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本文以循环网络技术为基本技术手段，结合地下洞室群的施工特点和经验，在借鉴过去研究的经验和成果的基础上，深入进行了地下洞室群施工时空的随机模拟研究。编制了 CSS和 CSSCQ程序，该程序较以往更好地反映施工实际。这在运用于小湾水电站地下厂房洞室群施工模拟，进行了施工方案优选，并为其施工程序的优化提出了一些良好的建议。
In this paper, we take the cyclic network technology as the basic technical means. Based on the construction characteristics and experience of the underground caverns, based on the experience and achievements of the past research, the stochastic simulation of the space-time of the underground caverns is deeply studied. A CSS and CSSCQ program has been prepared that reflects the actual construction better than ever before. This is used in the construction of the underground cavern group of Xiaowan Hydropower Station. The construction scheme is optimized, and some good suggestions are put forward for the optimization of the construction procedure.