CAJ | 학술논문

锦屏二级水电站大理岩在高的地应力条件作用下表现出破裂随时间扩展的现象，给引水隧洞的运行期安全产生重大的影响。现场开挖后出现的滞后破裂现象、锚杆应力计和声波测试都反映出大理岩破裂随时间发展的特征。首先采用室内试验和数值分析，证明破裂是大理岩开挖后的主要响应方式，表明锚杆应力计和声波测试在现场测试中具有更好的适用性，而多点位移计敏感性较差。利用GSI随时间指数递减代表大理岩强度随时间递减，进而表征隧洞开挖损伤区随时间的增加而增加，在此基础上，建立应力腐蚀模型 SC。将现场已获得的监测数据作为SC模型中相关参数的校核依据，对大理岩的长期力学响应、锚杆受力状态和衬砌结构安全性进行详细分析，采用SC模型得出的特征与现场实际开挖响应具有很好的一致性。
금병이급수전참대리암재고적지응력조건작용하표현출파렬수시간확전적현상，급인수수동적운행기안전산생중대적영향。현장개알후출현적체후파렬현상、묘간응력계화성파측시도반영출대리암파렬수시간발전적특정。수선채용실내시험화수치분석，증명파렬시대리암개알후적주요향응방식，표명묘간응력계화성파측시재현장측시중구유경호적괄용성，이다점위이계민감성교차。이용GSI수시간지수체감대표대리암강도수시간체감，진이표정수동개알손상구수시간적증가이증가，재차기출상，건립응력부식모형 SC。장현장이획득적감측수거작위SC모형중상관삼수적교핵의거，대대리암적장기역학향응、묘간수력상태화츤체결구안전성진행상세분석，채용SC모형득출적특정여현장실제개알향응구유흔호적일치성。
The marble of Jinping II hydropower station diversion tunnel shows a phenomenon of crack propagation with time under high geostress,which impacts significantly the run-time safety of diversion tunnel. The lag fracture after excavation,monitoring results by bolt stress meter and sound wave test all reflect the characteristic of crack propagation with time. The laboratory test and numerical analysis are adopted to prove that the fracture is the main response way of marble after excavation,which indicates that a bolt stress meter and sound wave test have better applicability,and multipoint displacement meter sensitivity is worse. The behavior of GSI decreasing exponentially with time is used to stand for marble strength decreasing with time,and further behalf on tunnel excavation damage zone increasing with time. Based on the theory,the stress corrosion(SC) model is set up. The obtained field monitoring and testing data are used to check the related parameters of SC model. The long-term mechanical response of marble,anchor stress state and lining structure security are analyzed in detail;and these characteristics consist well with the actual excavation response.