration should be given to the order of influence of rock and soil parameters on slope stability. The research results provide an effective reference for the slope treatment of such projects.
引文
[1] 蒋青青, 胡毅夫, 赖伟明. 层状岩质边坡遍布节理模型的三维稳定性分析[J]. 岩土力学, 2009, 30(3):712-716
[2] 李萌,巨能攀,邓天鑫,等.强震作用下中倾外层状岩质边坡动力失稳机理研究[J].水利水电技术,2018,49(5):177-122
[3] 杨令强,练继建,陈祖平.软弱夹层的接触问题与强度问题探讨[J].水利水电技术,2002,33(6):17-19
[4] 刘小丽,周德培.有软弱夹层岩体边坡的稳定性评价[J].西南交通大学学报,2002,37(4):382-386
[5] 王建国,王振伟,王来贵,等.受控于软弱结构面的矿山软岩边坡稳定性[J].辽宁工程技术大学学报, 2006, 25(5):686-688
[6] 戴妙林,屈佳乐,刘晓青,等.基于GA-BP算法的岩质边坡稳定性和加固效应预测模型及其应用研究[J].水利水电技术,2018,49(5):165-171
[7] 郑力, 谢春燕, 李岩,等. 强度折减法在三种坡度下的植物护坡应用[J]. 水利水电技术, 2017,(12):138-145
[8] 吕博.含软弱夹层的岩质边坡稳定性研究[D].邯郸:河北工程大学,2013
[9] 宋鑫华.基于强度折减法的贵州红黏土边坡稳定性影响因素分析[J].人民珠江,2015, 36(4):5-7
[10] 宋鑫华.基于强度折减法的贵州红黏土边坡稳定敏感性探讨[J].人民珠江,2015, 36(2):37-39
[11] 张旭辉,龚晓南,徐日庆.边坡稳定影响因素敏感性的正交法计算分析[J].中国公路学报,2003,16(1):36-39
[12] 郭双枫,李宁,姚显春,等.层状岩质边坡稳定性影响因素及精度问题研究[J].地震工程学报, 2017, 39(2):362-368
[13] 倪恒,刘佑荣,龙治国.正交设计在滑坡敏感性分析中的应用[J].岩石力学与工程学报,2002,21(7):989-992
[14] Yang Y C, Xing H G, Yang X G, et al. Experimental study on the dynamic response and stability of bedding rock slopes with weak interlayers under heavy rainfall[J]. Environmental Earth Sciences, 2018, 77(12):433
[15] 郑颖人,赵尚毅.有限元强度折减法在土坡与岩坡中的应用[J]. 岩石力学与工程学报, 2004, 23(19):3381-3388
[16] 刘明维,郑颖人.基于有限元强度折减法确定滑坡多滑动面方法[J].岩石力学与工程学报, 2006, 25(8):1544-1549
[17] 陈国庆, 黄润秋, 石豫川,等. 基于动态和整体强度折减法的边坡稳定性分析[J]. 岩石力学与工程学报, 2014, 33(2):243-256
[18] 陈魁. 应用概率统计[M]. 北京:清华大学出版社, 2000
[2] 李萌,巨能攀,邓天鑫,等.强震作用下中倾外层状岩质边坡动力失稳机理研究[J].水利水电技术,2018,49(5):177-122
[3] 杨令强,练继建,陈祖平.软弱夹层的接触问题与强度问题探讨[J].水利水电技术,2002,33(6):17-19
[4] 刘小丽,周德培.有软弱夹层岩体边坡的稳定性评价[J].西南交通大学学报,2002,37(4):382-386
[5] 王建国,王振伟,王来贵,等.受控于软弱结构面的矿山软岩边坡稳定性[J].辽宁工程技术大学学报, 2006, 25(5):686-688
[6] 戴妙林,屈佳乐,刘晓青,等.基于GA-BP算法的岩质边坡稳定性和加固效应预测模型及其应用研究[J].水利水电技术,2018,49(5):165-171
[7] 郑力, 谢春燕, 李岩,等. 强度折减法在三种坡度下的植物护坡应用[J]. 水利水电技术, 2017,(12):138-145
[8] 吕博.含软弱夹层的岩质边坡稳定性研究[D].邯郸:河北工程大学,2013
[9] 宋鑫华.基于强度折减法的贵州红黏土边坡稳定性影响因素分析[J].人民珠江,2015, 36(4):5-7
[10] 宋鑫华.基于强度折减法的贵州红黏土边坡稳定敏感性探讨[J].人民珠江,2015, 36(2):37-39
[11] 张旭辉,龚晓南,徐日庆.边坡稳定影响因素敏感性的正交法计算分析[J].中国公路学报,2003,16(1):36-39
[12] 郭双枫,李宁,姚显春,等.层状岩质边坡稳定性影响因素及精度问题研究[J].地震工程学报, 2017, 39(2):362-368
[13] 倪恒,刘佑荣,龙治国.正交设计在滑坡敏感性分析中的应用[J].岩石力学与工程学报,2002,21(7):989-992
[14] Yang Y C, Xing H G, Yang X G, et al. Experimental study on the dynamic response and stability of bedding rock slopes with weak interlayers under heavy rainfall[J]. Environmental Earth Sciences, 2018, 77(12):433
[15] 郑颖人,赵尚毅.有限元强度折减法在土坡与岩坡中的应用[J]. 岩石力学与工程学报, 2004, 23(19):3381-3388
[16] 刘明维,郑颖人.基于有限元强度折减法确定滑坡多滑动面方法[J].岩石力学与工程学报, 2006, 25(8):1544-1549
[17] 陈国庆, 黄润秋, 石豫川,等. 基于动态和整体强度折减法的边坡稳定性分析[J]. 岩石力学与工程学报, 2014, 33(2):243-256
[18] 陈魁. 应用概率统计[M]. 北京:清华大学出版社, 2000