摘要
地下岩体的垂直应力一般可用其上部覆盖岩体的平均比重乘以其深度来估算,但是水平应力却很难估算。基于岩石断裂韧度是一个常数,利用共线裂纹模型建立裂隙岩体的稳定条件,并应用该稳定条件来估算水平应力的范围。估算结果符合现场的测试结果,表明这一估算方法是有效的、可行的。利用该裂隙岩体稳定条件能很好地解释水平应力与垂直应力之比在浅部地壳中分布在较宽的范围内,但在深部区域内却分布在一个狭小的范围内这一现象。
The vertical stress of underground rock mass can be evaluated by depth times the average unit weight of overlying rock mass. However, horizontal stress is difficult to estimate. Based on the fact that rock fracture toughness is a constant, two-collinear crack model is applied to establish the stability condition of fractured rock mass. From this stability condition, the range of horizontal stress can be evaluated： and the evaluation result agrees well with in-situ measurement results, so that indicating the evaluation method is effective and feasible. Through the stability condition of fractured rock mass, we can well explain the phenomenon that the ratio of horizontal stress to vertical stress in shallow zone is scattered in a wide range： but in deep zone, it is scatted in a narrow range.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第8期1721-1728,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51074109)
国家重点基础研究发展计划(973)项目(2010CB732005)
教育部科研创新团队(IRT1027)
关键词
岩石力学
水平应力
应力强度因子
裂纹
地下岩体
rock mechanics
horizontal stress
stress intensity factor
crack
underground rock mass.
