摘要
深埋巷道大变形、强流变的破坏特征源于其高地应力的作用,准确分析已开掘巷道塑性区分布对巷道围岩变形影响、开掘方案选择及后续类似条件巷道布置意义深远。在围岩力学参数测试、地应力场测试的基础上,采用弹塑性理论、M-C准则、修正的"当量半径"理论简化计算了直墙半圆拱形断面布置下深埋巷道的围岩塑性区大小,分析了巷道围岩塑性区受采动应力、侧压系数单独及耦合作用影响规律。在侧压系数为0.5、垂直压力为35MPa时底板塑性区最大,其值为2.65m,建议加强巷道底板的支护与维护,并给出了塑性区控制方案。研究结果可为后续类似条件下巷道开掘方案优选、支护设计及围岩稳定性判定提供一定的借鉴。
The brake characteristic of the deep mine tunnel, such as large deformation and strong theological, was responded to the high in-situ stress, thus it was very important to definitely analyze the influence of the plastic region distribution of tunnel on the deformation laws tunnel drift schemes, and later stability controlling. Based on geology mechanical and in-situ stress test, plastic region of Straight wall semicircle arch tunnel was calculated by Elastic-plastic theory, M-C criterion, and fixed Equivalent radius. Both the Mining stress and Lateral pressure coefficient affected the gateways surrounding rocks plastic region, and their single and coupling effect were analyzed. When λ=0.5, P=35MPa, the maximum plastic region of floor lane under gateways reached 2.65m, so the support and fixed should be intensify and a plastic region control scheme was given. This work can provide reference for selecting tunnel drift schemes, supporting design, and surrounding rock stability analyzing in the similar conditions.
出处
《实验力学》
CSCD
北大核心
2013年第5期657-662,共6页
Journal of Experimental Mechanics
基金
国家自然科学基金(51004002)
高等学校博士点新教师基金(20103415120001)
安徽省高校省级自然科学研究项目(KJ2012A088)
关键词
塑性区
深埋巷道
不同断面
地应力测试
plastic region
deep buried tunnel
different section
in-situ stress test
