青岛城市地下空间稳定性三度区域划分研究

针对青岛独特的上软下硬地层城市地质环境特征,文中采用基于有限元强度折减的数值计算方法和基于现场监测数据的统计分析方法,对青岛城市地下空间稳定性区域划分进行了系统研究。从围岩稳定性角度出发,提出了“难区域(R_D1)—易区域(R_E)—难区域(R_D2)”三度区域的概念,并指出上软下硬地层城市地下空间稳定性区域划分问题的研究重点是R_D1与R_E分布范围及分界覆岩厚度H_r(D1-E);软弱地层厚度H_s越大,开挖跨度D越大,R_D1分布范围越大,R_E分布范围越小,H_r(D1-E)越大,反之 H_r(D1-E)越小。研究成果为城市地下空间的合理开发利用提供了理论基础和依据。

Research on the Stability Region Division of Urban Underground Space of Qingdao City

For the unique characteristics of urban geological environment in upper-soft and lower-hard stratum of Qingdao city, the stability region division of urban underground space of Qingdao is systematically studied adopting the numerical calculation method based on the finite element strength reduction, and the statistical analysis method by the field monitoring data. The conception of three degree regions which contain “Difficult Region (RD1)--Easy Region (RE)--Difficult Region (RD2)” is proposed from the view of stability of surrounding rock. The distribution range of RD1 and RE, and the boundary stratum thickness Hr(D1-E) are the research core and key that the problem of the stability region division of urban underground space in upper-soft and lower-hard stratum. The greater Hs is as well as the greater D is, the greater the distribution range of RD1 is and the smaller RE is, and the greater Hr(D1-E) is; conversely the smaller Hr(D1-E) is. The research result provides a theoretical basis for the reasonable development and utilization of urban underground space.