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Ayşe Pekrioglu Balkis 《Marine Georesources & Geotechnology》2020,38(1):73-82
AbstractThis study investigated the penetrability of high volume fly ash cement suspensions prepared with and without superplasticizer into sandy soil having different relative densities with 30%, 60%, 73%, and 83% through permeation grouting. Class C fly ash was used due to its pozzolanic activity and fineness. Due to engineering characteristics and cost, cementitious grouts are the most commonly used grout in both waterproofing and ground strengthening. Fly ash-cement grouts have relatively constant and low viscosity values for a reasonable period after preparation, exhibit limited or negligible bleed capacity and set and develop satisfactory strength within a relatively short period. Modeling of grouting of soil was done in laboratory and improvements in physical and mechanical properties of grouted soil were analyzed. Unconfined compressive strength, shear strength and permeability characteristics of grouted soil were studied as a result. Unconfined compressive strength values of grouted sand with high volume fly ash ranged between 410 and 1107?kPa. Morover, cohesion values were comparable to microfine cement grouting ranging from 373 to 511?kPa. Furthermore, permeability values were also approximately equal to the permeability of impervious liners, which is around 1?×?10?7?cm/s. The findings support the applicability of grouting in different applications. 相似文献
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泄水式管片衬砌泄流量对衬砌外荷载的影响研究 总被引：1，自引：0，他引：1
提出了采用泄水式管片衬砌结构型式解决铁路隧道高水压问题的结构设计理念。考虑渗流场对围岩应力场的影响,建立了水荷载为渗透体积力的管片衬砌外荷载计算公式,探讨了围岩渗透系数与最大可泄流量、衬砌控制泄流量与衬砌壁后接触应力的相互关系,以及围岩条件对衬砌壁后有效应力和接触应力的影响规律,并将该计算方法与远场水荷载视为面力的简易衬砌外荷载计算方法进行对比,以评估简易方法的可行性。结果表明：将水荷载视为面力与将其视为渗透体积力进行接触应力计算时,两者结果仅在一定条件下具有良好的接近度,前者只能作为衬砌外荷载选择的一种参考。 相似文献
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饱和砂层驱水渗透注浆分析 总被引：3，自引：0，他引：3
运用渗流力学理论,对饱和砂层在毛细力作用下的平面径向流、球形向心流两种渗透性注浆模型进行了推导,得到了球形和柱形渗透性注浆扩散公式。以球形扩散公式为例,结合工程实例并与常用的Maag球形扩散公式进行比较,结果表明,由Maag公式计算注浆所需时间偏小,文中公式更接近工程实际。最后探讨了注浆参数对扩散半径的影响,表明扩散半径对注浆参数的变化均较敏感,文中公式与Maag公式所得到的变化趋势基本一致。 相似文献
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