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把土体当作理想塑性体，根据材料服从Ｔｒｅｓｃａ 屈服准则，并结合Ｍａｇｇ 公式，按球体扩张理论推导出点状注浆时，劈裂地层中浆液的扩散半径、注浆压力和注浆时间，经与实测对比较为吻合。
According to the Tresca yield criterion according to the material and the Magg formula, the diffusion radius, grouting pressure and grouting time of the slurry in the splitting formation are deduced according to the spheroid expansion theory. The comparison with the measured is consistent.