Evaluation of the Permeability of Rock Masses around the Equalized Room with Atmoseal at Ziyili Hydropower Station, Sichuan Province
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摘要: 结合自一里水电工程气垫式调压室设计厂房区岩体渗透性研究, 提出了从定性分析到定量计算与评价, 系统刻画岩体渗透性与分区评价, 以满足气垫式调压室设计要求的实用方法.该方法以基础地质与水文地质研究为背景, 从系统全面的裂隙测量与统计分析中, 获取岩体裂隙空间发育规律和裂隙方向、隙宽、迹长、间距和裂隙率等统计特征值, 运用裂隙岩体渗透张量理论, 得出分布式岩体渗透主值和综合渗透系数; 在此基础上, 进行岩体渗透性分区与评价.评价得出: 花岗岩夹变质砂岩透镜体的厂区岩体渗透性总体随深度变化, 受接触带影响局部渗透性呈强弱交替变化; 区内裂隙岩体的渗透性分3级, 近地表浅层岩体渗透性较强, 综合渗透系数为n×100 m/d~n×10-1 m/d, 调压室区为中等~弱渗透性岩体, 渗透系数为n×10-2 m/d~n×10-4 m/d.Abstract: Ziyili Hydropower Station in Sichuan Province uses an equalized room fitted with atmoseal, which needs a more precise investigation on the permeability of rock masses around the power house. This paper proposes an effective method that systematically characterizes the permeability of rock masses, from qualitative analyses to quantitative analyses. Based on a study of basic geology and hydrogeology conditions, we measured the geometric parameters of fractures (such as orientation, aperture, trace length, space and fracture frequency) and obtained their characteristic statistical values. We then calculated the main value and comprehensive value of the permeability tensor using permeability tensor theory, and finally divided the rock masses around the power house into a few permeability subareas. The general permeability of the rock masses around the power house varies with depth and the local permeability varies alternately between the higher and the lower due to the effect of the contact strip. The permeability can be divided into three grades. The permeability of rock masses near the surface is higher (n×100 m/d~n×10-1 m/d) and permeability of rock masses around the equalized room with atmoseal is moderate to lower (n×10-2 m/d~n×10-4 m/d).
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图 1 自一里水电站厂址区综合水文地质图
1.主要出水点及编号; 2.线状出水点; 3.地下水流线; 4.来源较高处地下水流线; 5.水型分区界线; 6.水化学类型; 7.岩性分界线; 8.花岗岩(含变质砂岩捕虏体); 9.变质砂岩; 10.花岗岩变质砂岩交替; 11. 平硐编号; 12.地温及等温线
Fig. 1. Comprehensive hydrogeology sketch of power-house site area in Ziyili Hydropower Station
表 1 厂址区平硐裂隙产状分组
Table 1. Groups of fracture orientation in adits at power-house site area
表 2 平硐测点线、面裂隙率统计
Table 2. Statistics of line fracture frequency and surface fracture frequency in adits
表 3 厂区平硐岩体渗透张量平均值与偏大值部分结果
Table 3. Statistics of average value and higher value of permeability tensor of fractured rock in adits at power-house site area
表 4 厂址区岩体渗透性分区说明
Table 4. Permeability zoning explanation of fractured rocks at power-house site area
表 5 厂址区岩体渗透性分区与其他指标分区比较
Table 5. Comparison of permeability zoning and other indexes zoning of fractured rock at powerhouse site area
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