3D NUMERICAL SIMULATION OF SLOPE STABILITY OF LANCANGJIANG BRIDGE ON DALI-RUILI RAILWAY
-
摘要: 采用现场调查、工程地质分析和三维数值模拟方法，对在建大瑞铁路工程澜沧江大桥边坡稳定性进行了综合分析研究。澜沧江大桥是在建大瑞铁路的控制性工程之一，由于多种因素的综合作用，桥址岸坡发育延伸较长的顺坡向节理和近垂直的陡倾节理。右岸桥位工程开挖区位于一组较大型顺坡结构面的下方，岸坡稳定性直接关系到桥位的适宜性。综合研究表明，工程开挖后，右岸桥位上部岩体极易在顺坡向结构面的控制下发生滑移–拉裂式破坏，沿外倾结构面产生较大的位移，甚至可能失稳，需要进行专门的工程治理。左岸边坡岩体结构相对稳定，工程开挖后，位移将主要集中在开挖面附近的浅表层部位，不仅变形较小，影响范围也相对较小。Abstract: The Lancangjiang Bridge is one of the controlled engineerings on the under-construction Dali-Ruili Railway. Along the bank slopes at which the bridge site is located there are greatly developed long-extending dip-slope joints and nearly vertical joints, The excavation area of the bridge site on right bank is below a group of large dip-slope structural planes, so the slope stability is directly related to the suitability of bridge site. Comprehensive studies show that excavation on right bank will be like to induce slip and tension crack failure affected by the dip-slope structural planes and to cause great displacement along extraversion structural planes, and even instability on whole slope, with which the specialized engineering management should be taken to deal. On the contrary, rock masses on left bank are of a relatively stable structure, and the displacement induced by engineering will mainly take place on shallow surface of excavation site, with slight deformation and limited influence area.
-
图 2 澜沧江大桥设计纵断面示意图
Figure 2. Sketch map showing the vertical section of Lancangjiang Bridge
图 3 右岸结构面极点密度等值线
Figure 3. Contours of summit density of structural plane on right bank
图 4 澜沧江右岸工程边坡特征
Figure 4. Characteristics of engineering slope on the right bank of the Lancang River
图 5 两岸工程边坡及桥体结构FLAC3D数值计算模型
Figure 5. FLAC 3D digital model for engineering slopes on both banks of the Lancang River and bridge body structure
图 6 隧洞口边坡开挖最大主应力特征
Figure 6. Characteristics of maximum excavation principal stress of side slopes in tunnel exit
图 7 隧洞口边坡开挖最小主应力特征
Figure 7. Characteristics of minimum excavation principal stress of side slopes in tunnel exit
图 8 两岸工程区开挖后的塑性区分布图
Figure 8. Distribution of ductility area after engineering excavation on both banks of the Lancang River
图 9 开挖边坡沿线路剖面位移矢量图
Figure 9. Displacement vectogram along profiles on excavation slopes
表 1 工程边坡FLAC3D模型的计算参数
Table 1. Calculation parameters of FLAC 3D model for the engineering slopes
-
[1] 张永双, 张加桂, 雷伟志, 等.中国西南泛亚大通道环境工程地质问题概论[J].地学前缘, 2007, 14 (6) :24 ~ 30. http://d.old.wanfangdata.com.cn/Periodical/dxqy200706004ZHANG Yong-shuang, ZHANG Jia-gui, LEI Wei-zhi, et al. Discussion on the environmental geological problems in the adjacent area from southwest China to southeast Asia[J]. Earth Science Frontiers, 2007, 14 (6) : 24 ~ 30. http://d.old.wanfangdata.com.cn/Periodical/dxqy200706004 [2] 唐伟华, 陈明浩.大瑞铁路澜沧江大桥桥址工程地质比选研究[J].铁道工程学报, 2008, (4) : 8 ~ 11. http://d.old.wanfangdata.com.cn/Periodical/tdgcxb200804003TANG Wei-hua, CHEN Ming-hao. Comparative study on engineering geology for site selection of Lancang River Bridge on Dali-Ruili railway[J]. Journal of Railway Engineering Society, 2008, (4) : 8 ~ 11. http://d.old.wanfangdata.com.cn/Periodical/tdgcxb200804003 [3] 黄润秋.