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Process control of slope-foundation instability based on strain evaluation
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摘要: 传统的边坡监测手段主要是监测局部区域的水平位移, 然而应力和应变指标可更直观体现边坡的实时状态。根据光纤传感分布式监测技术的原理, 建立了边坡-地基数值模型, 采用水平应变的评价指标, 对其变形失稳过程开展了研究。结果表明:在加载过程中, 相对于水平位移指标, 边坡内部的水平应变指标可以更好地体现边坡的变形失稳过程并能够预测实际破坏的滑动面。坡体内部设置的6条水平测线中最大水平应变与稳定性系数呈较好的对数关系, 通过比较, 建议主要对坡中区域进行布线监控。此外, 引入水平应变加速度指标, 得到了与边坡稳定性系数的关系, 并可预测边坡-地基的稳定性劣化趋势, 进而实现过程控制。Abstract: The traditional slope monitoring method is mainly used to monitor the horizontal displacement of the local area, however, the stress and strain index can reflect the real state of the slope more visually.Based on the principles of distributed fiber optic strain sensing monitoring technology, a numerical slope-foundation model was developed, and by using the horizontal strain index, studies of the deformation and the failure process of the model were carried out.The analysis results show that the horizontal strain index can reflect the deformation process of the slope and it can predict the actual slip surface better in the loading process, comparing with the horizontal displacement index.And there is a good logarithmic fit between the maximum horizontal strain and the stability factor in the 6 horizontal measuring lines distributed in the slope.It is suggested that the best monitoring area is the middle of the slope by comparison.In addition, by introducing the horizontal strain acceleration index (HSA), the relationships between the slope stability coefficient and HSA were captured to predict the stability degradation trend of the slope-foundation, after which the process control could be realized.
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Key words:
- slope-foundation /
- strain /
- finite element method /
- stability coefficient /
- deformation
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图 2 坡体不同高程处的水平应变分布
Figure 2. Horizontal strain distribution at different elevations of slope
图 6 边坡稳定性与各测线最大水平应变的相关关系
Figure 6. Relationships between slope stability and maximum horizontal strain of each measuring line
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[1] 郑颖人, 陈祖煜, 王恭先, 等.边坡与滑坡工程治理[M].北京:人民交通出版社, 2007:1- 28. ZHENG Yinren, CHEN Zuyu, WANG Gongxian, et al.Slope and landslide engineering management[M].Beijing:China Communication Press, 2007:1- 28.(in Chinese) [2] 钱家欢, 殷宗泽.土工原理与计算[M].2版.北京:中国水利水电出版社, 1996. QIAN Jiahuan, YIN Zongze.Principles and calculations of geotechnical engineering[M].2nd ed.Beijing:China Water Power Press, 1996.(in Chinese) [3] 贺可强, 陈为公, 张朋.蠕滑型边坡动态稳定性系数实时监测及其位移预警判据研究[J].岩石力学与工程学报, 2016, 35(7):1377- 1385. https://www.wenkuxiazai.com/doc/d17dd8688762caaedc33d4e1.html HE Keqiang, CHEN Weigong, ZHANG Peng.Real-time monitoring of dynamic stability coefficient and displacement criterion of the creep slope[J].Chinese Journal of Rock Mechanics and Engineering, 2016, 35(7):1377- 1385.(in Chinese) https://www.wenkuxiazai.com/doc/d17dd8688762caaedc33d4e1.html [4] 孟永东, 徐卫亚, 刘造保, 等.复杂岩质高边坡工程安全监测三维可视化分析[J].岩石力学与工程学报, 2010, 29(12):2500- 2509. https://www.wenkuxiazai.com/doc/14d734e8cfc789eb162dc89f-3.html MENG Yongdong, XU Weiya, LIU Zaobao, et al.Analysis of 3D visualization of safety monitoring for complicated high rock slope engineering[J].Chinese Journal of Rock Mechanics and Engineering, 2010, 29(12):2500- 2509.(in Chinese) https://www.wenkuxiazai.com/doc/14d734e8cfc789eb162dc89f-3.html [5] 殷建华, 丁晓利, 杨育文, 等.