摘要
准确的地应力实测资料是确定地下岩体力学性质，进行工程结构设计施工、围岩安全稳定性分析和科学化决策的必要前提和基础。然而，应力解除法求解地应力无法考虑非理想岩性问题，工程应用中采用的忽略或修正的处理方法必将造成较大的误差。根据有限单元法的原理，针对正交各向异性岩体，分别采用理想模型和正交各向异性模型开展了地应力求解研究。结果表明：岩体弹模会造成应力分量误差最大可达56％，第一主应力大小误差为15％～26％，方位角误差为30％～37％，倾角误差为23％～57％。
Accurate ground stress measuring data is the necessary premise and basis of engineering structure de sign and construction, analysis on surrounding rock safety and stability, and scientific decision, it is also important for determining the underground rock mechanics properties. However, stress relieving method could not consider non ideal lithology problem, which was often ignored or modified in engineering application, and it would cause greater er ror. According to the principle of finite element method, in view of the orthogonal anisotropic rock mass, the ideal model and orthogonal anisotropic model were respectively applied to ground stress research. The results showed that the elastic modulus of rock mass could cause stress component error up to 56%, the first principal stress size error was in range of 15% 26% , the azimuth error was 30% 37% , and angle error was 23% 57%.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第6期1298-1303,共6页
Chinese Journal of Underground Space and Engineering
基金
新世纪优秀人才支持计划(NCET-10-0771)
关键词
正交各向异性岩体
地应力
有限元模型
应力误差
orthogonal anisotropic rock mass
ground stress
the finite element model
stress error
