岩体裂隙内稳定水泥浆液扩散范围的理论分析

根据粗糙裂隙的等效水力开度与力学开度的关系,导出了计算粗糙裂隙内流体扩散范围的修正系数;然后建立了宾汉浆体在光滑裂隙内的辐射流运动方程,求解得到预测稳定水泥浆液最大扩散距离的解析公式;该公式经给定的修正系数修正后可应用于粗糙岩体裂隙。研究结果表明,现有求解岩体裂隙内浆液扩散半径的理论公式中,裂隙的开度值应取粗糙裂隙的等效水力开度,且预测公式应该用一个小于1的系数修正。

Estimation on Penetrating Radius of Stable Cement Grouts in Rock Fractures

Based on the relationship between the equivalent hydraulic aperture and mechanics aperture of rough-walled fractures,the correction coefficient on grout penetrating radius in rough-walled fractures is deduced.Then,the radial movement equation of Bingham fluids in smooth-walled fracture is established.By solving the equation,an analytic formula for estimating maximum penetrating radius of stable cement grouts is obtained.After that,the corrected formula for rough-walled fractures is gained and a typical example is given.The result demonstrates that the fracture aperture in extant formulas for estimating the grout penetrating radius should be the equivalent hydraulic aperture of rough-walled fractures,and these forecast formulas should be corrected by a coefficient that is less than 1.