溶洞顶板极限承载力研究-岩土力学.PDF
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第28 卷第8 期 岩 土 力 学 Vol.28 No.8
2007 年8 月 Rock and Soil Mechanics Aug. 2007
文章编号:1000-7598 -(2007) 08 ―1621―05
溶洞顶板极限承载力研究
李仁江,盛 谦,张勇慧,景 锋,冷先伦
(中国科学院武汉岩土力学研究所,武汉 430071 )
[1]
摘 要:针对国标 《工程岩体分级标准》 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
中图分类号:TU 443 文献标识码:A
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
(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
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