深厚覆盖层中弱透水层对渗流影响的试验研究
发布时间：2018-12-08 11:48
【摘要】：我国西南、西北地区常存在强弱互层的深厚覆盖层坝基,弱透水层在深厚覆盖层坝基中对渗流影响较大,其影响规律需要深入研究。试验中将弱透水层设置在坝基的不同位置,变化垂直防渗墙的深度。试验结果表明,弱透水层处在中间位置处,其与防渗墙形成半封闭式联合防渗体系能有效降低坝基渗流量与出逸坡降;上江坝工程实例中,经半封闭式联合防渗体系降低后的渗流量及出逸坡降皆在允许范围内;从理论层面上考虑,该弱透水层若能加以利用,可大大减小防渗墙深度。此外,研究还发现,当防渗墙位置越深,其与防渗墙形成的半封闭式防渗体系越能有效减小渗流量及出逸坡降。研究成果能为类似工程提供一定的理论参考及建议,从而降低工程造价。
[Abstract]:Deep overburden dam foundation with strong and weak interbedded layer often exists in southwest and northwest of China. Weak permeable layer has great influence on seepage flow in deep overburden dam foundation, and its influence law needs to be deeply studied. In the test, the weak permeable layer is set in different positions of the dam foundation to change the depth of the vertical impervious wall. The test results show that the weak permeable layer is in the middle position, and the semi-closed combined seepage control system with the impervious wall can effectively reduce the seepage discharge and escape slope of the dam foundation. In the case of Shangjiang Dam project, the seepage volume and the escape slope drop after the reduction of the semi-closed combined seepage control system are within the allowable range, and theoretically, if the weak permeable layer can be used, the depth of the impervious wall can be greatly reduced. In addition, it is also found that the more deep the cutoff wall is, the more effective the seepage volume and escape slope can be reduced by the semi-closed anti-seepage system formed by the cutoff wall. The research results can provide some theoretical references and suggestions for similar projects and thus reduce the project cost.
【作者单位】： 重庆三峡学院土木工程学院;石河子大学水利建筑工程学院;河海大学环境学院;
【基金】：国家自然科学基金项目(51309262) 重庆市科委基础与前沿研究计划项目(cstc2015jcyjA0300,cstc2015jcyjA00022)资助
【分类号】：TV223.4
本文编号：2368295
[Abstract]:Deep overburden dam foundation with strong and weak interbedded layer often exists in southwest and northwest of China. Weak permeable layer has great influence on seepage flow in deep overburden dam foundation, and its influence law needs to be deeply studied. In the test, the weak permeable layer is set in different positions of the dam foundation to change the depth of the vertical impervious wall. The test results show that the weak permeable layer is in the middle position, and the semi-closed combined seepage control system with the impervious wall can effectively reduce the seepage discharge and escape slope of the dam foundation. In the case of Shangjiang Dam project, the seepage volume and the escape slope drop after the reduction of the semi-closed combined seepage control system are within the allowable range, and theoretically, if the weak permeable layer can be used, the depth of the impervious wall can be greatly reduced. In addition, it is also found that the more deep the cutoff wall is, the more effective the seepage volume and escape slope can be reduced by the semi-closed anti-seepage system formed by the cutoff wall. The research results can provide some theoretical references and suggestions for similar projects and thus reduce the project cost.
【作者单位】： 重庆三峡学院土木工程学院;石河子大学水利建筑工程学院;河海大学环境学院;
【基金】：国家自然科学基金项目(51309262) 重庆市科委基础与前沿研究计划项目(cstc2015jcyjA0300,cstc2015jcyjA00022)资助
【分类号】：TV223.4
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1 叶淑君,薛禹群;应用沉降和水位数据计算上海地区弱透水层的参数[J];岩土力学;2005年02期
2 邱昕;应用Cokriging空间插值技术协同生成弱透水层流场[J];国土与自然资源研究;2002年02期
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