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。
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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2005年第1期38-41,共4页
Chinese Journal of Geotechnical Engineering
基金
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)
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
strength reduction technique
elasto-plastic FEM
dichotomy
karst cave
stability analysis
