节理间距对柱状节理玄武岩隧洞稳定的影响研究

doi:10.13722/j.cnki.jrme.2014.0744

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摘要在提出一种改进的包含节理间距的柱状节理模型的基础上，针对节理间距、节理倾角、围压三者联合作用对柱状节理岩体应力–应变曲线、岩体强度的影响进行了深入的研究。研究结果表明：(1) 节理间距增大至一定程度时，其岩体强度等于岩块强度；节理间距减小至一定程度时，其岩体强度等于遍布节理强度；(2) 节理间距对岩体应力–应变曲线的3个阶段均有较大影响，弹性变形、屈服强度和残余强度，均随着节理间距的增大而增大；(3) 当围压增高时，节理间距导致的岩体劣化特征减弱，到达岩块强度和遍布节理强度的节理间距均减小；(4) 当某一节理面倾角小于或者大于时，岩体不沿节理面破坏，即使改变节理面间距，其强度也不发生变化；而当节理面倾角大于小于时，岩体沿节理面发生破坏，并且随着节理面间距的增大，强度增大；(5) 一类柱状节理可以按照遍布节理模型来考虑，但是二类、三类柱状节理由于节理间距较大不能按照遍布节理来考虑，而应采用本文所提出的包含节理间距的柱状节理模型。

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关键词 ：岩石力学, 节理间距, 遍布节理, 柱状节理, 硐室稳定

Abstract：On the basis of an improved joint model containing joint spacing，the influence of joint spacing，joint angle and confining pressure on rock mass stress-strain curve，strength have been carried out. The results show that：(1) When joint spacing increases to a certain extent，the rock mass strength is equal to the rock strength，and when joint spacing decreases to a certain extent，the rock mass strength is equal to the ubiquitous joint strength. (2) Joint spacing has a great influence on the three stages of the rock mass stress-strain curve：the elastic deformation，yield strength and residual strength are all increased with the increase of joint spacing. (3) If the confining pressure is increased，the rock mass degradation characteristics induced by joint is abate，and the joint spacing which reach the rock strength or ubiquitous joint strength，decreases with the increased confining pressure. (4) When a joint plane angle is less than or greater than ，the rock mass would not crack along the joint plane，and even if the joint spacing is changed，the strength would not change under this angle. When the joint plane angle is greater than and smaller than ，the rock mass would crack along the joint plane，and with the increase of joint spacing，the rock mass strength would increase. (5) The first type of columnar joints can be consider as ubiquitous joint model，but the second or third type of columnar jointed rock mass can't be considered as ubiquitous joint model due to their larger joint spacing. The columnar jointed model containing joint spacing proposed by this paper is more applicable for the columnar jointed rock mass.

Key words： rock mechanics joint spacing ubiquitous joint columnar jointed tunnel stability

引用本文:

郝宪杰，冯夏庭，周扬一，李邵军，段淑倩，李帅军. 节理间距对柱状节理玄武岩隧洞稳定的影响研究[J]. 岩石力学与工程学报, 2015, 34(s1): 3337-3347.
HAO Xianjie，FENG Xiating，ZHOU Yangyi，LI Shaojun，DUAN Shuqian，LI Shuaijun. INFLUENCE OF JOINT SPACE TO STABLITY OF COLUMNAR JOINTED BASALTIC ROCK MASS. , 2015, 34(s1): 3337-3347.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0744 或 http://www.rockmech.org/CN/Y2015/V34/Is1/3337

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