Geoscience ›› 2017, Vol. 31 ›› Issue (05): 943-955.
• Research on the Main Geohazards and Engineering Geological Problems Along the SichuanTibet Railway • Previous Articles Next Articles
GUO Changbao1,2(
), ZHOU Jiazuo3,4, LIU Xiaoyi1, REN Sanshao1, WU Rui’an1
Received:2016-10-12
Revised:2017-06-10
Online:2017-10-10
Published:2017-11-06
CLC Number:
GUO Changbao, ZHOU Jiazuo, LIU Xiaoyi, REN Sanshao, WU Rui’an. Research on the Weakening Mechanism of the Mechanical Behavior for the Granite in the Eastern Qinghai-Tibet Plateau Under the Condition of Freezing-Thawing Cycles[J]. Geoscience, 2017, 31(05): 943-955.
Fig.1 Granite freezing and weathering characteristics in the east margin of the Qinghai-Tibet Plateau
| 序号 | 样品 编号 | 采样 地点 | 标准试样 件数/个 | 比重 | 干密度/ (g/cm3) | 含水 率/% | 孔隙 率/% |
|---|---|---|---|---|---|---|---|
| 1 | CX73-1 | 四川理塘 毛垭坝盆 地乱石包 滑坡 | 14 | 2.79 | 2.58 | 1.7 | 4.5 |
| 2 | CX73-2 | 14 | |||||
| 3 | CX73-3 | 4 | |||||
| 4 | CX73-4 | 7 | |||||
| 5 | XZ22-1 | 西藏八宿 县冷曲左 岸花岗岩 高斜坡 | 10 | 2.78 | 2.66 | 0.7 | 1.9 |
| 6 | XZ22-2 | 10 | |||||
| 7 | XZ22-3 | 10 | |||||
| 8 | XZ22-4 | 25 |
Table 1 Basic physical index of testing granite samples
| 序号 | 样品 编号 | 采样 地点 | 标准试样 件数/个 | 比重 | 干密度/ (g/cm3) | 含水 率/% | 孔隙 率/% |
|---|---|---|---|---|---|---|---|
| 1 | CX73-1 | 四川理塘 毛垭坝盆 地乱石包 滑坡 | 14 | 2.79 | 2.58 | 1.7 | 4.5 |
| 2 | CX73-2 | 14 | |||||
| 3 | CX73-3 | 4 | |||||
| 4 | CX73-4 | 7 | |||||
| 5 | XZ22-1 | 西藏八宿 县冷曲左 岸花岗岩 高斜坡 | 10 | 2.78 | 2.66 | 0.7 | 1.9 |
| 6 | XZ22-2 | 10 | |||||
| 7 | XZ22-3 | 10 | |||||
| 8 | XZ22-4 | 25 |
| 组号 | 编号 | 冻融 次数 | 围压/ MPa | 组号 | 编号 | 冻融 次数 | 围压/ MPa |
|---|---|---|---|---|---|---|---|
| 理塘 1组 | CX073-1-1 | 0 | 0 | 理塘 2组 | CX073-1-11 | 10 | 0 |
| CX073-1-2 | CX073-1-12 | ||||||
| CX073-1-3 | CX073-1-14 | ||||||
| CX073-1-4 | 0 | 5 | CX073-2-1 | 10 | 5 | ||
| CX073-1-5 | CX073-2-2 | ||||||
| CX073-1-6 | 0 | 10 | CX073-2-3 | 10 | 10 | ||
| CX073-1-7 | CX073-2-4 | ||||||
| CX073-1-8 | 0 | 15 | CX073-2-5 | 10 | 15 | ||
| CX073-1-9 | CX073-2-6 | ||||||
| 理塘 3组 | CX073-2-7 | 20 | 0 | 理塘 4组 (波速、 核磁) | CX073-3-2 | 30 | 0 |
| CX073-2-8 | CX073-3-3 | ||||||
| CX073-2-9 | CX073-3-4 | ||||||
| CX073-2-10 | 20 | 5 | CX073-4-1 | 30 | 5 | ||
| CX073-2-11 | CX073-4-2 | ||||||
| CX073-2-12 | 20 | 10 | CX073-4-4 | 30 | 10 | ||
| CX073-2-13 | CX073-4-5 | ||||||
| CX073-2-14 | 20 | 15 | CX073-4-6 | 30 | 15 | ||
| CX073-3-1 | CX073-4-7 |
Table 2 Freezing-thawing and triaxial test schemes of Litanggranites
| 组号 | 编号 | 冻融 次数 | 围压/ MPa | 组号 | 编号 | 冻融 次数 | 围压/ MPa |
|---|---|---|---|---|---|---|---|
| 理塘 1组 | CX073-1-1 | 0 | 0 | 理塘 2组 | CX073-1-11 | 10 | 0 |
| CX073-1-2 | CX073-1-12 | ||||||
| CX073-1-3 | CX073-1-14 | ||||||
