FINITE ELEMENT PHASE ANALYSIS OF KARST-ROOF STABILITY UNDER PILE FOUNDATION

ZHANG Junmeng; FANG Congqi; ZHU Junfeng

Volume 22 Issue 1

Feb. 2014

Turn off MathJax

Article Contents

Article Navigation > JOURNAL OF ENGINEERING GEOLOGY > 2014 > 22(1): 78-85

ZHANG Junmeng, FANG Congqi, ZHU Junfeng. 2014: FINITE ELEMENT PHASE ANALYSIS OF KARST-ROOF STABILITY UNDER PILE FOUNDATION. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 78-85.

Citation:

ZHANG Junmeng, FANG Congqi, ZHU Junfeng. 2014: FINITE ELEMENT PHASE ANALYSIS OF KARST-ROOF STABILITY UNDER PILE FOUNDATION. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 78-85.

ZHANG Junmeng, FANG Congqi, ZHU Junfeng. 2014: FINITE ELEMENT PHASE ANALYSIS OF KARST-ROOF STABILITY UNDER PILE FOUNDATION. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 78-85.

Citation:

ZHANG Junmeng, FANG Congqi, ZHU Junfeng. 2014: FINITE ELEMENT PHASE ANALYSIS OF KARST-ROOF STABILITY UNDER PILE FOUNDATION. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 78-85.

PDF( 4863 KB)

FINITE ELEMENT PHASE ANALYSIS OF KARST-ROOF STABILITY UNDER PILE FOUNDATION

School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240

Funds:

Received Date: 2013-01-10
Rev Recd Date: 2013-08-30
Publish Date: 2014-02-25

Abstract

Abstract

This paper studies the stability and failure mode of cave-roof under pile foundation. It uses the finite element software DIANA's phase analysis to simulate the plastic deformation and displacement field characteristics of foundation soil in the process of karst cave expanding gradually. Also it sets up five different load levels in contrast. It takes the ultimate bearing capacity with no cave as a benchmark to analyze the coupled effects of cave development and load level on the stability of surrounding rock and summarizes cave failure mode and mechanism. The following conclusions are draw: cave development and pile load both exist critical safe value. When the load is small, cave plays a role of main influence to foundation. The development of cave unceasingly makes plastic strain expanding downward along pile. When load level is higher, the plastic strain of same cave developmental stage increases significantly, even within the safe cave development can lead to ahead of security phase and early damage. Finally this paper simulates practice mechanical characteristics of surrounding rock better as karst growing with time in the evolution process, which has important reference value for stability study of karst-roof.
- Karst,
- Phase,
- Load level,
- Plastic strain

FullText(HTML)

References(1)

References

[1] 工程地质手册编写委员会. 工程地质手册(第三版)[M].北京:中国建筑工业出版社, 1992. The Compilation Committee of Engineering Geology. Engineering Geology Handbook(Third edition).Beijing: China Architecture and Building Press, 1992.

[2] 刘佑荣, 唐辉明.岩体力学[M].武汉:中国地质大学出版社, 1999. Liu Yourong, Tang Huiming. Rock Mechanics. Wuhan: China University of Ceosciences Press, 1999.

[3] 赵明华, 曹文贵,何鹏祥,等. 岩溶及采空区桥梁桩基桩端岩层安全厚度研究[J].岩土力学, 2004, 25 (1): 64～68. Zhao Minghua, Cao Wengui, He Pengxiang, et al. Study on safe thickness of rock mass at end of bridge foundation's pile in karst and worked-out mine area. Rock and Soil Mechanics, 2004, 25 (1): 64～68.

[4] 刘之葵, 梁金城,朱寿增,等.岩溶区含溶洞岩石地基稳定性分析[J].岩土工程学报, 2003, 25 (5): 629～633. Liu Zhikui, Liang Jincheng, Zhu Shouzeng, et al. Stability analysis of rock foundation with cave in karst area. Chinese Journal of Geotechnical, 2003, 25 (5): 629～633.

