Cement grout transport within sand with fractal characteristics considering filtration
Cement grout transport within sand with fractal characteristics considering filtration
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DOI：
10.1080/19648189.2017.1358217
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发表时间：
2019-12
影响因子：
2.1
通讯作者：
Zilong Zhou;Xueming Du;Shanyong Wang;Xin Cai;Zhao Chen
中科院分区：
文献类型：
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作者：
Zilong Zhou;Xueming Du;Shanyong Wang;Xin Cai;Zhao Chen
摘要渗流效应广泛存在于多孔介质中混浊流体的渗流过程中，它直接影响着混浊流体颗粒的整个扩散和运移过程。为了更好地了解注浆参数对考虑渗流的水泥基颗粒运移规律（如速度、粘度和有效距离）的影响，对具有分形特征的砂土进行了室内试验，考虑了不同注浆压力、围压、水灰比和质量分维数。通过分析不同注浆参数下水泥浆柱出口处浆液流速、粘度的变化以及试件孔隙率的变化，探讨了颗粒运移的机理。结果表明：（1）浆液的粘度和有效范围随灌浆压力的增大呈先增大后减小的趋势，当水灰比小于3.0时，浆液的粘度呈非线性增大，超过3.0后，浆液的粘度减小缓慢，有效范围随水灰比的增大呈先增大后减小的非线性变化;（4）随着质量分数维的增大，粘度先非线性增大，然后迅速减小;（5）随着分数维的增大，有效射程减小。
Abstract Filtration effect exists widely in the process of turbid fluid seepage in porous media, which directly influence the whole diffusion and migration process of turbid fluid particle. To better understand the effects of grouting parameters on the transport rules (e.g. velocity, viscosity and effective distance) of cement-based particle considering filtration, laboratory tests were carried out on fractal characteristics’ sand, with different grouting pressure, confining pressure, water/cement and mass fractal dimension taken into account. In this study, the mechanism governing the transport of particles was investigated by analysing the variety of velocity and viscosity of slurry at the column outlet, as well as the porosity of specimens at different grouting parameters. The results indicated that (1)The viscosity of passed grouts and the effective range is increasing firstly and then decreasing with the grouting pressure; (2) The viscosity increases non-linearly when the water/cement ratio is less than 3.0, beyond which it decreases slowly; (3) The effective range presents non-linear increasing firstly and then decreasing with increase of water/cement ratio; (4) The viscosity increases non-linearly firstly, and then decreases rapidly with increase of mass fractal dimension; (5) The effective range decreases when the fractal dimension increases.