CAJ | 학술논문

采用大型通用有限元软件 ABAQUS 对某室内模型试验进行了数值模拟，验证了三维有限元法进行洞室结构稳定性分析的可靠性。结合永武（永安-武平）高速公路 A11合同段岩溶地质资料，将溶洞近似为与实际相近的椭球状，建立岩溶区路堤的三维有限元模型，分析溶洞顶板厚度、填方高度、溶洞位置以及溶洞充填状况对路堤及溶洞顶板稳定性的影响。为与现行顶板安全厚度确定方法进行比较，进行二维平面应变有限元分析。研究表明，对于较完整的顶板岩层，按顶板受拉破坏稳定安全系数为4确定的安全厚度过于保守，按梁板理论弯曲受拉破坏确定的安全厚度也偏于保守，是由于实际顶板岩层并不完全符合梁板理论的简化假设，而以有限元分析所得最大弯矩按梁板弯曲受拉破坏确定的安全厚度最为经济；实际工程中三维效应明显的溶洞，现行理论简化和二维数值分析法都较为粗糙，宜采用三维数值分析法。通过对上述问题的分析，为该高速公路岩溶区填方路段的设计和溶洞的处治与否提出指导性意见，已创造较好的经济效益和社会效益，可供类似工程应用时参考。
채용대형통용유한원연건 ABAQUS 대모실내모형시험진행료수치모의，험증료삼유유한원법진행동실결구은정성분석적가고성。결합영무（영안-무평）고속공로 A11합동단암용지질자료，장용동근사위여실제상근적타구상，건립암용구로제적삼유유한원모형，분석용동정판후도、전방고도、용동위치이급용동충전상황대로제급용동정판은정성적영향。위여현행정판안전후도학정방법진행비교，진행이유평면응변유한원분석。연구표명，대우교완정적정판암층，안정판수랍파배은정안전계수위4학정적안전후도과우보수，안량판이론만곡수랍파배학정적안전후도야편우보수，시유우실제정판암층병불완전부합량판이론적간화가설，이이유한원분석소득최대만구안량판만곡수랍파배학정적안전후도최위경제；실제공정중삼유효응명현적용동，현행이론간화화이유수치분석법도교위조조，의채용삼유수치분석법。통과대상술문제적분석，위해고속공로암용구전방로단적설계화용동적처치여부제출지도성의견，이창조교호적경제효익화사회효익，가공유사공정응용시삼고。
Firstly, an indoor model test was modeled by using the large-scale all-purpose finite element software, ABAQUS and 3D finite element method to verify the reliability of the stability analysis of cave structures. Then, based on the karst geological data of the contract section A11 in Yongan-Wuping highway, the karst caves were approximately regarded as the ellipsoids and the 3D finite element models were established to analyze how the stability of the embankment and the karst cave roof is influenced by roof thicknesses, filled heights, karst cave locations and filling conditions of karst caves. Also, the 2D plain strain finite element method was adopted to make a comparison with the prevailing method for safe thicknesses of karst cave roofs. Research shows that,for cave roof strata which are relatively intact, the safe thicknesses of cave roofs obtained by using 4 as the stability factor of safety of roof tensile failure are too conservative. The safe thicknesses of cave roofs obtained by the beam-slab theory of bending tensile failure are inclined to be conservative too. This is because the actual roof strata do not coincide completely with simplified hypothesises of the beam-slab theory. However, based on the beam-slab theory of bending tensile failure, the safe thicknesses calculated by the maximum bending moments obtained from the finite element analysis are the most economical. For actual karst caves which have obvious 3D effects,the prevailing simplified theory and 2D numerical analysis method are relatively coarse and the 3D numerical analysis method should be adopted. Through analyzing the above problems, the research work offers guidance to the embankments design and karst cave treatment of the highway in the karst regions. Good socioeconomic benefits are obtained. It can be used as a reference for similar engineering application.