中文摘要：

掌子面灾变行为、碎屑流运动发展规律、围岩稳定控制是碎屑流隧道修建过程中关键科学问题。结合祁连山的碎屑流地层构造，自主研制“碎屑流发生”的模拟试验装置，“再现”碎屑流发生过程、形成条件，揭示碎屑流发生、发展规律，并分析碎屑流的发生的影响因素。通过正交试验，探讨水头高度、碎屑流重度、埋深、物质组成等因素对碎屑流发生的影响，探明水持续性作用下掌子面失稳模式，提出掌子面稳定性判释指标。并根据模型试验结果对洞室碎屑流形成条件、物质结构组成、地下水和隧道开挖断面进行系统分析。研究成果为碎屑流地层围岩稳定控制机制、碎屑流隧道灾害控制以及隧道修建技术提供理论依据。

英文摘要：

The catastrophic behavior of working face,the movement and development of debris flow,the stability control of the surrounding rock mass are the key scientific issues of tunnel construction in the debris flow strata. A test device capable of simulating the geological structural features of Qilianshan tunnel were developed for investigating the occurrence,the development and the mechanism of catastrophe of debris flow. A program of orthogonal tests was carried out to study the effects of the water pressure,the debris gravity and burial depths of debris strata,material compositions on the occurrence of debris flow. The instability model of tunnel face and the stability identification index of tunnel face under the lasting action of water pressure were investigated. The conditions of strata formation of debris flow such as the material structure,the groundwater and the tunnel excavation section were analyzed systematically according to the results of the model tests.