裂隙岩体渗流应力耦合机制研究

隧洞开挖前,岩体中的地下水与围岩应力处于一种相对平衡状态,由于隧洞的开挖,一方面使地下水排泄有了新的通道,加速了水循环,破坏了原有的补给一运移一排泄系统的平衡;另一方面,造成围岩应力重分布,部分结构面由于增压而闭合,部分岩体卸荷松弛或产生剪切滑移,人为破坏了原有的地下水渗流条件,使得隧洞自身成为地下水向外排泄的地下廊道...

RESEARCH ON TRANSFUSION STRESS COUPLING MECHANISM OF CREVASSE ROCK MASS

Before a tunnel excavation,the groundwater in the rock and the surrounding rock stress are in a state of relative balance,because the excavation makes tunnel groundwater drain has a new channel,thus accelerating the water cycle,which destroyed balance of the original supplies-migration-the drainage system;On the other hand,the surrounding rock stress was redistributed and part of structural surface was closed due to pressurization,part of unloading rock mass produced shear slippage,which vandalized the original groundwater seepage condition,thus making tunnel itself become an underground corridor to discharge water in different forms,resulting in bursting water disasters.Monte Carlo method was used to establish 2-d discrete-fracture network,which was input rock mass structure discrete fissure network medium model(DFN),according to the model of the discrete element method in fractured rock mass seepage characteristics,fracture rock cavern excavation mechanical characteristics and seepage stress coupling mechanism of fractured rock mass.Combined with concrete examples,a comparison was done for cases of excavating caverns in fractured rocks with and without consideration of hydraulic coupling.