大型地下洞室群施工期快速反馈分析实用方法

Rapid feedback analysis method for underground caverns during construction

工程岩体是一个高度复杂的灰色系统,按理论方法或实测途径均难以完全确定岩石的基本参数。地下工程快速反馈分析方法是工程现场完善设计、优化施工的可靠方法。通过深入分析施工期围岩参数正反演过程,发现影响反演效果的关键因素为输入数据的真实性,计算模型的适应性和计算结果的可靠性。结合工程地质和监控量测特征,提出了用正交试验设计优化反演方案设计的方法;采用区间分析和分层优化的思想建立了不确定性力学参数的区间反分析优化方法,并给出了目标函数和技术路线。研究地下工程施工过程中多点位移计的布置原则和监测数据变化规律,指出了快速反馈分析方法在大型地下洞室群施工参数反演实践中的特点。通过针对性的反演分析可得到最优围岩参数值,用以优化工程设计和施工。

It is impossible to obtain complete field data in underground engineering;for example,information on stresses and properties.can only be partially known.The back-analysis is oriented toward using relatively little site-specific data to give the most help to geotechnical engineering.Key factors affecting back-analysis results were investigated in detail,especially the authenticity of input data,the adaptability of computation model and the reliability of the computation result.The orthogonal experimental method was used to performing a successful devise for numerical experiments.The layered range optimizing method was established to assemble uncertain problem-specific parameters.Considering the geological characteristics of underground engineering,the measurement data and the interval analysis method,the rapid feedback method for huge underground houses was established during construction.The spectrum of back-analysis was also presented.Analyzing the deformation law of underground engineering structures in process of construction,sufficient feedback experiments can produce relevant rock parameters,which help to optimized the subsequent engineering construction process.If enough data of a high quality are available,the feedback can give good predictions.