| 溶洞顶板极限承载力研究 |
| |
| 引用本文： | 李仁江,盛谦,张勇慧,景锋,冷先伦.溶洞顶板极限承载力研究[J].岩土力学,2007,28(8):1621-1625. |
| |
| 作者姓名： | 李仁江 盛谦 张勇慧 景锋 冷先伦 |
| |
| 作者单位： | 中国科学院武汉岩土力学研究所,武汉,430071 |
| |
| 摘 要： | 针对国标《工程岩体分级标准》1]中Ⅲ、Ⅳ类岩体条件,采用显式有限差分法,对岩溶地区扩大基础下椭球状溶洞顶板稳定性进行了分析。通过对溶洞顶板的应力和位移变化规律及塑性区演化规律研究,得出在两种岩体条件下不同溶洞跨度和顶板厚度时溶洞顶板的极限承载力,绘出了溶洞跨度、顶板厚度对极限承载力的联合影响曲面。溶洞顶板的极限承载力随溶洞跨度的增大而减小,随溶洞顶板厚度的增大而增大。在其他条件相同时,Ⅳ类岩体的溶洞顶板极限承载力仅为Ⅲ类岩体的1/3左右。
|
| 关 键 词： | 溶洞 顶板 扩大基础 有限差分法 极限承载力 |
| 文章编号： | 1000-7598-（2007）08-1621-05 |
| 收稿时间： | 2006-04-24 |
| 修稿时间： | 2006-04-242006-09-28 |
Study on ultimate bearing capacity of upper rock plate of karst cave |
| |
| LI Ren-jiang,SHENG Qian,ZHANG Yong-hui,JING Feng,LENG Xian-lun.Study on ultimate bearing capacity of upper rock plate of karst cave[J].Rock and Soil Mechanics,2007,28(8):1621-1625. |
| |
| Authors: | LI Ren-jiang SHENG Qian ZHANG Yong-hui JING Feng LENG Xian-lun |
| |
| Institution: | Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 43007l, China |
| |
| Abstract: | FLAC3D is applied to analyze the stability and the ultimate bearing capacity of upper plate of karst cave under the loading of rectangular spread foundation;and two typical types of rock mass are studied.The ultimate bearing capacity of upper plate of karst cave in various engineering conditions are presented by analyzing the characteristics of rock stress and displacement and the whole evolvement process of plastic zones in the upper plate.The results show that the ultimate bearing capacity increases with the increasing of the thickness of upper plate and decreases with the increasing of the width of karst cave.In the same conditions,the ultimate bearing capacity of rock IV is only one third of rock III. |
| |
| Keywords: | karst cave upper plate spread foundation finite difference method ultimate bearing capacity |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
