大型地下洞室多层耦合应力超前解除法施工数值模拟

NUMERICAL MODELING ANALYSIS OF THE CONSTRUCTION METHOD WITH SEVERAL LAYERS EXCAVATING AND STRESS DISCHARGING IN ADVANCE FOR LARGE UNDERGROUND CAVITY

研究目的:针对海南工程地下厂房洞室施工项目的工期紧、施工通道受限的问题,本文提出了采用多层耦合应力超前解除法施工技术来克服这一难题。研究方法:由于该施工技术缺乏经验,为了保障施工的顺利进行本文运用大型通用有限元数值分析软件 (ANSYS)模拟计算了大断面地下洞室多层耦合应力超前解除的开挖过程,对其进行了非线性数值模拟分析,以确保洞室围岩在开挖过程中处于稳定状态,对薄弱环节进行及时加固,进而做出了该施工方法的可行性评价。研究结果:通过对监测报告资料与数值分析结果的比较分析,核准了该评价的正确合理性,同时与传统的分层逆做法施工技术对围岩的影响程度进行对比分析,充分证明了多层耦合施工方法的优越性。研究结论:从理论上证明了应力超前解除法是可行的,在诸多方面毫不逊色于传统的分层逆做法,为地下大型洞室快速施工提供了一种有效的施工方法。

Research purpose： In view of the problem of construction time limited and the construction passage limited of underground factory house for Hainan construction project, we bring up a new construction technology-several layers excavating and stress discharging in advance to solve this difficult problem. Research method： Ther is less experience of this construction technology. In order to guarantee the construction smoothly to carry on, this paper calculated with ANSYS software simulatedly the excavating process of several layers excavating and stress discharging in advance for big cross-section of underground factory house, analyzed the nonlinear numerical model to ensure the surrounding rock mass in stable condition and to reinforce the weak area in time and gave the doable estimate to this construction method. Research result： Through comparing and analyzing the monitoring information with numerical result, the paper approved this estimate was right and reasonable. At the same, comparing with traditional construction method of layer by layer excavating, it also approved the construction method of several layers excavating had its advantage. Research this new conclusion： method is construction method The paper proved theoretically that the construction better for the than traditional method of layer by layer big underground cavities fast excavation. method is doable. In many aspects, excavating and provides an effective