CAJ | 학술논문

以大岗山水电站主厂房顶拱坍塌体的复合支护结构为研究背景,分析治理措施的加固效果.基于精细的复合衬砌结构承载力分析方法,给出各层钢拱架和喷射混凝土各自的受力状况,对塌方体复合支护结构的稳定性进行分析.研究表明,顶拱坍塌段治理后,开挖完成后增量位移量值约为90 mm,顶拱部位塑性区基本无变化,后继开挖中锚索内力变化程度较小,开挖结束后各锚索内力与张拉吨位相差不大,且均未超过设计吨位,显示出较好支护效率与安全裕度;开挖完成后,除初期支护在塌腔附近的部分喷射混凝土可能发生潜在的剪切破坏外,作为复合衬砌组主要受力部件的Ⅰ、Ⅱ期治理复合衬砌的钢拱架和喷混凝土受力状态均较为良好,整个复合衬砌组的承载力余量较大.计算结果与监测结果的吻合度良好,较好地反映出岩体变形和支护结构内力随洞室开挖的发展规律.
이대강산수전참주엄방정공담탑체적복합지호결구위연구배경,분석치리조시적가고효과.기우정세적복합츤체결구승재력분석방법,급출각층강공가화분사혼응토각자적수력상황,대탑방체복합지호결구적은정성진행분석.연구표명,정공담탑단치리후,개알완성후증량위이량치약위90 mm,정공부위소성구기본무변화,후계개알중묘색내력변화정도교소,개알결속후각묘색내력여장랍둔위상차불대,차균미초과설계둔위,현시출교호지호효솔여안전유도;개알완성후,제초기지호재탑강부근적부분분사혼응토가능발생잠재적전절파배외,작위복합츤체조주요수력부건적Ⅰ、Ⅱ기치리복합츤체적강공가화분혼응토수력상태균교위량호,정개복합츤체조적승재력여량교대.계산결과여감측결과적문합도량호,교호지반영출암체변형화지호결구내력수동실개알적발전규률.
A stability study is conducted for the top-arch collapse composite treatments of the Dagangshan Hydropower Station, based on a sophisticated analysis approach of the composite linings. The performance of the treatments during excavation is analyzed. The internal forces of the I-beams and the shorcrete are presented respectively for the distinct phases of treatment. In this manner, the stability of the treatments are discussed. The results indicate that the maximum incremental displacement after treatment is about 9 cm. Fail zones of the top-arch remain broadly unchanged afterwards. The changes of the cables’ internal force are relatively small, suggesting a good supporting efficiency and safety level. Although the initial treatments may suffer potential cracking, as the main components of the treatments, the phaseⅠand phaseⅡtreatments are in a good state. Therefore the stability of the entire treatment system may be insured. Monitored data are generally agree well with the calculated ones;the analysis reliably reflect the real rock mass deformation and the internal forces state of the supporting structures.