【摘要】：我國西南、西北地區(qū)常存在強(qiáng)弱互層的深厚覆蓋層壩基,弱透水層在深厚覆蓋層壩基中對滲流影響較大,其影響規(guī)律需要深入研究。試驗(yàn)中將弱透水層設(shè)置在壩基的不同位置,變化垂直防滲墻的深度。試驗(yàn)結(jié)果表明,弱透水層處在中間位置處,其與防滲墻形成半封閉式聯(lián)合防滲體系能有效降低壩基滲流量與出逸坡降;上江壩工程實(shí)例中,經(jīng)半封閉式聯(lián)合防滲體系降低后的滲流量及出逸坡降皆在允許范圍內(nèi);從理論層面上考慮,該弱透水層若能加以利用,可大大減小防滲墻深度。此外,研究還發(fā)現(xiàn),當(dāng)防滲墻位置越深,其與防滲墻形成的半封閉式防滲體系越能有效減小滲流量及出逸坡降。研究成果能為類似工程提供一定的理論參考及建議,從而降低工程造價(jià)。
[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.
【作者單位】： 重慶三峽學(xué)院土木工程學(xué)院;石河子大學(xué)水利建筑工程學(xué)院;河海大學(xué)環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51309262) 重慶市科委基礎(chǔ)與前沿研究計(jì)劃項(xiàng)目(cstc2015jcyjA0300,cstc2015jcyjA00022)資助
【分類號(hào)】：TV223.4

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