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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。
Due to the complex geological conditions, the dam foundation of Wudu gravity dam is developed with a variety of adverse geological formations such as faults and interlaminar fault zones. The structural planes are interlaced with each other to form a plurality of potential slip planes. The anti-sliding stability of deep dam foundation is outstanding. In order to study the effect of multi-structural surface on the anti-sliding stability of the deep foundation of dam foundation and the reinforcement treatment, a three-dimensional numerical model was established for finite element analysis combined with 19 # dam section of Wudu gravity dam. Firstly, the sensitivity analysis of the mechanical parameters of the weak foundation in the dam foundation is carried out to study the main factors that affect the stability of the dam foundation. It is revealed that the 10f2 and F31 faults downstream of the dam heel tend to greatly affect the anti-sliding stability of the dam foundation. deal with. On this basis, different depths of concrete replacement are formulated on the faults 10f2 and F31, and the sensitivity of the depth of the fault replacement concrete is analyzed. The safety factor of overloading under different displacement depths is obtained. The results show that the displacement of 10f2 and F31 at depth of about 19 m can be well reinforced and the displacements and stresses are well improved. The plastic zone of the dam foundation is significantly reduced, and the safety factor of anti-sliding stability is obviously improved. The design code Claim. The research results provide an important scientific basis for the strengthening treatment of the Wudi gravity dam project, which is of reference value for the stability analysis and reinforcement of similar projects.