中南大学学报（自然科学版）Issue(6)：2267-2273,7.DOI:10.11817/j.issn.1672-7207.2015.06.039
不同饱和度下破碎软岩隧道掌子面破坏范围上限分析
Upper bound analysis of collapsing area of tunnel face in broken soft rocks under different saturations
摘要
Abstract
Based on the multi-blocks failure mechanism, a computing method for estimating the scale of the collapsing area of the tunnel face under different degrees of saturation was proposed by non-linear Hoek−Brown failure criterion and the relationship between the strength of soft rocks and saturation. Taking the accident of water gushing and mud outburst in Yaozhai Tunnel as an example, the scope of the collapsing area in the front of the tunnel face was computed under different degrees of saturation. The results show that the compressive strength of rock decreases gradually with the increase of the degree of saturation, so does the cohesion and internal friction angle which is obtained by the parameter transformation. However, both the scale of collapsing area of the tunnel face and the supporting forces tend to increase with the increase of the saturation. When the saturation is 0.8, the failure surface extends to the earth’s surface and the supporting force approaches 651.541 kPa. Moreover, some geological disasters such as water gushing, mud gushing and the landslides will occur if the failure surface extends without any protective measurement. The greatest advantage of this proposed method is that the range of the collapsing area of the tunnel face can be determined even based on a few experimental parameters, which can be regarded as a kind of estimating approach for tunnel design and construction.关键词
破碎软岩/隧道掌子面/饱和度/上限分析/突水突泥Key words
broken soft rocks/tunnel face/degree of saturation/upper bound analysis/water gushing and mud outburst分类
交通工程引用本文复制引用
杨子汉,杨小礼,张佳华,李永鑫..不同饱和度下破碎软岩隧道掌子面破坏范围上限分析[J].中南大学学报（自然科学版）,2015,(6):2267-2273,7.基金项目
国家自然科学基金资助项目(51178468 （）
51378510)；湖南省研究生科研创新资助项目(CX2014B069)(Projects (51178468 （CX2014B069）
51378510) supported by the National Natural Science Foundation of China （）
Project (CX2014B069) supported by Graduated Student Research and Innovation Project of Hunan Province) （CX2014B069）
