Failure mechanisms of embankment on inclined soft foundation reinforced by CFG Piles
-
摘要: 通过4组土工离心模型试验,研究了山区底面倾斜的软土层CFG桩复合地基路堤破坏模式。试验模拟了4种地基：倾斜天然软基,水平CFG桩复合地基,倾斜CFG桩复合地基,以及施工有缺陷的CFG桩复合地基。试验结果表明：①路堤荷载作用下,CFG桩易发生多次桩体断裂,最终形成能够随软土移动的刚性短桩;②底面倾斜的复合地基上,CFG桩的断裂更集中在下坡方向,路堤破坏的影响范围远大于水平地基的情况;③缺陷CFG桩复合地基路堤变形显著增大。Abstract: Four groups of centrifugal model tests are performed to investigate the failure mechanisms of embankment on inclined soft foundation reinforced by CFG piles. The tests simulate four kinds of grounds: natural inclined soft ground, normal CFG composite ground, inclined CFG composite ground, and inclined defect CFG composite ground. The results show that the failure mechanisms are as follows: (1) CFG piles are prone to fracture into many rigid short piles moving with soil failure; (2) For the inclined ground, fractures of CFG piles occur more greatly along the downhill direction, and the deformation is larger; (3) For the defect CFG pile composite ground, the deformation is significantly larger.
-
Keywords:
- CFG pile /
- composite ground /
- centrifugal model test /
- failure mode
-
[1] 魏永幸, 罗 强, 邱延峻. 斜坡软弱地基填方工程技术研究与探讨[M]. 北京: 人民交通出版社, 2011. (WEI Yong-xing, LUO Qiang, QIU Yan-jun. Research and discussion on filling engineering techniques on sloped soft soil foundation[M]. Beijing: China Communications Press, 2011. (in Chinese)) [2] 魏永幸. 基于填方工程的斜坡软弱地基及其成因[J].地质灾害与环境保护, 2006, 17(1): 56-63. (WEI Yong-xing. Embankment-based sloped soft soil foundation and its cause of formation[J]. Journal of Geological Hazards and Environment Preservation, 2006, 17(1): 56-63. (in Chinese)) [3] 黄炜旺. 山区复合地基路堤离心模型试验研究 [D]. 广州: 广州大学, 2015. (HUANG Wei-wang. Research on embankment stability on montanic composite foundation by centrifugal model tests[D]. Guangzhou: Guangzhou University, 2015. (in Chinese)) [4] 朱维新. 土工离心模型试验研究状况[J]. 岩土工程学报, 1986, 8(2): 82-90. (ZHU Wei-xin. State of geotechnical centrifuge modeling test[J]. Chinese Journal of Geotechnical Engineering, 1986, 8(2): 82-90. (in Chinese)) [5] 南京水利科学研究院土工研究所. 土工试验技术手册[M]. 北京: 人民交通出版社, 2003. (Geotechnical Engineering Department, Nanjing Hydraulic Research Institute. Technical manual of geotechnical test[M]. Beijing: China Communication Press, 2003. (in Chinese)) [6] CECS54:93 袖珍贯入仪试验规程[S]. 1993. (CECS54:93 Pocket penetrometer test procedures[S]. 1993. (in Chinese)) [7] 章为民, 徐光明. 土石坝填筑过程的离心模拟方法[J]. 水利学报, 1997(2): 10-13. (ZHANG Wei-min, XU Guang-ming. Simulation method of rarth and rockfill dam filling process with centrifuge[J]. Journal of Hydraulic Engineering, 1997(2): 10-13. (in Chinese))
计量
- 文章访问数: 296
- HTML全文浏览量: 8
- PDF下载量: 257
下载:
