摘要
运用FLAC3D应变软化模型,模拟分析了共和隧道深埋段某断面围岩及支护结构稳定性以及围岩塑性区的变化特点,结果表明:(1)拱顶位移>拱腰位移>拱脚位移,拱顶最大位移量约20 mm,底板有膨胀现象,但其绝对位移较小,为4.5 mm;(2)随着掌子面的向前推进,模拟特征断面上围岩及支护结构的位移及应力均有所增加;当掌子面与特征断面之间的距离大于30 m时,特征断面上各特征点的位移及应力基本趋于稳定,拱顶、拱腰和拱脚的位移收敛值分别为18 mm、15 mm及10 mm,竖向应力收敛值分别为31 MPa、22.5 MPa及7.5 MPa,水平应力收敛值分别为8.1 MPa、6.0 MPa及2.5 MPa。
Using the strain softening model of FLAC3D, taking one deep-buried section of Gonghe tunnel as an example, the surrounding rock and supporting structure stability of one section are analyzed, and the feature of plastic zone of the rock are analyzed, too. The results show that： （ 1 ） The displacement at vault is larger than that at span- drel arch and the one at spandrel arch is larger than that at the foot arch, the largest displacement value is about 20 mm. The floor has expansion phenomenon and the absolute displacement is small with the value of 4.5 mm ; （2） The displacement and stress of surrounding rock and supporting structure both increase with the heading face forward ; The displacement and stress is convergent when the distance between the section and heading face are more than 30 m. The displacement convergence of vault spandrel arch and foot arch is respectively 18 mm, 15 mm and 10 mm, the vertical stress is respectively 31 MPa, 22.5 MPa and 7.5 MPa and the horizontal stress is respectively 8.1 MPa, 6. 0 MPa and 2.5 MPa.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第6期1293-1297,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51104081)
甘肃省自然科学基金(1010RJZA063)
高等学校博士学科点专项科研基金资助课题(406057)
兰州交通大学'青蓝'人才工程基金资助计划资助(QL-08-16A)
重庆市国土房管局科技计划项目(2009-01)
川煤集团科技项目(2009-08)
关键词
深埋隧道
数值模拟
应变软化模型
deep-buried tunnel
numerical simulation
strain softening model
