中文摘要：

针对白鹤滩大型水电站揭露的错动带，探索了一种反映原岩应力状态的错动带试样制备方法，采用替代法对错动带进行超粒径处理，同时控制先期固结压力和稳压时间进行静载固结，并基于不同先期固结压力、不同高围压下的不固结、不排水三轴试验，结合矿物成分分析试验和扫描电镜试验，分析了不同先期固结压力下错动带的力学和变形特性。试验结果表明，不同高围压、不同固结压力下错动带应力一应变关系曲线基本表现为有剪胀行为的应变硬化型力学行为，且多为腰鼓型塑性破坏；在相同固结压力条件下，随着围压升高，错动带试样破坏应力、变形模量和泊松比均呈增大趋势，扩容效应更明显；相同围压条件下，随着先期固结压力的增大，错动带破坏应力逐步提高，弹性模量逐渐增大，而泊松比略有减小，敏感性不大；同时黏聚力和内摩擦角随固结压力的增加而分别减小和增大，呈劣化趋势。错动带微观结构的定性和定量分析进一步揭示了错动带作为一种夹杂错动后残留有岩石碎屑（块）软弱物质的颗粒类材料，在高应力下其塑性变形主要来源于颗粒破碎和颗粒的定向排列。因此，先期固结压力是影响错动带性质的重要因素。

英文摘要：

For interlayer staggered zones revealed in Baihetan large-scale hydropower station, a preparation method of reconstituted specimens is explored to reflect in-situ stress of these zones with an alternative method of super particle processing. Meanwhile, the pre-consolidation pressure and consolidation time are controlled by the static loading. Based on unconsolidated and undrained triaxial tests on reconstituted specimens from the interlayer staggered zone under either different pre-consolidation pressures or different high confining pressures, in combination with tests of mineral composition analysis and scanning electron microscopy （SEM）. The mechanical deformation characteristics of interlayer staggered zones under different pre-consolidation pressures are discussed in detail. Under different confining and pre-consolidation pressures, deviatoric stress-axial strain curves of interlayer staggered zones reconstituted specimens exhibit strain hardening, and the plastic failure shows as the waist-drum shape. Under the same pre-consolidation pressure conditions, the failure stress, deformation modulus and Poisson＇s ratio increase with the increase of confining pressure, and the expansion effect is highly obvious. However, under the same confining pressure, the failure stress, deformation modulus and Poisson＇s ratio gradually increase with the increase of pre-consolidation pressure, while the Poisson＇s ratio decreases slightly. The cohesion decreases and the internal friction angle increases respectively, with consolidation pressure enhancing. The qualitative and quantitative microstructure analysis further reveal that the plastic deformation of the interlayer staggered zone, as rock materials containning fragments, mainly resulted from particle breakage and directional arrangement under high stress. Therefore, the pre-consolidation pressure is an important factor affecting the characteristics of the interlayer staggered zone.