常规仪器与全球定位仪相结合的全自动化遥控边坡监测系统[J].岩石力学与工程学报, 2004, 23(3):357- 364. https://www.wenkuxiazai.com/doc/ec28b00a79563c1ec5da7196-3.html YIN Jianhua, DING Xiaoli, YANG Yuwen, et al.Integration of conventional instruments and gps for remote automatic monitoring of slopes[J].Chinese Journal of Rock Mechanics and Engineering, 2004, 23(3):357- 364.(in Chinese) https://www.wenkuxiazai.com/doc/ec28b00a79563c1ec5da7196-3.html [6] 隋海波, 施斌, 张丹, 等.边坡工程分布式光纤监测技术研究[J].岩石力学与工程学报, 2008, 27(增刊2):3725- 3731. https://www.wenkuxiazai.com/doc/488dc11d7cd184254b3535a8.html SUI Haibo, SHI Bin, ZHANG Dan, et al.Study on distributed optical fiber sensor-based monitoring for slope engineering[J].Chinese Journal of Rock Mechanics and Engineering, 2008, 27(Suppl2):3725- 3731.(in Chinese) https://www.wenkuxiazai.com/doc/488dc11d7cd184254b3535a8.html [7] 丁勇, 施斌, 崔何亮, 等.光纤传感网络在边坡稳定监测中的应用研究[J].岩土工程学报, 2005, 27(3):338- 342. https://www.wenkuxiazai.com/doc/2ec8ee84cc22bcd126ff0c28-2.html DING Yong, SHI Bin, CUI Heliang, et al.A fiber optic sensing net applied in slope monitoring based on Brillouin scattering[J].Chinese Journal of Geotechnical Engineering, 2005, 27(3):338- 342.(in Chinese) https://www.wenkuxiazai.com/doc/2ec8ee84cc22bcd126ff0c28-2.html [8] ZHU H H, WANG Z Y, SHI B, et al.Feasibility study of strain based stability evaluation of locally loaded slopes:Insights from physical and numerical modeling[J].Engineering Geology, 2016, 208:39- 50. doi: 10.1016/j.enggeo.2016.04.019 [9] 何思明, 张晓曦, 罗渝.坡顶条形荷载作用边坡潜在滑裂面与稳定性分析[J].山地学报, 2011, 29(1):95- 100. http://www.cqvip.com/QK/96971A/201502/664259147.html HE Siming, ZHANG Xiaoxi, LUO Yu.Potential sling surface position and slope stability analysis under the strip load[J].Jounal of Mountain Science, 2011, 29(1):95- 100.(in Chinese) http://www.cqvip.com/QK/96971A/201502/664259147.html [10] LESHCHINSKY B, XIE Y.Bearing capacity for spread footings placed near c'-φ' slopes[J].Journal of Geotechnical & Geoenviremental Engineering, 2016, 143(1):06016020. http://www.academia.edu/3200419/The_Astronomical_Context_of_the_Archaeology_and_Architecture_of_the_Chacoan_Culture [11] SARAN S, SUD V K, HANDS S C.Bearing capacity of footings adjacent to slopes[J].Journal of Geotechnical Engineering, ASCE, 1989, 115(4):553- 573. doi: 10.1061/(ASCE)0733-9410(1989)115:4(553) [12] 邓楚键, 唐晓松, 郑颖人, 等.载荷试验有限元数值模拟[J].岩土力学, 2007, 28(增刊1):249- 253. doi: 10.3969/j.issn.1671-7627.2011.05.015 DENG Chujian, TANG Xiaosong, ZHENG Yinren, et al.Numerical analysis of the plate loading test[J].Rock and Soil Mechanics, 2007, 28(Suppl1):249- 253.(in Chinese) doi: 10.3969/j.issn.1671-7627.2011.05.015 [13] 邓楚键, 孔位学, 郑颖人.极限分析有限元法讲座Ⅲ-增量加载有限元法求解地基极限承载力[J].岩土力学, 2005, 26(3):500- 504. http://www.cnki.com.cn/Article/CJFDTotal-KXJS201431056.htm DENG Chujian, KONG Weixue, ZHENG Yinren.Analysis of ultimate bearing capacity of foundations by elastoplastic FEM through step loading[J].Rock and Soil Mechanics, 2005, 26(3):500- 504.(in Chinese) http://www.cnki.com.cn/Article/CJFDTotal-KXJS201431056.htm [14] 赵杰, 邵龙潭.有限元稳定分析法在确定土体结构极限承载力中的应用[J].水利学报, 2006, 37(6):668- 673. http://www.cnki.com.cn/Article/CJFDTotal-ZGTK200101014.htm ZHAO Jie, SHAO Longtan.Application of finite element analysis in determining the ultimate bearing capacity of soil mass[J].Journal of Hydraulic Engineering, 2006, 37(6):668- 673.(in Chinese) http://www.cnki.com.cn/Article/CJFDTotal-ZGTK200101014.htm -
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