人民黄河
人民黃河
인민황하
Yellow River
2015年
2期
119-122
,共4页
非贯穿性节理岩体%单轴压缩试验%数值模拟%尺寸效应
非貫穿性節理巖體%單軸壓縮試驗%數值模擬%呎吋效應
비관천성절리암체%단축압축시험%수치모의%척촌효응
non-penetrating joints rock mass%uniaxial compression test%numerical simulation%size effect
灵活运用ANSYS／FLAC3D等软件构建含有非贯穿性节理岩体的圆柱体试件。通过对比分析含单一结构面岩石的单轴压缩数值试验结果与已有研究成果，论证了此方法模拟裂隙岩体的合理性。在此基础上，通过模拟不同倾角和尺寸的圆柱体试件的单轴压缩试验，揭示了非贯穿性节理对岩体试件抗压强度的影响，以及含不同倾角的非贯穿性节理岩体单轴抗压强度的尺寸效应特征。当非贯穿性节理倾角为45°～60°时，试件单轴抗压强度存在最小值；当倾角为90°时，试件单轴抗压强度最大，即当非贯穿性节理与岩体受力方向平行时，对岩体单轴抗压强度影响较小；不同尺寸岩体试件单轴抗压强度随非贯穿性节理倾角的变化规律基本一致。含非贯穿性节理的岩体单轴抗压强度受节理倾角的影响较大，其变化规律与含贯穿性节理的岩体相似。除倾角90°岩体外，含非贯穿性节理的岩体单轴抗压强度存在明显的尺寸效应特征。
靈活運用ANSYS／FLAC3D等軟件構建含有非貫穿性節理巖體的圓柱體試件。通過對比分析含單一結構麵巖石的單軸壓縮數值試驗結果與已有研究成果，論證瞭此方法模擬裂隙巖體的閤理性。在此基礎上，通過模擬不同傾角和呎吋的圓柱體試件的單軸壓縮試驗，揭示瞭非貫穿性節理對巖體試件抗壓彊度的影響，以及含不同傾角的非貫穿性節理巖體單軸抗壓彊度的呎吋效應特徵。噹非貫穿性節理傾角為45°～60°時，試件單軸抗壓彊度存在最小值；噹傾角為90°時，試件單軸抗壓彊度最大，即噹非貫穿性節理與巖體受力方嚮平行時，對巖體單軸抗壓彊度影響較小；不同呎吋巖體試件單軸抗壓彊度隨非貫穿性節理傾角的變化規律基本一緻。含非貫穿性節理的巖體單軸抗壓彊度受節理傾角的影響較大，其變化規律與含貫穿性節理的巖體相似。除傾角90°巖體外，含非貫穿性節理的巖體單軸抗壓彊度存在明顯的呎吋效應特徵。
령활운용ANSYS／FLAC3D등연건구건함유비관천성절리암체적원주체시건。통과대비분석함단일결구면암석적단축압축수치시험결과여이유연구성과，론증료차방법모의렬극암체적합이성。재차기출상，통과모의불동경각화척촌적원주체시건적단축압축시험，게시료비관천성절리대암체시건항압강도적영향，이급함불동경각적비관천성절리암체단축항압강도적척촌효응특정。당비관천성절리경각위45°～60°시，시건단축항압강도존재최소치；당경각위90°시，시건단축항압강도최대，즉당비관천성절리여암체수력방향평행시，대암체단축항압강도영향교소；불동척촌암체시건단축항압강도수비관천성절리경각적변화규률기본일치。함비관천성절리적암체단축항압강도수절리경각적영향교대，기변화규률여함관천성절리적암체상사。제경각90°암체외，함비관천성절리적암체단축항압강도존재명현적척촌효응특정。
Simulating cylindrical rock masses specimens containing non-penetrating joints were created by using ANSYS/FLAC3D software . The method of simulating fractured rock masses was confirmed rationally by comparing the simulating uniaxial compression test results of a rock masses containing a single structural surface with the results of the real rock masses tests had been done before. Based on that,the im-pact of the non-penetrating joints on the compressive strength of rock mass specimens was revealed and the size effect features of the uniaxial compressive strength of the non-penetrating jointed rock mass with different inclination was revealed by simulating the uniaxial compression tests of the simulating cylindrical specimens with the different sizes and inclinations. When the non-penetrating joint inclinations changes between 45°~60°,the minimum uniaxial compressive strength is present. When the non-penetrating joint inclinations is 90°,the maximum uniaxial compressive strength is present. That is,when the non-penetrating joints is parallel with the stress direction,the impact on the u-niaxial compressive strength of a rock mass is lower. The changes pattern of the uniaxial compressive strength with the changes of the non-penetrating joints inclinations is basically the same although the sizes of the rock mass specimens are different. The uniaxial compressive strength of a rock mass containing non-penetrating joints is impacted larger by the joints inclinations. And the changes pattern is similar with the rock mass containing penetrating joints. Except the 90°inclinations rock mass,the uniaxial compressive strength of a rock mass con-taining non-penetrating joints exists a significant size effect features.
