CAJ | 학술논문

为了分析隧道复合式衬砌在围岩蠕变过程中的受力规律,利用有限元程序ANSYS建立计算模型,采用广义开尔文本构关系,分别分析了二次衬砌在不同支护时机和不同刚度下,复合式衬砌的受力规律.分析结果表明:在不同的时机施加二衬,其受力都有一个逐步增大并趋于稳定的过程,初支与二衬受力随二衬支护时机的变化趋势是相反的;二衬支护越早,其受力越大.通过早施作二衬,来转移初支上的应力是不合适的.当二衬刚度增加时,其所分担的围岩压力将增大,而初支分担的围岩压力有一定的减小.结合云腾岭隧道进行具体分析,得出该隧道二次衬砌的最佳支护时间为开挖后第40天.另外,通过对该隧道现场监控量测分析发现,二衬的受力-历时曲线与有限元分析相吻合.
위료분석수도복합식츤체재위암연변과정중적수력규률,이용유한원정서ANSYS건립계산모형,채용엄의개이문본구관계,분별분석료이차츤체재불동지호시궤화불동강도하,복합식츤체적수력규률.분석결과표명:재불동적시궤시가이츤,기수력도유일개축보증대병추우은정적과정,초지여이츤수력수이츤지호시궤적변화추세시상반적;이츤지호월조,기수력월대.통과조시작이츤,래전이초지상적응력시불합괄적.당이츤강도증가시,기소분담적위암압력장증대,이초지분담적위암압력유일정적감소.결합운등령수도진행구체분석,득출해수도이차츤체적최가지호시간위개알후제40천.령외,통과대해수도현장감공량측분석발현,이츤적수력-력시곡선여유한원분석상문합.
In order to analyze the mechanical rules of double-lining in creeping surrounding rock tunnel, a finite element model is established based on the finite element program ANSYS. Using generalized Kelvin constitutive relation, the mechanical rules of double-lining are analyzed when secondary lining is applied at different support time or different stiffness. The analysis results indicate that the stress of secondary lining increases gradually, and then tends to be stable when it is applied at different support time. The stress of primary support and secondary lining are opposited following the secondary support time. The earlier the secondary lining the greater the stress. It is not appropriate to transfer the stress of primary support through applying secondary lining earlier. When the stiffness of secondary lining increases, surrounding rock pressure which is shared by secondary lining will increase and primary support will decrease. According to the analysis of Yuntengling tunnel, the best supporting time of secondary lining for this tunnel is fortieth day after excavation. Moreover, through monitoring analysis of this tunnel, time vs. the stress curve of secondary lining is consistent with the finite element analysis results.