Strength Degradation Mechanism of Soft and Hard Interbedded Rock Masses of Badong Formation Caused by Rock/Discontinuity Degradation
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摘要: 岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制是揭示三峡库区库岸消落带巴东组软硬互层岩体强度渐进劣化机理和评价库岸边坡稳定性的关键问题.以三峡库区典型"易滑岩组"巴东组第二段红色系列的砂岩与粉砂质泥岩互层岩组为研究对象，考虑干湿循环条件下岩石/结构面参数劣化，开展了软硬互层岩体单轴压缩数值试验，分析了软岩/硬岩/层面劣化对巴东组软硬互层岩体单轴压缩强度劣化的贡献度及其与岩层倾角的关系.研究结果表明，不同岩层倾角条件下，软岩/硬岩/层面劣化对巴东组软硬互层岩体单轴压缩强度劣化的影响有明显区别，以软岩/硬岩/层面劣化对巴东组软硬互层岩体单轴压缩强度劣化的贡献度为依据，将岩层倾角全范围划分为软岩控制区、软岩-硬岩-层面共同控制区、沿层面滑移失稳破坏区和硬岩控制区，揭示了岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制及其受岩层倾角的影响，为进一步研究库岸消落带巴东组软硬互层岩体强度渐进劣化机理奠定了基础.Abstract: Strength degradation mechanism of soft and hard interbedded rock mass of Badong Formation caused by rock/discontinuity degradation is the key issue to reveal progressive strength deterioration mechanism of soft and hard interbedded rock mass of Badong Formation in hydro-fluctuation belt of reservoir bank and to evaluate the stability of reservoir bank slope in the Three Gorges area. Sandstone and silty mudstone of the typical sliding-prone soft and hard interbedded rock masses of Badong Formation in the Three Gorges area were taken as the research object to conduct uniaxial compression numerical test, considering the deterioration of rock/discontinuity parameters under the condition of drying-wetting cycle, the contribution of soft rock/hard rock/bedding plane degradation to the uniaxial compression strength degradation of soft and hard interbedded rock masses in the Badong Formation and its relationship with the dip angle are analyzed. The results indicate that the influence of soft rock/hard rock/bedding plane deterioration on the uniaxial compression strength degradation of soft and hard interbedded rock mass in the Badong Formation has obvious difference under different dip angles. The dip angle is divided into soft rock control zone, soft rock-hard rock-bedding plane common control zone, slip failure zone along the bedding plane and hard rock control zone based on their contribution. The results reveal the mechanism of strength degradation of soft and hard interbedded rock mass caused by rock/discontinuity deterioration and the influence of dip angle, which provides the basis for revealing the progressive strength deterioration mechanism of soft and hard interbedded rock masses of the Badong Formation in hydro-fluctuation belt of reservoir bank.
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图 1 巴东组典型软硬互层岩组
Fig. 1. Typical soft and hard interbedded rock masses in Badong Formation
图 3 不同干湿循环次数下巴东组软硬互层岩体模型应力-应变曲线（0°倾角）
Fig. 3. Stress-strain curves of the soft and hard interbedded rock masses in Badong Formation under different drying-wetting cycles(β=0°)
图 4 巴东组软硬互层岩体的初始单轴压缩强度随岩层倾角的变化曲线
Fig. 4. Initial uniaxial compressive strength of the soft and hard interbedded rock mass in Badong Formation under different dip angles
图 5 不同岩层倾角条件下软岩/硬岩/层面劣化对巴东组软硬互层岩体强度劣化的影响规律
a. 0°岩层倾角；b. 10°岩层倾角；c.24°岩层倾角；d. 26°岩层倾角；e.80°岩层倾角；f. 90°岩层倾角
Fig. 5. Effect of soft rock/hard rock/bedding plane deterioration on the strength deterioration of soft and hard interbedded rock masses in Badong Formation under different dip angles
图 6 单轴压缩条件下巴东组软硬互层岩体（0°倾角）
塑性破坏区分布图
Fig. 6. Distribution of plastic failure zone of soft and hard interbedded rock masses in Badong Formation under uniaxial compression(β=0°)
图 7 单轴压缩条件下巴东组软硬互层岩体（24°倾角）
塑性破坏区分布图.a.干湿循环初期（n≤7）；b.干湿循环后期(n > 7)
Fig. 7. Distribution of plastic failure zone of soft and hard interbedded rock masses in Badong Formation under uniaxial compression(β=24°)
图 8 单轴压缩条件下巴东组软硬互层岩体（90°倾角）
塑性破坏区分布图
Fig. 8. Distribution of plastic failure zone of soft and hard interbedded rock masses in Badong Formation under uniaxial compression(β=90°)
图 9 巴东组软硬互层岩体强度劣化主控因素（岩石/结构面劣化）与岩层倾角的关系分区
Fig. 9. Zoning diagram of the relationship between the main controlling factors (rock/discontinuity degradation) of strength deterioration and the dip angles of soft and hard interbedded rock masses in Badong Formation
表 1 不同干湿循环次数下巴东组粉砂质泥岩/砂岩/层面强度参数值
Table 1. Strength parameters of silty mudstone/sandstone/bedding plane in Badong Formation under different drying-wetting cycles
干湿循环
0次干湿循环
1次干湿循环
3次干湿循环
5次干湿循环
7次干湿循环
10次干湿循环
15次粉砂质泥岩 粘聚力（MPa） 2.28 1.17 0.79 0.67 0.59 0.50 0.39 内摩擦角（°） 34.8 28.8 19.4 16.6 15.4 14.9 14.6 抗拉强度（MPa） 1.44 1.35 1.15 0.47 0.25 0.12 0.03 砂岩 粘聚力(MPa) 10.1 6.35 4.99 4.26 3.75 3.19 2.52 内摩擦角（°） 45.1 44.3 41.4 39.7 38.5 37.3 35.9 抗拉强度(MPa) 5.99 3.46 2.71 2.31 2.04 1.74 1.38 层面 粘聚力(MPa) 0.045 0.040 0.028 0.023 0.021 0.019 0.016 内摩擦角（°） 27.0 26.5 25.7 24.9 24.1 23.2 22.1 
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表 2 不同岩层倾角条件下软岩/硬岩/层面劣化对巴东组软硬互层岩体强度劣化的贡献度
Table 2. The contribution of soft rock/hard rock/bedding plane degradation to the strength degradation of soft and hard interbedded rock masses in the Badong Formation under different dip angles
岩层倾角（°） 干湿循环15次后岩体强度劣化率d(%) 岩石/层面劣化对岩体强度劣化的贡献度 软岩贡献度Cs(%) 硬岩贡献度Ch(%) 层面贡献度Cb(%) 软岩控制区 0 88.11 56.06 43.78 0.17 10 90.31 56.91 42.95 0.14 20 85.57 60.11 39.19 0.70 22 83.46 65.05 34.95 0.00 软岩-硬岩-层面共同控制区 23 84.24 53.88 36.40 9.72 24 84.64 50.60 23.52 25.88 25 84.39 53.16 17.08 29.75 26 80.93 42.10 22.65 35.25 27 80.53 42.38 19.14 38.47 沿层面滑移失稳破坏区 28 0.00 / / / 77 13.41 / / / 硬岩控制区 78 26.99 0.26 97.83 1.92 80 33.00 0.42 96.73 2.85 85 66.75 0.45 99.21 0.34 90 75.17 25.64 74.07 0.29 注：“/”代表该区间岩体单轴压缩强度劣化可忽略不计，故无需计算软岩/硬岩/层面劣化贡献度.
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