Three-dimensional modeling technology is key to the numerical analysis of the stability of large irregular cavern groups using Flac3D. Based on the multiple soft coupling technique, the rapid modeling of the complex irregular caverns of Changyu in Wenling of the Zhejiang Province is realized by comprehensive use of AutoCAD, Surpac, Surfer and Matlab programs under the condition of only using the main parameters of the cavern structure, such as the topographic map, center coordinate of the cavern bottom, tunnel height and tunnel span. A model that is 624 m long, 480 m wide, 336 m high and has 6 irregular caverns is modeled with 16 m, 8 m, 4 m, and 2 m sized grids. Under the accuracy requirements, the calculation is completed in only 2.5 hours, improving the calculation speed greatly. The calculation and analysis show the cavern group is stable, but the force state of the surrounding rock at the bottom and the central diaphragm wall is not conducive to stability. Traditionally, there are three kinds of measures for enhancing the stability of the cavern structure during cavern excavation:partial removal of the surrounding rock at the bottom, storing water in the rock pit and partial removal of the rock mass at the central diaphragm.%三维建模技术是采用Flac3D进行大型不规则洞室群稳定性数值分析的关键,文章基于多软件耦合技术,综合采用AutoCAD、Surpac、Surfer、Matlab自编程序,仅依靠地形图、洞室底部中心坐标、洞室高度、洞室跨度等洞室结构主要参数,实现了复杂不规则洞室群的快速建模.同时采用16m、8m、4m、2m四种网格尺寸,对长624m、宽480 m、高336 m且内部分布6个不规则洞室的地层模型进行了建模,在保证计算精度的前提下,2.5 h即完成了计算,大大提高了计算速度.计算与分析结果表明,本文所研究的洞室群处于稳定状态,但洞室底部围岩和中隔墙受力状态不利于稳定.为此,古人在开凿洞室过程中,采取了挖除洞室底部分围岩、在岩坑内蓄水、挖除中隔墙部分岩体等3项措施,以增强洞室结构稳定性.
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