CAJ | 학술논문

江坪河水电站右岸地下洞群依次布置为导流洞、泄洪放空洞、溢洪道①、溢洪道②四条隧洞，洞室密集，地质条件复杂。三维模型以洞室模拟为主，同时精确模拟了3个洞室出口边坡，4条较大断层，多个岩层分层及坡表的实际形态。洞室开挖后，采用预应力锚索、系统锚杆、初期衬砌和二期衬砌等多种支护措施。支护计算时，对预应力锚索进行了精细模拟。对系统锚杆采用二维“子模型”的进行等效计算，确保了必要的计算精度，提高了建模可行性和计算效率。两期衬砌模拟采用三维壳体结构单元中的 Shell 单元，通过2次位移等效分别得到考虑锚杆衬砌效应的修正后初期衬砌和二期衬砌变形参数。根据关键点的变形趋势及洞室的最大弯矩值的变化情况对衬砌厚度进行了优化。针对设计规范中衬砌结构配筋所需基础参数，指出利用衬砌单元可有效的读取衬砌弯矩值和剪力值，同时标定其具体位置。分析认为，泄洪洞开挖坡锚索和2条溢洪道之间的上层的对穿锚索可能由于水泥浆强度较低而出现滑移，同时指出加固措施使临空面的最大位移大幅降低，也能一定程度抑制塑性区发育。
강평하수전참우안지하동군의차포치위도류동、설홍방공동、일홍도①、일홍도②사조수동，동실밀집，지질조건복잡。삼유모형이동실모의위주，동시정학모의료3개동실출구변파，4조교대단층，다개암층분층급파표적실제형태。동실개알후，채용예응력묘색、계통묘간、초기츤체화이기츤체등다충지호조시。지호계산시，대예응력묘색진행료정세모의。대계통묘간채용이유“자모형”적진행등효계산，학보료필요적계산정도，제고료건모가행성화계산효솔。량기츤체모의채용삼유각체결구단원중적 Shell 단원，통과2차위이등효분별득도고필묘간츤체효응적수정후초기츤체화이기츤체변형삼수。근거관건점적변형추세급동실적최대만구치적변화정황대츤체후도진행료우화。침대설계규범중츤체결구배근소수기출삼수，지출이용츤체단원가유효적독취츤체만구치화전력치，동시표정기구체위치。분석인위，설홍동개알파묘색화2조일홍도지간적상층적대천묘색가능유우수니장강도교저이출현활이，동시지출가고조시사림공면적최대위이대폭강저，야능일정정도억제소성구발육。
Underground caverns of Jiangping River Hydropower Station arranged for the diversion tunnel, flood discharge tunnel, spillway No.1, spillway No.2 in turn, caverns of which are intensive, geological conditions are complex and constructions are difficult. The authors simulate caverns mainly in three-dimensional model; while simulate the three chambers slopes of the outlet, four large faults , the actual shape of a number of rock stratification and slope table accuratly. Prestressed anchor cable, anchor bolt and lining systems and other support measures are used in the project after excavation. The prestressed anchor bolt is simulated accuratly in supporting calculations. System of anchor bolts are simulated by using two-dimensional submodel for equivalent calculations. These measures ensure the necessary accuracy, but also improve the modeling and calculation efficiency. For the secondary lining simulation, the shell unit of three-dimensional shell structure is used to get revised deformation parameters of the initial lining and secondary lining considering the effect of anchor bolt lining through two displacement equivalent. Lining thickness has been optimized according to the deformation trends of the key points and the greatest moment change of cavern. Cavern bending moment and shear force value can be read though lining unit effectively. Bending and shear force values of lining structural of the most dangerous condition provide a reference for the reinforcement. The diagram of displacement values and the plastic zone map before and after the reinforcement are given in the calculation results. And the reinforcement measures significantly reduce the maximum displacements and the plastic zone.