富水弱胶结软岩地层锚杆（索）支护可锚性差、锚固力低且易失效致灾，锚固界面力学强度弱化特性及渐进失效机理仍不明确，是此类地层巷道围岩控制面临的关键科学问题之一。本项目首先开展富水条件锚固界面单元剪切试验，利用数字照相量测技术，从细观力学角度揭示不同含水率下弱胶结软岩锚固界面失效过程应变局部剪切流动规律及峰值（后）强度弱化特性；基于弹塑性损伤理论，提出界面失效临界强度判据，建立可描述界面剪胀硬化-软化特性的渐进损伤演化本构模型，并嵌入现有数值软件；考虑不同浸水环境、锚固参数及围岩应力影响，开展宏观锚固失效模拟试验与数值试验，构建锚固体三维力学模型，对锚固渐进失效过程进行全历程分析，研究锚固荷载传递规律，揭示界面渐进失效应力传递机理，提出此类条件锚杆（索）锚固力动态分析方法及安全合理锚固参数建议值。研究成果可为我国西部矿区弱胶结软岩地层锚固支护设计及大变形、塌方等灾害控制提供理论依据。

It is a common phenomenon that the bolt or cable presents poor boltability, low anchoring force and is prone to induce disasters in weakly cemented soft rock stratum under water-enriched condition. Nevertheless, the fundamental understanding of the weakening characteristics and progressive failure mechanism for anchorage interface in such stratum remains elusive, which is one of the key problems of stability control of roadway surrounding rock. Firstly, the anchorage interface unit shear test under water-enriched condition will be conducted. The local shear flowing law and the peak (or post) strength weakening characteristics in interface failure process, under varying water content of weakly cemented soft rock, will be revealed from the viewpoint of mesomechanics by using Digital Photogrammetry & Deformation Measurement Technique. Secondly, based on the elastoplastic damage theory, the critical strength criteria of interfacial failure, and the progressive damage evolution constitutive model will be proposed. The constitutive model, considering the interface characteristics of shear dilative hardening and softening, will be embedded in existing numerical software. Thirdly, considering the effects of different submerged environments, anchoring parameters and surrounding rock stress, the macroscopic anchorage failure simulation test and numerical test will be conducted, and a three-dimensional mechanical model of anchorage body will be constructed. Then the whole progressive failure process of anchorage interface will be analyzed, and the law of anchoring load transfer will be studied. By doing so, the interfacial progressive failure stress transfer mechanism will be discerned. Furthermore, the dynamic analysis method of anchoring force, the safe and rational suggested anchoring parameters, will be also proposed for bolt or cable under such condition. This research serves to provide theoretical basis for the design of anchoring support and control of disasters such as large deformation or collapse in weakly cemented soft rock stratum of western coal mining region in China.