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Cavity expansion theory of compaction grouting in saturated clay
considering pressure filtration |
| ZHANG Zhong-miao, ZOU Jian, HE Jing-yu, LIN Cun-gang |
1. Institute of Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310027,China；
2. Key Laboratory of Soft Soils and Geoenvironmental Engineering,Ministry of Education,
Zhejiang University,Hangzhou,Zhejiang 310058,China |
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Abstract The control equation of cavity expansion theory of compaction grouting in saturated clay is derived by introducing an effective stress ratio to study the effect of pressure filtration on compaction grouting. In this control equation, the pressure filtration can be taken into account. Furthermore, equations of radial stress and radial deformation are derived. The comparisons between this present theory and the traditional cavity expansion theory show that traditional cavity expansion theory can not consider the impact of effective stress ratio and pressure filtration, so lower effective stress ratio will lead to larger error. In given grouting pressure, with the decrease of effective stress ratio, the radial stress and the radial deformation of inner soil decrease, while the radial stress and the radial deformation of lateral soil increase. The influence of pressure filtration on compaction grouting increases when the effective stress ratio decreases.
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Published: 08 December 2011
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考虑压滤效应下饱和黏土压密注浆柱扩张理论
为了研究压滤效应对压密注浆的影响,在考虑滤出水渗流和土体弹性变形耦合的基础上,推导出考虑压滤效应时饱和黏土压密注浆柱孔扩张的控制方程.并在不考虑土体渗透率的变化的前提下,对该控制方程进行简化,得到径向应力和径向位移的表达式,该简化方法可较好地计算柱孔扩张问题中径向应力和径向位移.与考虑压滤效应下柱扩张理论相比较,传统的柱孔扩张理论无法考虑压滤效应和有效应力比的影响,当有效应力比较小时(即浆液较稀),传统方法的误差较大.利用考虑压滤效应下柱扩张理论对压密注浆过程进行分析,结果表明：在相同的注浆压力下,随着有效应力比α的减小,内侧土体的径向应力和径向位移逐渐减小,外侧土体的径向应力和径向位移逐渐增大.有效应力比越小,即浆液越稀,压滤效应对压密注浆的影响越大.
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