CAJ | 학술논문

武都重力坝坝基地质条件复杂，发育有断层、层间错动带等多种不利地质构造，且结构面相互交错组合形成多条潜在滑移面，坝基深层抗滑稳定问题突出。为了研究多结构面对坝基深层抗滑稳定的影响及加固处理，结合武都重力坝19#坝段，建立了三维数值模型进行有限元分析。首先，对坝基中各软弱结构面的力学参数进行敏感性分析，研究影响坝基稳定的主要因素，揭示了坝踵处倾向下游的10f2、F31断层对坝基抗滑稳定影响较大，应进行重点加固处理。在该基础上，在断层10f2、F31拟定不同深度的混凝土置换，对断层置换混凝土的深度进行敏感性分析，得出不同置换深度下坝基的超载稳定安全系数。结果表明，断层10f2、F31的置换深约19 m 时可以达到良好的加固效果，位移和应力值得到良好的改善，坝基塑性区域明显减小，抗滑稳定安全系数得到明显提高，并满足设计规范要求。研究成果对武都重力坝工程的加固处理提供了重要的科学依据，对类似工程的稳定分析与加固处理具有参考价值。
무도중력패패기지질조건복잡，발육유단층、층간착동대등다충불리지질구조，차결구면상호교착조합형성다조잠재활이면，패기심층항활은정문제돌출。위료연구다결구면대패기심층항활은정적영향급가고처리，결합무도중력패19#패단，건립료삼유수치모형진행유한원분석。수선，대패기중각연약결구면적역학삼수진행민감성분석，연구영향패기은정적주요인소，게시료패종처경향하유적10f2、F31단층대패기항활은정영향교대，응진행중점가고처리。재해기출상，재단층10f2、F31의정불동심도적혼응토치환，대단층치환혼응토적심도진행민감성분석，득출불동치환심도하패기적초재은정안전계수。결과표명，단층10f2、F31적치환심약19 m 시가이체도량호적가고효과，위이화응력치득도량호적개선，패기소성구역명현감소，항활은정안전계수득도명현제고，병만족설계규범요구。연구성과대무도중력패공정적가고처리제공료중요적과학의거，대유사공정적은정분석여가고처리구유삼고개치。
Foundation of Wudu gravity dam has the complex geological conditions, developed many adverse geological structures including faults and interbed shear zones. The stability of dam foundation is very serious due to the potential natural sliding paths formed by these interlaced planes. In order to study the impacts of multi-structural planes on foundation stability and reinforcement measures, a 3D numerical computation is conducted to analyze the typical dam section #19 of Wudu project by means of finite element method(FEM). First, the sensibility analysis is performed to study the impacts of various weak structural planes on stability. It reveals that the dam stability is severely affected by faults 10f2 and F31 incline downstream from dam heel, and the reinforcement measures should be taken and focus on the faults 10f2 and F31. On this basis, another sensibility analysis of concrete replacement depth is also conducted. Through varying the concrete replacement depths for faults 10f2 and F31, the corresponding safety factors are obtained. Results show that the reasonable replacement depth for faults 10f2 and F31 is about 19 m which can achieve favorable reinforcement effect; deformation and stress of dam have been improved; plasticity states of the dam foundation has been significantly reduced; the safety factor of anti-sliding stability is significantly improved; and the requirement of design specification is satisfied simultaneously. These research results provide an important scientific basis for the reinforcement of Wudu project, and also have the reference value for the stability analysis and reinforcement treatment of other similar projects.