CAJ | 학술논문

三峡库区侏罗系地层具有独特的软硬相间的岩性组合和结构特征，侏罗系砂泥岩软硬相间地层是该地区典型的易滑地层，是滑坡集中发育的地层之一，也是三峡库区滑坡防治工作中的重点区域。为深入研究软硬相间层状岩质边坡的稳定性，通过对理论概化模型的分析，构建了软硬相间顺层岩质边坡的参数劣化计算模型。考虑风化作用对岩体结构面抗剪强度参数劣化的影响，引入空间变异函数，提出软硬相间层状岩质边坡结构面抗剪强度参数劣化模型，导出软硬相间层状岩质边坡沿层面方向抗剪强度参数劣化的函数表达式，表征了分析点的风化影响厚度与其强度参数的一一对应关系，有利于边坡稳定性的定量分析。利用该函数表达式对沿层面方向岩体的强度参数进行劣化，利用劣化后的强度参数进行稳定性评价，得到分析点至坡面距离与该点稳定系数的对应关系曲线，并结合三峡库区边坡实例进行了验证分析，指出软硬相间层状岩质边坡岩体抗剪强度参数的劣化对其稳定性评价具有较大影响，单平面滑动的稳定分析中抗剪强度参数沿层面恒定分布的假定具有一定的局限性；若不考虑结构面抗剪强度参数的劣化，可能导致稳定性计算结果偏于不安全。
삼협고구주라계지층구유독특적연경상간적암성조합화결구특정，주라계사니암연경상간지층시해지구전형적역활지층，시활파집중발육적지층지일，야시삼협고구활파방치공작중적중점구역。위심입연구연경상간층상암질변파적은정성，통과대이론개화모형적분석，구건료연경상간순층암질변파적삼수열화계산모형。고필풍화작용대암체결구면항전강도삼수열화적영향，인입공간변이함수，제출연경상간층상암질변파결구면항전강도삼수열화모형，도출연경상간층상암질변파연층면방향항전강도삼수열화적함수표체식，표정료분석점적풍화영향후도여기강도삼수적일일대응관계，유리우변파은정성적정량분석。이용해함수표체식대연층면방향암체적강도삼수진행열화，이용열화후적강도삼수진행은정성평개，득도분석점지파면거리여해점은정계수적대응관계곡선，병결합삼협고구변파실례진행료험증분석，지출연경상간층상암질변파암체항전강도삼수적열화대기은정성평개구유교대영향，단평면활동적은정분석중항전강도삼수연층면항정분포적가정구유일정적국한성；약불고필결구면항전강도삼수적열화，가능도치은정성계산결과편우불안전。
The Jurassic sand-mudstone alternating stratum is one of typical sliding-prone layers in Three Gorges Reservoir region, where the landslides occur with high frequency. Due to this characteristic lithology combination and architectural feature, the stratum is one key area of landslide control in Three Gorges Reservoir region. In order to further study the stability of rock slope with soft-hard alternating layers, the paper presents a new calculation model of soft-hard interbedding rock slope by means of the analysis on an idealized model. Besides, a shear strength parameter degradation model of soft-hard interbedded rock slope is proposed with considering the effect of weathering for shear strength parameter degradation of the discontinuity plane and a space variation function. Moreover, function expression of shear strength parameter degradation is educed along surface of the layer. The function presented the relationship between weathering thickness and strength parameters, which was in favour of the quantitative analysis of slope stability. Then, utilizing this function weakened the shear strength parameters along surface, evaluating slope stability with the weakened parameters, obtaining the relation curve of stability coefficient and distance from the analyzed point to slope surface. Finally, it is proved that the shear strength parameter degradation of the discontinuity plane of soft-hard interbedded rock slope is significant to its stability assessment with slope case study in Three Gorges Reservoir region. It is concluded that the assumption that shear strength parameters remain constant distribution along layer surface has certain limitation in the stability analysis of single sliding surface slope. Moreover, if the degradation of shear strength parameters of structural planes is not under consideration, it may lead to the result of stability calculation unsafe.