中国西南岩石高边坡的主要特征及其演化[J].地球科学进展, 2005, 20 (3) : 292 ~ 297. http://d.old.wanfangdata.com.cn/Periodical/dqkxjz200503005HUANG Run-qiu. Main characteristics of high rock slopes in southwestern China and their dynamic evolution[J]. Advances in Earth Science, 2005, 20 (3) : 292 ~ 297. http://d.old.wanfangdata.com.cn/Periodical/dqkxjz200503005 [4] 张倬元, 王士天, 王兰生.工程地质分析原理[M].北京:地质出版社, 1994.ZHANG Zhuo-yuan, WANG Shi-tian, WANG Lan-sheng. Analytical principle of engineering geology[M ]. Beijing: Geological Publishing House, 1994. [5] 郑光, 许强. JRC-JCS模型在某边坡抗剪强度取值中的应用[J].山西建筑, 2008, 34 (6) : 15 ~ 17. http://d.old.wanfangdata.com.cn/Periodical/shanxjz200806009ZHENG Guang, XU Qiang. The application of JRC-JCS model in the value of one slope shearing strength[J]. Shanxi Architecture, 2008, 34 (6) : 15 ~ 17. http://d.old.wanfangdata.com.cn/Periodical/shanxjz200806009 [6] 王来贵, 黄润秋, 张倬元, 等.岩石力学系统运动稳定性问题及其研究现状[J].地球科学进展, 1997, 12 (3) : 236 ~ 241. http://www.adearth.ac.cn/CN/abstract/abstract3281.shtmlWANG Lai-gui, HUANG Run-qiu, ZHANG Zhuo-yuan, et al. The stability problem of rock machanics system and its study of present situation[J]. Advence in Earth Sciences, 1997, 12 (3) : 236 ~ 241. http://www.adearth.ac.cn/CN/abstract/abstract3281.shtml [7] 郭长宝, 雷伟志, 张永双, 等.滇藏铁路滇西北段主要地质灾害类型及发育规律的探讨[J].地质力学学报, 2006, 12 (2) : 228 ~ 235. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20060233&journal_id=dzlxxbGUO Chang-bao, LEI Wei-zhi, ZHANG Yong-shuang, et al. Main geoharzard types and their occurrence characteristics along the YunNan-Tibet railway in NE YunNan[J]. Journal of Geomechanics, 2006, 12 (2) : 228 ~ 235. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20060233&journal_id=dzlxxb [8] 张永双, 王红才.砂黄土高边坡稳定性的数值模拟研究[J].地质力学学报, 2004, 10 (4) : 357 ~ 365. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20040446&journal_id=dzlxxbZHANG Yong-shuang, WANG Hong-cai. Numerical simulation of the stability of high sand loess slopes[J]. Journal of Geomechanics, 2004, 10 (4) : 357 ~ 365. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20040446&journal_id=dzlxxb [9] 张思峰, 周健, 宋修广, 等.预应力锚索锚固效应的三维数值模拟及其工程应用研究[J].地质力学学报, 2006, 12 (2) : 166 ~ 173. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20060225&journal_id=dzlxxbZHANG Si-feng, ZHOU Jian, SONG Xiu-guang, et al. 3D Numerical simulation of the anchor effect of prestressed cables and its engineering application[J]. Journal of Geomechanics, 2006, 12 (2) : 166 ~ 173. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20060225&journal_id=dzlxxb [10] 卢书强. 澜沧江糯扎渡水电站开挖边坡稳定性工程地质系统研究[D]. 成都: 成都理工大学, 2007.LU Shu-qiang. Systematical Study on Engineering Geology of the Excavation Slopes Stability of Nuozadu Hydro-power Station in Lancang River[D]. Chengdu: Chengdu University of Technology, 2007. -
下载:
计量
- 文章访问数: 210
- HTML全文浏览量: 95
- PDF下载量: 4
- 被引次数: 0
