CAJ | 학술논문

在库水的长期浸泡-风干循环作用下，库岸边坡岩体的动力特性变化规律直接影响其长期稳定性能，其中，消落带是库岸边坡稳定的敏感地带。因此，特选取三峡库区库岸边坡消落带典型砂岩为研究对象，设计了考虑水压力反复升降变化和浸泡-风干循环耦合作用的试验方案，对不同浸泡-风干循环作用周期的岩样进行单轴循环加、卸载动力响应试验。研究结果表明：随着浸泡-风干循环作用次数的增加，相同次数加、卸载循环作用时对应岩样的轴向应变、动应力-应变曲线的滞回圈面积逐渐增大，计算得到砂岩的阻尼系数、阻尼比逐渐变大，动弹性模量逐渐减小，说明浸泡-风干循环作用对砂岩动力特性的损伤是一种累积性发展的过程。最后，基于岩样的微观结构变化，对浸泡-风干水岩循环作用下砂岩动力特性劣化机制进行探讨。研究成果对库区大量存在的库岸边坡在考虑地震作用下的长期稳定性评价具有较高的参考价值。
재고수적장기침포-풍간순배작용하，고안변파암체적동력특성변화규률직접영향기장기은정성능，기중，소락대시고안변파은정적민감지대。인차，특선취삼협고구고안변파소락대전형사암위연구대상，설계료고필수압력반복승강변화화침포-풍간순배우합작용적시험방안，대불동침포-풍간순배작용주기적암양진행단축순배가、사재동력향응시험。연구결과표명：수착침포-풍간순배작용차수적증가，상동차수가、사재순배작용시대응암양적축향응변、동응력-응변곡선적체회권면적축점증대，계산득도사암적조니계수、조니비축점변대，동탄성모량축점감소，설명침포-풍간순배작용대사암동력특성적손상시일충루적성발전적과정。최후，기우암양적미관결구변화，대침포-풍간수암순배작용하사암동력특성열화궤제진행탐토。연구성과대고구대량존재적고안변파재고필지진작용하적장기은정성평개구유교고적삼고개치。
Under the condition of long-term cyclic saturation-air drying, long-term stability of reservoir bank slopes are affected by their dynamic characteristics change rules, and the hydro-fluctuation belt is the sensitive area. Thereafter, taking typical sandstone in the hydro-fluctuation belt of reservoir bank in Three Gorges reservoir area, a test scheme is designed with the consideration of coupling interaction of water pressure changes and saturation-air dry cyclic function, and uniaxial cyclic loading and unloading dynamic response tests of sandstone with different saturation-air dry cycle periods are carried out. The experimental results show that the hysteresis loop area of dynamic stress-strain curve and axial strain of the sandstone samples increase gradually when they experience the same times cyclic loading and unloading, and the dynamic elastic modulus of sandstone samples decrease gradually and damping coefficient, damping ratio increases gradually during the saturation-air dry cyclic process, which indicates that the saturation-air dry cyclic function has a cumulative damage of dynamic characteristics on the samples. Finally, degradation mechanisms of dynamic characteristics under the saturation-air dry cyclic function are discussed in detail based on the microscopic structure change of sandstones. Research results have an important reference for the long-term stability analysis of reservoir bank slopes considering the earthquake action.