Abstract：A geometric model of joint surfaces was constructed through the fractional Brown function. The finite element analysis on the basis of N-S equations was conducted to the fracture grouting process. The influence of roughness and connectivity of joint surfaces on the fracture grouting was investigated and the rationality of the modified cubic law was analyzed. When the potential of the interface layer is relatively low，the calculation results of the modified cubic law are lower than the actual values. When the contacting area is uniformly distributed，the degree of anisotropy is low and the calculated deviation is small，and vice versa. A grout spreading formula based on the modified cubic law，constitutive equation of interface layer and grout flow equation was proposed considering the grout-rock coupling effect. The calculated distance of grout spreading is greater than that without the coupling effect. The calculation deviation is also larger with the increase of grout viscosity.
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2017, Vol. 36 
