CAJ | 학술논문

为了研究洞室群开挖过程中围岩应力集中效应放大现象的变化规律，本文根据不同的截面形状、不同的水平距离、不同的空间位置，利用3D-Sigma软件设计了4组洞室群模型，第1组包含5个模型，其他组均包含3个模型，以此来模拟后期开挖洞室的不同布置方案对前期洞室的影响规律。通过在拱顶、拱底和左右拱脚等部位设立应力监测点，得到了后期洞室群开挖过程中前期洞室围岩中代表性部位应力值的变化。最后从最大主应力和最小主应力两个方面，详细分析了开挖过程中随着洞室间距以及后期开挖洞室位置的变化洞室群围岩应力集中情况，得出了洞室群开挖过程中围岩应力集中效应的放大规律。该规律对深部洞室群稳定性控制具有指导意义。
위료연구동실군개알과정중위암응력집중효응방대현상적변화규률，본문근거불동적절면형상、불동적수평거리、불동적공간위치，이용3D-Sigma연건설계료4조동실군모형，제1조포함5개모형，기타조균포함3개모형，이차래모의후기개알동실적불동포치방안대전기동실적영향규률。통과재공정、공저화좌우공각등부위설립응력감측점，득도료후기동실군개알과정중전기동실위암중대표성부위응력치적변화。최후종최대주응력화최소주응력량개방면，상세분석료개알과정중수착동실간거이급후기개알동실위치적변화동실군위암응력집중정황，득출료동실군개알과정중위암응력집중효응적방대규률。해규률대심부동실군은정성공제구유지도의의。
In order tostudy the variation law of theamplification phenomenon of stress concentration effect in the surrounding rock mass of tunnels,four different numerical models are constructed with 3D-Sigma soft-ware considering section shapes,spacing distances,spatial positions.The first group includes five numerical models and the other three groups include three numerical models.These numerical models are used to simu-late the impacts of the subsequently-excavated tunnel on the previously-excavated tunnel.During the numeri-cal modeling process,the stress concentration monitoring points are set respectively at the top and bottom of arch and the right and left arch springs of the section of the previously-excavated tunnel.The variation law of stresses at these monitoring spots can be got by analyzing the maximum and minimum principal stress magni-tudes during the subsequent steps.Four groups of models prove that there exist marked amplification phe-nomenon of stress concentration effect at the typical spots,i.e.the subsequent excavation makes the stress concentration effect more severe.This finding is of great significance to the stability control of deeply-buried group tunnels or caverns.