| CX073-1-4 | 0 | 5 | CX073-2-1 | 10 | 5 | ||
| CX073-1-5 | CX073-2-2 | ||||||
| CX073-1-6 | 0 | 10 | CX073-2-3 | 10 | 10 | ||
| CX073-1-7 | CX073-2-4 | ||||||
| CX073-1-8 | 0 | 15 | CX073-2-5 | 10 | 15 | ||
| CX073-1-9 | CX073-2-6 | ||||||
| 理塘 3组 | CX073-2-7 | 20 | 0 | 理塘 4组 (波速、 核磁) | CX073-3-2 | 30 | 0 |
| CX073-2-8 | CX073-3-3 | ||||||
| CX073-2-9 | CX073-3-4 | ||||||
| CX073-2-10 | 20 | 5 | CX073-4-1 | 30 | 5 | ||
| CX073-2-11 | CX073-4-2 | ||||||
| CX073-2-12 | 20 | 10 | CX073-4-4 | 30 | 10 | ||
| CX073-2-13 | CX073-4-5 | ||||||
| CX073-2-14 | 20 | 15 | CX073-4-6 | 30 | 15 | ||
| CX073-3-1 | CX073-4-7 |
| 组号 | 编号 | 冻融 次数 | 围压/ MPa | 组号 | 编号 | 冻融 次数 | 围压/ MPa |
|---|---|---|---|---|---|---|---|
| 八宿 1组 | SXZ005-2-1 | 0 | 0 | 八宿 2组 | SXZ022-1-8 | 10 | 0 |
| SXZ005-2-2 | SXZ022-1-9 | ||||||
| SXZ005-2-3 | SXZ022-1-10 | ||||||
| SXZ022-1-1 | 0 | 5 | SXZ022-3-1 | 10 | 5 | ||
| SXZ022-1-3 | SXZ022-3-2 | ||||||
| SXZ022-1-4 | 0 | 10 | SXZ022-3-3 | 10 | 10 | ||
| SXZ022-1-5 | SXZ022-3-4 | ||||||
| SXZ022-1-6 | 0 | 15 | SXZ022-3-5 | 10 | 15 | ||
| SXZ022-1-7 | SXZ022-3-6 | ||||||
| 八宿 3组 | SXZ022-3-7 | 20 | 0 | 八宿 4组 | SXZ022-4-14 | 30 | 0 |
| SXZ022-3-8 | SXZ022-4-15 | ||||||
| SXZ022-3-9 | SXZ022-4-16 | ||||||
| SXZ022-3-10 | 20 | 5 | SXZ022-4-17 | 30 | 5 | ||
| SXZ022-4-9 | SXZ022-4-18 | ||||||
| SXZ022-4-10 | 20 | 10 | SXZ022-4-19 | 30 | 10 | ||
| SXZ022-4-11 | SXZ022-4-20 | ||||||
| SXZ022-4-12 | 20 | 15 | SXZ022-4-21 | 30 | 15 | ||
| SXZ022-4-13 | SXZ022-4-22 | ||||||
| 八宿 5组 (波速、 核磁) | SXZ022-4-23 | 40 | 0 | 八宿 5组 (波速、 核磁) | SXZ022-4-5 | 40 | 10 |
| SXZ022-4-24 | SXZ022-4-6 | ||||||
| SXZ022-4-25 | SXZ022-4-7 | 40 | 15 | ||||
| SXZ022-4-3 | 40 | 5 | SXZ022-4-8 | ||||
| SXZ022-4-4 |
Table 3 Freezing-thawing and triaxial test schemes of Basugranites
| 组号 | 编号 | 冻融 次数 | 围压/ MPa | 组号 | 编号 | 冻融 次数 | 围压/ MPa |
|---|---|---|---|---|---|---|---|
| 八宿 1组 | SXZ005-2-1 | 0 | 0 | 八宿 2组 | SXZ022-1-8 | 10 | 0 |
| SXZ005-2-2 | SXZ022-1-9 | ||||||
| SXZ005-2-3 | SXZ022-1-10 | ||||||
| SXZ022-1-1 | 0 | 5 | SXZ022-3-1 | 10 | 5 | ||
| SXZ022-1-3 | SXZ022-3-2 | ||||||
| SXZ022-1-4 | 0 | 10 | SXZ022-3-3 | 10 | 10 | ||
| SXZ022-1-5 | SXZ022-3-4 | ||||||
| SXZ022-1-6 | 0 | 15 | SXZ022-3-5 | 10 | 15 | ||
| SXZ022-1-7 | SXZ022-3-6 | ||||||
| 八宿 3组 | SXZ022-3-7 | 20 | 0 | 八宿 4组 | SXZ022-4-14 | 30 | 0 |
| SXZ022-3-8 | SXZ022-4-15 | ||||||
| SXZ022-3-9 | SXZ022-4-16 | ||||||
| SXZ022-3-10 | 20 | 5 | SXZ022-4-17 | 30 | 5 | ||
| SXZ022-4-9 | SXZ022-4-18 | ||||||
| SXZ022-4-10 | 20 | 10 | SXZ022-4-19 | 30 | 10 | ||
| SXZ022-4-11 | SXZ022-4-20 | ||||||
| SXZ022-4-12 | 20 | 15 | SXZ022-4-21 | 30 | 15 | ||
| SXZ022-4-13 | SXZ022-4-22 | ||||||
