地震工程学报2017，Vol.39Issue(3)：488-495,8.DOI:10.3969/j.issn.1000-0844.2017.03.0488
基于岩体波速和Hoek-Brown准则的初始地应力场参数计算模型研究
Study on Parameter Calculation Model of Initial Ground StressFields Based on the Wave Velocity of a Rock Massand the Hoek-Brown Criterion
欧哲 1杨家富 2王铁 2张光权 1邹明1
作者信息
- 1. 宏大国源(芜湖)资源环境治理有限公司,安徽 芜湖 241200
- 2. 宏大爆破有限公司,广东 广州 510623
- 折叠
摘要
Abstract
The wave velocity of a rock mass and the Hoek-Brown criterion are introduced to enable the building of a calculation model of the range of values of horizontal geostresses (σH) in an initial ground stress field.The rationality of this calculation model is evaluated by the measured geostress data.Based on the ΔσH calculation model, a Δ(σH/σV) calculation model of the values range of the ratio of the horizontal and vertical geostresses (σH/σV) is deduced;this model is then used to provide a reasonable explanation of the σH/σV distribution of phenomenon in the surface and deep of earth''s crust is given from the perspective of rock mass stability.The coefficient of horizontal pressure (λ) is calculated via the lower ((σH/σV)min) and upper ((σH/σV)max) limits of σH/σV, which is given by the Δ(σH/σV), and comparative analysis of the calculated and measured values of λ is performed.Results show that the calculated and measured λ present consistent characteristics in a shallow rock mass but significant differences in a deep rock mass.Thus, the Δ(σH/σV) calculation model is applicable to λ calculations in shallow rock mass engineering.The calculated λ presents obvious nonlinear variation features along the depth (h) direction, and the functional relationship λ=ahb+1 between λ and h is given by setting up appropriate boundary conditions;this functional relationship is confirmed by curve fitting.The fitting results show a very high fitting correlation coefficient for λ=ahb+1, which means it can describe the functional relationship between λ and h well.This functional relationship can be used for initial geostress field evaluations and provides the necessary initial geostress field conditions for simulating deformation and failure of excavated rock masses.关键词
岩体波速/Hoek-Brown准则/初始地应力场/水平地应力/侧压系数/非线性函数关系Key words
rock mass wave velocity/Hoek-Brown criterion/initial ground stress field/horizontal geostress/coefficient of horizontal pressure/nonlinear function relation分类
建筑与水利引用本文复制引用
欧哲,杨家富,王铁,张光权,邹明..基于岩体波速和Hoek-Brown准则的初始地应力场参数计算模型研究[J].地震工程学报,2017,39(3):488-495,8.
