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首页> 外文期刊>Bulletin of engineering geology and the environment >Estimation of the grout take using empirical relationships (case study: Bakhtiari dam site)
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Estimation of the grout take using empirical relationships (case study: Bakhtiari dam site)

机译：使用经验关系估算灌浆量（案例研究：Bakhtiari大坝现场）

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摘要

Seepage in the foundation and abutments of a dam can lead to wasting of the stored water in the reservoir, erosion of the foundation materials and increasing the uplift pressure. It can endanger the long term stability of the dam. Cement grouting is one of the seepage control methods which is generally implemented according to the Lugeon test results. In this study, the grout volume has been examined against Q-value, Lugeon number, SPI (Secondary permeability index) value and joint apertures in the Bakhtiari dam site. In Bakhtiari dam site, the left and the right abutment trial grouting boreholes were drilled up to the final depth of 60 and 100 m, respectively. Limestone of the Sarvak Formation is the dominant rock type in the site. The Q-system parameters have been evaluated by eye-examination of rock cores, the Lugeon numbers and SPI values have been deduced from the water pressure tests and the joint apertures have been calculated based on the permeability of rock mass and the joints spacing. The Q-value, the Lugeon number, the SPI value and the joint aperture have been compared with measured cement take and grout take in the trial grouting boreholes. A general correlation exists, especially when the mentioned parameters have been compared with normalized grout take. Against these general agreements the coefficients of determination for the fitted relations are low or moderate, and it seems that more research has been needed to assessing a reliable predictive relation for the grout and cement takes.
机译：大坝基础和桥墩的渗水会导致水库中储存水的浪费，基础材料的侵蚀以及上升压力的增加。它可能危害大坝的长期稳定性。水泥灌浆是渗流控制方法之一，通常根据Lugeon试验结果实施。在这项研究中，已针对Bakhtiari坝址的Q值，Lugeon数，SPI（二次渗透指数）值和接缝孔径检查了灌浆量。在巴赫蒂亚里（Bakhtiari）大坝现场，左，右基台试验注浆钻孔分别钻至最终深度60和100 m。萨尔瓦克组的石灰岩是该地区的主要岩石类型。通过岩心检查对Q系统参数进行了评估，从水压测试中推导了Lugeon数和SPI值，并根据岩体的渗透率和节理间距计算了节理孔径。在试验注浆孔中，将Q值，Lugeon数，SPI值和接头孔径与测得的水泥量和灌浆量进行了比较。存在普遍的相关性，尤其是在将上述参数与标准化灌浆进行比较时。根据这些一般性协议，拟合关系的确定系数较低或适中，似乎需要更多的研究来评估水泥浆和水泥浆的可靠预测关系。

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