[5] 赵明华, 蒋冲,曹文贵.岩溶区嵌岩桩承载力及其下伏溶洞顶板安全厚度的研究[J].岩土工程学报, 2007, 29 (11): 1618～1622. Zhao Minghua, Jiang Chong, Cao Wengui. Study on bearing capacity of rock-socked piles and safe thickness of cave roofs in karst region. Chinese Journal of Geotechnical Engineering, 2007, 29 (11): 1618～1622.

[6] 赵明华, 程晔,曹文贵.桥梁基桩桩端溶洞顶板稳定性的模糊分析研究[J].岩石力学与工程学报, 2005, 24 (8): 1376～1383. Zhao Minghua, Cheng Ye, Cao Wengui. Fuzzy method for the stability analysis of cave roof under pile tip in karst region. Chinese Journal of Rock Mechanics and Engineering, 2005, 24 (8): 1376～1383.

[7] 胡庆国, 张可能,阳军生.溶洞上方条形基础地基极限承载力有限元分析[J].中南大学学报(自然科学版), 2005, 36 (4): 694～697. Hu Qingguo, Zhang Keneng, Yang Junsheng. Finite element analysis of ultimate bearing capacity of strip footing above karst cave. Journal of Central South University(Science and Technology), 2005, 36 (4): 694～697.

[8] 阳军生, 张军,张起森等. 溶洞上方圆形基础地基极限承载力有限元分析[J].岩石力学与工程学报, 2005, 24 (2): 296～301. Yang Junsheng, Zhang Jun, Zhang Qisen et al. Finite element analysis of ultimate bearing capacity of circular founting above karst cave. Chinese Journal of Rock Mechanics and Engineering, 2005, 24 (2): 296～301.

[9] Baus R L,Wang M C.Bearing capacity of strip footing above void[J]. Journal of Geotechnical Engineering,1983, 109 (1): 1～14.

[10] Wang M C,Badie A.Effect of under ground void on foundation stability[J]. Journal of Geotechnical Engineering, 1985, 111 (8): 1008～1019.

[11] Badie A,Wang M C.Stability of spread footing above void in clay[J]. Journal of Geotechnical Engineering, 1984, 110 (11):1591～1605.

[12] Hsieh C W,Wang M C.Bearing capacity determination method for strip surface footings underlain by voids[J]. Transportation Research Record, 1996, 1336:90～95.

[13] Azam G,Wang M C.Performance of strip footing above voids in clay[J]. Journal of Geotechnical Engineering, 1990, 110 (3): 37～58.

[14] 黎斌, 范秋雁,秦风荣. 岩溶地区溶洞顶板稳定性分析[J].岩石力学与工程学报, 2002, 21 (4): 532～536. Li Bin, Fan Qiuyan, Qin Fengrong. Analysis on roof stability of karst cave in karst areas. Chinese Journal of Rock Mechanics and Engineering, 2002, 21 (4): 532～536.

[15] 刘辉, 杨峰,阳军生.空洞上方浅基础地基破坏模式与极限承载力分析[J].岩土力学, 2010, 31 (11): 3373～3378. Liu Hui, Yang Feng, Yang Junsheng. Failure mechanism and ultimate bearing capacity of strip footing above void. Rock and Soil Mechanics, 2010, 31 (11): 3373～3378.

[16] Diana Finite Element Analysis User's Manual(Release 8.1)[M].Department of Computational Mehanie's. TNO Building and Construction Research Delft, the Netherlads, 2002.

[17] Diana Finite Element Analysis User's Manual: Pre and Post-processing.

[18] Diana Finite Element Analysis User's Manual:Element Library.

[19] Diana Finite Element Analysis User's Manual: Getting Started.

[20] Diana Finite Element Analysis User's Manual: Analysis Example.

[21] 彭芳乐,清住真,高伟,等.空洞的存在对浅基础承载力与沉降影响分析[J].岩石力学与工程学报, 2007, 26 (6): 1123～1131. Peng Fangle, Kiyosumi Makoto, Gao Wei, et al. Study on bearing capacity and settlement of shallow foundation with void. Chinese Journal of Rock Mechanics and Engineering, 2007, 26 (6): 1123～1131.

Relative Articles

Supplements(0)

Cited By

Proportional views