CAJ | 학술논문

我国西南地区河谷深切，坝址区地貌及地质条件复杂，地下厂房的位置往往离库区较近，水库蓄水后，地下厂房围岩渗流特性将成为影响工程安全和正常运行的重要因素之一。为减小厂区渗漏并改善厂房围岩的渗透稳定性，工程设计采取防渗帷幕、排水孔幕和排水廊道等渗流控制措施。采用子结构、变分不等式和自适应罚函数相结合的方法(简称 SVA 方法)，开展了牙根二级水电站厂区整体三维渗流场分析，评价了厂区围岩渗流控制方案的合理性，并论证其优化的可能性。研究结果表明：厂区防渗排水系统的渗流控制效果显著，防渗排水系统设计方案总体上是合理、有效的；厂区上部排水系统对于以库水渗漏为主的渗流控制不起作用，高高程排水孔幕的间距可适当放宽；厂区副排水孔幕对减少厂区各洞室渗漏量、降低厂区围岩孔隙水压力并改善围岩的稳定性具有显著作用。
아국서남지구하곡심절，패지구지모급지질조건복잡，지하엄방적위치왕왕리고구교근，수고축수후，지하엄방위암삼류특성장성위영향공정안전화정상운행적중요인소지일。위감소엄구삼루병개선엄방위암적삼투은정성，공정설계채취방삼유막、배수공막화배수랑도등삼류공제조시。채용자결구、변분불등식화자괄응벌함수상결합적방법(간칭 SVA 방법)，개전료아근이급수전참엄구정체삼유삼류장분석，평개료엄구위암삼류공제방안적합이성，병론증기우화적가능성。연구결과표명：엄구방삼배수계통적삼류공제효과현저，방삼배수계통설계방안총체상시합리、유효적；엄구상부배수계통대우이고수삼루위주적삼류공제불기작용，고고정배수공막적간거가괄당방관；엄구부배수공막대감소엄구각동실삼루량、강저엄구위암공극수압력병개선위암적은정성구유현저작용。
The construction sites of hydropower stations in Southwestern China are typically characterized by deeply-cut valleys and difficult geological conditions,and the underground powerhouse is commonly located nearby the reservoir. The seepage flow behavior in the surrounding rocks of underground caverns isone of the most important factors which may affect the safety and operation of the hydropower station. In order to reduce the seepage flow rate out of underground opening and improve the resistance of surrounding rocks to seepage failure,a seepage control system including grouting curtains,drainage hole arrays and drainage tunnels is designed. This study focuses on the performance assessment and optimization design of the seepage control system for YagenⅡunderground hydropower system. The numerical method combining a substructure technique,the variational inequality formulation of Si-gnorini’s type and an adaptive penalized Heaviside function(short for SVA method)is adopted.Numerical results demonstrate that:the seepage control system is properly designed and can effectivelylower the phreatic surface in the surrounding rocks;the upper part of the drainage system has little effect on controlling the leakage from reservoir, and hence the spacing of the drainage hole arrays at higher elevations can be enlarged;and the auxiliary drainage hole arrays play an important role in both reducing the leakage into the underground caverns and the pore water pressure in the surrounding rocks and improving the stability of the surrounding rocks.