| 八宿 5组 (波速、 核磁) | SXZ022-4-23 | 40 | 0 | 八宿 5组 (波速、 核磁) | SXZ022-4-5 | 40 | 10 |
| SXZ022-4-24 | SXZ022-4-6 | ||||||
| SXZ022-4-25 | SXZ022-4-7 | 40 | 15 | ||||
| SXZ022-4-3 | 40 | 5 | SXZ022-4-8 | ||||
| SXZ022-4-4 |
Fig.2 Wave velocities of samples from Litang (a) and Basu (b)granites after the freezing-thawing test
Fig.3 Curves showing velocity change of samples from Litang (a) and Basu (b) granites with numbers of freezing-thawing cycles
Fig.4 FID values of samples from Litang (a) and Basu (b) granites after the freezing-thawing test
Fig.5 Curves of water content and density of samples vs. the number of freezing-thawing cycles
Fig.6 Curves of T2 distribution for the representative testing samples
Fig.7 Curves of stress vs. strain (a) and axial strain(b) for typical samples
Fig.8 The variation of elasticity modulus and Poisson’s ratio of samples vs. the number of freezing-thawing cycles
Fig.9 The variation of strength of samples vs. the confining pressure(a) and Mohr’s circle and strength envelope line(b)
| 冻融次数 | 理塘花岗岩 | 八宿花岗岩 | |||
|---|---|---|---|---|---|
| c/MPa | φ/(°) | c/MPa | φ/(°) | ||
| 0 | 5.77 | 53.54 | 19.23 | 55.24 | |
| 10 | 9.28 | 48.78 | 16.67 | 57.37 | |
| 20 | 6.28 | 47.79 | 16.05 | 56.02 | |
| 30 | 7.86 | 39.3 | 15.55 | 55.67 | |
| 40 | 16.05 | 55.04 | |||
Table 4 The variation of strength parameters of samples vs. the number of freezing-thawing cycles
| 冻融次数 | 理塘花岗岩 | 八宿花岗岩 | |||
|---|---|---|---|---|---|
| c/MPa | φ/(°) | c/MPa | φ/(°) | ||
| 0 | 5.77 | 53.54 | 19.23 | 55.24 | |
| 10 | 9.28 | 48.78 | 16.67 | 57.37 | |
| 20 | 6.28 | 47.79 | 16.05 | 56.02 | |
| 30 | 7.86 | 39.3 | 15.55 | 55.67 | |
| 40 | 16.05 | 55.04 | |||
Fig.10 The variation of strength of samples vs. the number of freezing-thawing cycles
Fig.11 The variation of stress-strain in the new and old coordinate systems
Fig.12 The variation of damage factor of samples
Fig.13 The variation of residual strength of samples vs. number of freezing-thawing cycles
Fig.14 The variation of ln(1/D-1) vs. ε 1 '
| 参数 | E/MPa | μ | c1/MPa | c2 | c3/MPa |
|---|---|---|---|---|---|
| 取值 | 29 000 | 0.31 | -0.384 0 | 4.938 | 33.93 |
| 参数 | r | d1 | d2/MPa-1 | d3 | |
| 取值 | 2 056.6 | -0.077 | 0.72 | 11.9 |
Table 5 List of parameters and their values
| 参数 | E/MPa | μ | c1/MPa | c2 | c3/MPa |
|---|---|---|---|---|---|
| 取值 | 29 000 | 0.31 | -0.384 0 | 4.938 | 33.93 |
| 参数 | r | d1 | d2/MPa-1 | d3 | |
| 取值 | 2 056.6 | -0.077 | 0.72 | 11.9 |
Fig.15 Curves of stress vs. strain for Basu granites (points are experimental and full lines are calculated)
Fig.16 Curves of stress vs. strain with different numbers of freezing-thawing cycles for Basu granites
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