摘要
在工程施工巷道围岩基本特征分析和岩体质量级别确定的基础上,采用广义Hoek-Brown强度准则,估算了Ⅲ级岩体的强度参数,并按Hoek(2006)的公式估算了变形参数;根据巷道的拱顶沉降和净空收敛变形监测,按正交试验设计原理进行了有限元位移反演,获得了Ⅲ级岩体强度和变形参数。通过两者的对比发现:估算结果与反演结果基本一致,最终根据反演结果的岩石材料常数mi值较准确,以及估算结果的岩体变形模量Em值较准确的原则,确定了Ⅲ级岩体的强度参数和变形参数。
Rock mass mechanical parameters are the difficulty and focus of the engineering stability and are more important to construction and safe operation of the underground oil storage caverns. Based on the a- nalysis of surrounding rock characteristic and rock mass classification of the access tunnel, the strength pa- rameters of rock mass in-class Ill are estimated by the generalized Hock-Brown criterion and the deforma- tion parameters are estimated by Hock（2006） formulation in this paper. According to the monitoring data of vault subsidence and sidewall convergence, a displacement inversion by Finite Element Method is crea- ted to gain the rock mass strength and deformation parameters of class Ⅲ. The numerical experiments are optimized by orthogonal design. The results showed that the estimation and the inversion are similar. The inversion mi is more accurate but the estimation Em is better. Subsequently the rock mass strength and de- formation parameters of class Ⅲ are integrated. This research has the engineering significance to evaluate the safety of underground oil storage caverns.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第6期186-190,共5页
Geological Science and Technology Information
基金
岩土钻掘与防护教育部工程研究中心开放课题基金项目(201305)
北京市科学技术委员会重点项目(20090102-2796)
关键词
岩体力学参数
广义Hoek—Brown估算
位移反演
正交试验
地下石油储备库
rock mass mechanical parameter
generalized Hoek-Brown estimation
displacement inversion
orthogonal experiment ~ underground oil storage cavern
