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| CEMENT GROUT DISPERSION CONSIDERING FILTRATION IN GRAVEL |
| FANG Kai1，2，XIA Tangdai1，2，BAO Liuqing3，YE Jianliang4，CHEN Shicai4 |
| (1. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. Zhejiang Building Design Branch，China Building Technique Group Co.，Ltd.，Hangzhou，Zhejiang 310009，China；4. Hangzhou Residential Development Center Co.，Ltd.，Hangzhou，Zhejiang 310000，China) |
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Abstract Due to progressive blocking of cement grains within the soil matrix，filtration of grout plays a significant role during grout dispersion process. The influence of filtration on the grout dispersion in gravel is studied. The injectability criterion of the grout is first summarized. Then the linear filtration law is introduced into the mass balance relationships of water，cement and soil to develop a cement grout dispersion model in spherical coordinates with account for filtration. The comparison between model results and experimental data proves the validity of the given model and the necessity of considering the phenomenon of filtration. In addition，the influences of filtration on permeation grouting under different injection durations and water-cement ratios are also studied. The results reveal that the penetration resistance increases gradually due to grout filtration，leading to the increase in grouting pressure with time. For grout with smaller water-cement ratio，the grouting pressure is larger and the influence of filtration is more obvious.
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Received: 24 October 2012
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2013, Vol. 32 
