The aim of this study is to develop a systematic approach for support design of weak rock drift based on empirical, analytical, and numerical method, which is employed to estimate weak rock support demand and design support system. Detailed engineering geological investigations and rock mechanics test have been carried out in weak rock drift. The Q-system and GSI-system were used to determine the primary support design and rock mass properties, respectively. The numerical model of RS2 finite element program has been calibrated by analyzing the relation of falling height observed in the field to the frictional angles obtained from empirical method, rock mechanics test, and calculated rock mass parameters, respectively. In an attempt to check the validity of sophisticated support, support suggested by Q-system, and the combination support system proposed by analytical approach, the RS2 program was employed to analyze the depth of plastic zone and total displacement surrounding the weak rock drift. Numerical results show that the depths of plastic zone and total deformation surrounding the weak rock drift supported by the combination support system significantly descended 87% and 90% of those of sophisticated support. In particular, the rock bolt and cable bolt provide enough frictional and interlocked forces to resist weak rock falling which change the weak rock mechanicals properties and the surface holding function reinforced by the shotcrete, wire mesh, and steel strap. The factor of safety (FOS) of 8.28 of the combination support system is much more than the FOS of 1.5 for permanent drift. The combination support system with rock bolts, cable bolt, shotcrete, wire mesh, and steel straps has been applied to stabilize the weak rock drift and found to be successful to prevent further deformations surrounding the drift.

中文翻译：

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基于系统方法的弱岩巷道支护设计分析

这项研究的目的是开发一种基于经验，分析和数值方法的软岩漂移支护设计系统方法，该方法可用于估算软岩支护需求和设计支护系统。在弱岩石漂移中已经进行了详细的工程地质调查和岩石力学测试。Q系统和GSI系统分别用于确定主要支护设计和岩体性质。通过分析现场观察到的下降高度与分别通过经验方法，岩石力学测试和计算出的岩体参数获得的摩擦角之间的关系，对RS2有限元程序的数值模型进行了校准。为了检查复杂支持的有效性，Q-system建议的支持，结合分析方法提出的组合支撑系统，采用RS2程序对塑性区的深度和弱岩巷周围的总位移进行分析。数值结果表明，组合支撑系统所支撑的弱岩巷周围塑性区和总变形的深度分别比复杂支撑的深度分别降低了87％和90％。特别是，岩石锚栓和缆索锚栓提供了足够的摩擦力和互锁力来抵抗弱岩石落下，从而改变了弱岩石力学性能以及由喷射混凝土，金属丝网和钢带加强的表面保持功能。组合支撑系统的安全系数（FOS）为8.28，远远超过永久漂移的1.5的FOS。带有岩石螺栓，电缆螺栓，