Highway photovoltaic slopes have been treated as an emerging application. To investigate their stability and improve the computational efficiency of three-dimensional models, a study was conducted based on the associated flow rule and a three-dimensional photovoltaic-slope model was developed in FLAC3D. An improved strength reduction method (SRM) was proposed, and the integration and optimization of stress-field application, timestep upper limits, and strength-reduction factors were implemented using Python to substantially accelerate the calculation of the safety factor (FS). The effectiveness of the proposed method was verified by means of a field photovoltaic-slope case. On this basis, the sensitivity of FS to single-factor influences (cohesion, internal friction angle, slope ratio, photovoltaic pile length, and photovoltaic structure position) and to multi-factor coupling effects was analyzed. The results indicate that the improved SRM can markedly enhance computational efficiency while preserving calculation accuracy, and that the installation of photovoltaic power systems on slopes exerts limited influence on slope stability, thereby demonstrating the feasibility of large-scale deployment of photovoltaic slopes.
鉴于上述问题,现提出一种基于FLAC3D及其内嵌Python接口的改进版强度折减法。该方法在遵循关联流动准则[22]的框架下,针对初始应力场加载策略、迭代时步上限以及强度折减系数的更新机制进行协同优化。通过一次性加载并复用初始应力场,以更精细且计算友好的方式调控时步上限,并在折减过程中采用更高效的增量策略,该方法在保证计算精度的前提下可显著提升三维SRM的计算效率。为验证方法的工程适用性,改进版强度折减法被应用于一典型高速公路光伏边坡工程案例,并与FLAC3D内置SRM计算结果进行对比分析。基于该工程模型,进一步开展单因素与多因素耦合的敏感性研究,以评估土体参数与光伏结构参数对边坡安全系数(factor of safety,FS)的敏感性程度。分析结果验证光伏发电系统在边坡上应用的可行性,可为类似工程提供参考价值。
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