Research on Stability for the Surrounding Rock of Underground Excavations in Different Yield Criteria

2010 Second International Conference on Computer Engineering and Applications Pub Date : 2010-03-19 DOI:10.1109/ICCEA.2010.131

Chunhe Wang

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Abstract

According to the failure characteristics of surrounding rock after excavation, the indexes, such as the influence degree of the shear, tension crack, compression failure, unloading, disturbance and so on, are proposed to evaluate the failure characteristics. These indexes can not only describe reasonably the different failure characteristics of surrounding rock mass of underground opening under excavation, but also effectively reflect the destruction causes of cracking, unloading, stress concentration and disturbance accumulation of surrounding rock. So, a good quantitative basis of the stability evaluation is provided in excavation of underground chambers and tunnels. The excavation process of Laxiwa Underground Powerhouse is analyzed in this paper with three plastic yield criteria : D - P, M - C and Z - P yield criteria. The influences of different yield criteria to the stability of surrounding rock are verified based on the indexes of surrounding rock failure. At last, the rationality of different yield criteria adopted in respect to different lithology is demonstrated according to the comparison of monitoring data in construction and excavation.

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不同屈服准则下地下基坑围岩稳定性研究

根据开挖后围岩的破坏特征，提出了剪切、拉裂、压缩破坏、卸荷、扰动等影响程度的指标来评价开挖后围岩的破坏特征。这些指标不仅能合理描述开挖作用下地下巷道围岩的不同破坏特征，而且能有效反映围岩的开裂、卸荷、应力集中和扰动积累等破坏原因。为地下硐室及隧道开挖稳定性评价提供了定量依据。本文采用D - P、M - C和Z - P三种塑性屈服准则对拉西瓦地下厂房的开挖过程进行了分析。基于围岩破坏指标，验证了不同屈服准则对围岩稳定性的影响。最后，通过施工与开挖监测数据的对比，论证了针对不同岩性采用不同屈服准则的合理性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 Second International Conference on Computer Engineering and Applications

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