松散围岩强化支护技术研究及其可靠性分析

松散围岩支护结构及其稳定性问题是国内外岩石力学难点之一，其稳定性影响因素的随机性强，造成稳定性评价及分析不精确，工程应用上容易出现塌方事故。因此，松散围岩巷道支护结构的正确选取及合理的理论论证非常必要。结合某矿实验巷道采用的强化支护形式，用压缩拱及主次承载区作用理念来论证松散体中锚杆支护结构的作用，并根据物理和力学参数的不确定性，建立可靠度分析方程，分析强化支护实验巷道的破坏概率。现场观测表明强化支护技术有效地控制了松散围岩的变形，进一步验证了理论计算的可靠性。

Research on Enhanced Support Technique for Loose Wall Rock and Its Reliability Analysis

The support structure for loose wall rock and its stability are among of the challenges in rock mechanics both in and outside China. The great randomness of its stability influencing factors can lead to the inaccuracy of the evaluation and analysis of stability and to the easy occurrence of collapse accidents in engineering. Therefore, the correct selection of the support structure for the laneway with loose wall rock and the reasonable theoretical demonstration are very essential. Taking a support form adopted in a test laneway in a mine, the function of bolt support structure in loose rock mass was demonstrated using the theory of compressed arch and the coordination action between the primary and secondary supporting zones. The equation for reliability analysis was established taking into consideration of the uncertainness of physical and mechanical parameters, which was then used to analyze the destruction probability of the test laneway adopting the enhanced support. Locale observation demonstrates that the enhanced support technique has effectively controlled the deformation of loose wall rock, thus further verifying the reliability of the theoretical calculation.