摘要
为分析下伏采空区影响下高速公路场地的稳定性,依托延吉至长春高速公路工程,采用概率积分法和数值仿真计算石碑岭采空区覆岩最大剩余变形参数,研究工程荷载作用下采空区地表竖向变形特性,并评价沿线采空区场地稳定性和场地工程适用性,以及采空区影响下高速公路场地地表沉降对各影响因素的敏感性。研究结果表明,工程评价区内石碑岭采空区中3号煤层处覆岩剩余变形量较小,4号和6号煤层采空区覆岩剩余变形量最大达398 mm;在路基荷载和桥梁荷载作用下,4号、6号煤层采空区地表竖向变形较大,需引起工程重视;考虑采空区场地剩余变形参数、工程荷载影响深度、采空区地基容许变形值,可将工程场地的采空区划分为稳定、基本稳定和欠稳定3种状态,采空区覆岩的垮落断裂带深度均大于影响深度的2倍;K3评价区所在场地基本适宜工程建设,而K1、K2评价区场地适宜性较差,建议采取注浆加固和灌浆充填处理;各影响因素的敏感性由大到小排序为开采厚度、开采深度、宽高比、与地基交叉角度。
To analyze the stability of the expressway site affected by the underlying goaf,the probability integral method and numerical simulation model were used to calculate the maximum residual deformation parameters of the surface of the goaf at Shibeiling during the construction of the Highway from Yanji to Changchun.The vertical deformation characteristics of the surface of the goaf under engineering loads were studied.The stability and engineering applicability of the goaf site along the supporting engineering were evaluated.The sensitivity of the surface settlement of highway sites to various influencing factors under the influence of goaf areas were evaluated.The research results show that,the residual deformation of the overlying rock at the 3#coal seam in the goaf of Shibeiling in the engineering evaluation area is relatively small,while the residual deformation of the overlying rock in the goaf of the 4#and 6#coal seams reaches up to 398 mm.Under the action of roadbed and bridge loads,the vertical deformation of the surface of the goaf in the 4#and 6#coal seam goafs is large and requires attention.Considering the residual deformation parameters of the goaf site,the influence depth of the engineering load and the allowable deformation value of the goaf site,the goaf site of the engineering is divided into three states:stable,basically stable,and unstable.The depth of the collapse fracture zone of the overlying rock in the goaf is greater than twice the influence depth.The site of the K3 evaluation area is basically suitable for engineering construction,while the suitability of the site in the K1 and K2 evaluation areas is poor.It is recommended to adopt grouting reinforcement and grouting filling treatment for the goaf.The sensitivity of surface settlement of highway sites under the influence of goaf to various influencing factors is ranked in descending order:mining thickness、mining depth、ratio of width to height and angle of intersection with foundation.
作者
王学伟
满君
WANG Xuewei;MAN Jun(China Highway Engineering Consulting Corporations,Beijing 100089,China;China Ordnance Industry Survey And Geotechnical Institute Co.,Ltd.,Beijing 100053,China)
出处
《铁道勘察》
2023年第6期82-90,共9页
Railway Investigation and Surveying
关键词
公路工程
采空区
概率积分法
场地稳定性
参数敏感性
road engineering
goaf
probability integral method
site stability
parameter sensitivity
