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陕西一电厂的粉煤灰库区下部基岩内埋设有邻近水库的3~#输水隧洞,隧洞已建成且埋深较浅。粉煤灰坝填筑过程中的压重及碾压振动会引起下卧输水隧洞衬砌结构的围岩压力发生变化,从而对隧洞衬砌结构的安全造成威胁,需要评估。为此,利用ADINA建立隧洞衬砌结构的静、动力分析模型,分析粉煤灰坝填筑过程中的静力荷载作用及灰土、初期坝和各级子坝顶部振动碾压的静动力耦合作用对隧洞衬砌结构的影响,对静荷载作用下的隧洞衬砌结构进行偏压复核和剪压复核,并总结振动荷载下加速度幅值和竖向位移的空间分布规律。研究表明:随着粉煤灰的堆填,隧洞衬砌结构竖向位移和内力逐渐增大,其中,隧洞拱顶竖向位移最大,最大值达到了0.005 m,隧洞拱脚附近衬砌结构的轴力、剪力、弯矩最大;隧洞衬砌结构的轴向承载能力不符合要求,剪切承载能力符合要求;激振频率对振动加速度幅值的影响主要集中在40 m埋深范围内;动、静力荷载作用下隧洞衬砌结构最大值出现位置基本一致,静动力耦合作用下隧洞衬砌结构内力最大值为静力荷载作用下的1.01～1.09倍,静力荷载作用是影响隧洞衬砌结构内力的主要因素。
Abstract：In the underlying bed rock of the area of the fly-ash storage for a power plant in Shaanxi Province, the existing No.3 water conveyance tunnel of an adjacent reservoir is buried therein with a shallow buried depth. The filling weight and rolling vibration during the filling of the fly-ash dam can cause the pressure change of the surrounding rock of the lining structure for the underlying water conveyance tunnel, thus threaten the safety of the tunnel lining structure, for which a relevant assessment is necessary to be made. Therefore, ADINA software is adopted to establish the static and dynamic analysis model of the tunnel lining structure, and then the influences of the static load effect and the static and dynamic coupling effect from the vibration rolling on the fly-ash soil layer, the tops of the initial dam and the sub-dams of all the stages during the filling of the fly-ash dam are analyzed and the bias-pressure and shear-compression rechecks are made on the tunnel lining structure under the static load effect, while the spatial distribution laws of the acceleration amplitude and the vertical displacement under the vibration load are summarized as well. The study shows that following with the landfill of fly-ash, both the vertical displacement and the internal force of the tunnel lining structure are gradually increased, in which the vertical displacement of the tunnel vault is the largest with the maximum value up to 0.005 m, while the axial force, shear force, bending moment of the lining structures are the largest near the arch foot of the tunnel. Meanwhile, the axial bearing capacity of tunnel lining structure cannot meet the relevant requirements, but the shear-bearing capacity can satisfy the requirements concerned, while the influence from the exciting frequency on the vibration acceleration amplitude is mainly concentrated within the buried depth of 40 m. The occurring positions of the maximum value of the tunnel structure under dynamic and static load effects are basically the same, while the maximum values of the internal force of the tunnel structure under dynamic and static coupling effect are 1.01～1.09 times those under the static load effect, and then the static load effect is the main factor to affect the internal force of the tunnel lining structure.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2021.02.008
中图分类号:TV672.1
引用信息:
[1]胡锦方,张爱军,韩婧文.粉煤灰坝填筑压重和振动对下卧输水隧洞的影响[J],2021,52(02):69-80.DOI:10.13928/j.cnki.wrahe.2021.02.008.
基金信息:
国家自然科学基金项目(51978572);; 陕西省重点研发计划项目(2017ZDXM-SF-074);; 陕西省水利科技计划项目(2013slkj-10)