| 孔隙水压力对岩石裂纹扩展影响的数值模拟 |
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| 引用本文： | 唐春安,杨天鸿,李连崇,梁正召,ThamL.G.,LeeK.K.,TsuiY..孔隙水压力对岩石裂纹扩展影响的数值模拟[J].岩土力学,2003(Z2). |
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| 作者姓名： | 唐春安 杨天鸿 李连崇 梁正召 ThamL.G. LeeK.K. TsuiY. |
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| 作者单位： | 东北大学岩石破裂与失稳研究中心沈阳110004
(唐春安，杨天鸿，李连崇，梁正召)，香港大学土木系香港
(ThamL.G.，LeeK.K.)，香港大学土木系香港(TsuiY.) |
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| 摘 要： | 应用岩石破坏过程渗流-应力-损伤(FSD)耦合分析软件F-RFPA2D,通过对孔隙水压作用下岩石试件加载破坏过程的数值模拟,对孔隙水压力大小和梯度对岩石试样中裂纹的萌生和扩展进行了数值模拟研究。模拟结果再现了孔隙水压力作用下裂纹萌生扩展的全过程,表明孔隙水压力大小和梯度对岩石中裂纹的萌生和扩展模式都有很大的影响。
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| 关 键 词： | 渗流机理 非均匀性 孔隙水压 数值模拟 破坏过程 |
Numerical simulation to influence of pore pressure magnitude and gradient on fracture propagation in brittle heterogeneous rocks |
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| TANG Chun-an,YANG Tian-hong,LI Lian-cong,LIANG Zheng-zhao,Tham L. G.,Lee K. K.,Tsui Y..Numerical simulation to influence of pore pressure magnitude and gradient on fracture propagation in brittle heterogeneous rocks[J].Rock and Soil Mechanics,2003(Z2). |
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| Authors: | TANG Chun-an YANG Tian-hong LI Lian-cong LIANG Zheng-zhao Tham L G Lee K K Tsui Y |
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| Institution: | TANG Chun-an1,YANG Tian-hong1,LI Lian-cong1,LIANG Zheng-zhao1,Tham L. G.2,Lee K. K.2,Tsui Y.2 |
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| Abstract: | A series of numerical tests of hydraulic fracturing in heterogeneous rocks were performed to investigate the influence of pore pressure magnitude and gradient on initiation and propagation of tensile fractures. The numerical tests were run with a Rock Failure Process Analysis code, F-RFPA2D, incorporated with a Flow-Stress-Damage coupling model (FSD). To investigate the influence of pore pressure magnitude on fracture behaviour, pinch-off breaking tests, originally employed by Bridgeman to investigate the effective stress law for tensile fracture in a uniform pore pressure field, were numerically modeled. In another numerical test, a double-notched sample, with fluid pressure in one notch while keeping another one open to the atmosphere, is numerically extended to investigate how the fluid flow direction or the pore pressure gradient will influence the fracture behaviour. The simulation results show that fracture is strongly influenced by both pore pressure magnitude and pore pressure gradient. |
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| Keywords: | seepage mechanics heterogeneous pore pressure numerical simulation failure process |
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