| 基桩下溶洞顶板稳定性评价的强度折减有限元法 |
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| 引用本文： | 程晔,赵明华,曹文贵.基桩下溶洞顶板稳定性评价的强度折减有限元法[J].岩土工程学报,2005,27(1):38-41. |
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| 作者姓名： | 程晔 赵明华 曹文贵 |
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| 作者单位： | 湖南大学岩土工程研究所；湖南大学岩土工程研究所 湖南长沙；410082；湖南长沙； |
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| 基金项目： | 中国高等学校博士学科点专项基金资助项目(200020532008)，国家自然科学基金资助项目(50378036) |
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| 摘 要： | 定义溶洞顶板稳定性安全系数为顶板岩体实际剪切强度与折减到临界破坏时的剪切强度之比值。综合运用强度折减技术、弹塑性有限元和二分法探讨基桩下溶洞顶板稳定性的评价方法。研究表明,该方法不仅可得到能表征溶洞顶板稳定性且物理意义明确的安全系数,还可获得可能的破坏面及破坏过程,与传统方法相比,具有明显的优越性。实例证明了其可行性与有效性。该方法为基桩下溶洞顶板稳定性分析与评价提供了新的思路与方法, 具有重要的理论意义与工程实用价值。
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| 关 键 词： | 强度折减技术 弹塑性有限元 二分法 溶洞 稳定性分析 |
| 文章编号： | 1000-4548(2005)01-0038-04 |
Study on stability evaluation of karst cave roof with strength reduction FEM |
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| CHENG Ye,ZHAO Minghua,CAO Wengui.Study on stability evaluation of karst cave roof with strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2005,27(1):38-41. |
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| Authors: | CHENG Ye ZHAO Minghua CAO Wengui |
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| Affiliation: | Geotechnical engineering institute of Hunan university Changsha 410082 China |
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| Abstract: | The safety factor of karst cave roof is defined as the ratio of actual shear strength parameter to critical failure shear strength parameter in this paper. Stability of karst cave roof was analyzed with strength reduction technique, elasto-plastic FEM and dichotomy. Then, not only the safety factor of karst cave roof with specific physics meaning can be obtained, but the overall failure process and the location of failure surface may also be determined at the same time, So the present method is obviously superior to those traditional methods. The calculated results of a few engineering examples prove that the proposed method is effective in analyzing the stability of karst cave under the pile tip. |
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| Keywords: | strength reduction technique elasto-plastic FEM dichotomy karst cave stability analysis |
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