隧洞开挖过程中围岩安全系数演化特征与支护时机选择方法研究

doi:10.13722/j.cnki.jrme.2018.1260

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摘要通过数值模拟，提出一种确定初次支护施作时机的新方法。引入点安全系数评价监测断面开挖边界各点的稳定性，定义所有监测点的点安全系数的几何平均值为整体安全系数，用以评价该断面的整体稳定性，避免选择少数监测点带来的结果特异性。建立围岩整体安全系数与监测断面相对掌子面距离之间的对应关系，一旦围岩整体安全系数降低至允许值，则认为围岩稳定性进入临界状态，对应的相对掌子面位置即为推荐初期支护的施作位置。通过这一方法，可针对某一典型断面，快速确定其初期支护的施作时机，在施工中做到及时反馈。同时，结合不同岩性和地应力条件方案的计算结果，表明了所提出的支护时机选择方法具有较好的规律性，以期为实际工程提供参考。

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	苏凯
	张妍珺
	伍鹤皋
	周利

关键词 ：隧道工程, 开挖, 安全系数, 围岩稳定, 支护时机

Abstract：A novel methodology is proposed to determine the timing of initial support installation via the numerical simulation by FLAC3D. The point safety factor is introduced to evaluate the stability of each rock zone on the excavation boundary. And the geometric mean of all point safety factors is defined as the global safety factor to evaluate the overall stability，which avoids selecting limited and specific monitoring points. Then，the comprehensive graphic relationship between global safety factor and distance to tunnel face is established. Once global safety factor decreases to an admissible value，the stability of surrounding rock is in critical state and the corresponding distance in graphic relationship is the recommended location for installing initial support. In these procedures，the installation time of initial support at the typical tunnel section can be quickly designed and fed back during construction，which is efficient and effective. Meanwhile，several cases with different conditions have been carried out to validate the regularity of the method.

Key words： tunnelling engineering excavation safety factor rock mass stability support installation time

引用本文:

苏凯，张妍珺，伍鹤皋，周利. 隧洞开挖过程中围岩安全系数演化特征与支护时机选择方法研究[J]. 岩石力学与工程学报, 2019, 38(S1): 2964-2975.
SU Kai，ZHANG Yanjun，WU Hegao，ZHOU Li. Evolution of surrounding rock safety factor and support installation time during tunnel excavation. , 2019, 38(S1): 2964-2975.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1260 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2964

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