CAJ | 학술논문

北京地区十三陵抽水蓄能电站的引水洞穿过破碎岩体时,因地质条件很差而在开挖初期发生了塌方险情.抢险后及时进行了洞内位移监测.监测结果显示原设计所使用的挂网锚喷加钢拱架组成的支护结构变形较大,特别是在边墙部位,变形更加明显.根据监测结果对引水洞的支护方案进行了重要修改:加密钢拱架和挂网钢筋,并增加喷射混凝土厚度,在洞底增加仰拱.施行上述措施后,洞体位移收敛变小,并趋于稳定,达到了设计和安全使用要求.该可变更设计的成功,充分说明了在工程地质条件复杂,难以准确界定的情况下,信息化施工与可变更设计的重要性.
북경지구십삼릉추수축능전참적인수동천과파쇄암체시,인지질조건흔차이재개알초기발생료탑방험정.창험후급시진행료동내위이감측.감측결과현시원설계소사용적괘망묘분가강공가조성적지호결구변형교대,특별시재변장부위,변형경가명현.근거감측결과대인수동적지호방안진행료중요수개:가밀강공가화괘망강근,병증가분사혼응토후도,재동저증가앙공.시행상술조시후,동체위이수렴변소,병추우은정,체도료설계화안전사용요구.해가변경설계적성공,충분설명료재공정지질조건복잡,난이준학계정적정황하,신식화시공여가변경설계적중요성.
When the diversion tunnel of Ming Tombs pumped storage station in Beijing passed through the fragmented rock mass, landslip happened in the early stage of excavation because of bad geological conditions. Displacement monitoring was performed in time after landslip. The monitored results showed that support structure composed of anchoring shotcrete with wire mesh and steel arch frame used by the original design had great deformation, especially in the side walls. According to the monitored results, supporting scheme for the diversion tunnel was modified significantly. For example, steel arch frames and reinforced bars for the wire mesh were increased. Sprayed concrete was thickened. The inverted arch was added for the tunnel floor. After the above measures were constructed, the displacement of the tunnel has decreased and the deformation has stabilized. The displacement and deformation have reached the design and operation requirements. The successful design illustrates that the monitoring during construction for design change is very important under complicated engineering geologic conditions. Design of other tunnels can draw lessons from this case study.