【摘要】：深厚覆蓋層壩基中存在弱透水層時,弱透水層往往既是隔水層又是軟弱夾層,是利用其作為滲流控制依托層,還是不考慮其防滲作用,關(guān)系到防滲工程的成本、進度等。流固耦合能較真實反映出弱透水層對壩基滲流場和應(yīng)力場的影響,該文以比奧固結(jié)理論為基礎(chǔ),結(jié)合土體非線性流變理論,將土體本構(gòu)關(guān)系推廣到黏彈塑性,同時考慮土體力學參數(shù)及水力參數(shù)的動態(tài)變化關(guān)系,借助ADINA進行雙場耦合求解,分析上江壩深厚覆蓋層壩基中弱透水層對土石壩滲流場、應(yīng)力場和自身應(yīng)力應(yīng)變的影響。研究表明:半封閉式防滲墻和弱透水層可形成壩基內(nèi)部的聯(lián)合防滲體系,能達到顯著的滲流控制效果,大壩滲流量、壩基出逸坡降和弱透水層自身應(yīng)力應(yīng)變均小于其允許值,能保證大壩的安全穩(wěn)定運行。但同時防滲墻和弱透水層承受的應(yīng)力應(yīng)變會相對增加,需要采取合理的工程措施給予輔助。實例中防滲墻深度相比封閉式防滲墻減小近60 m,若方案能給與采用,可大大減少工程造價。因此,壩基內(nèi)部若存在弱透水層應(yīng)該給與足夠的重視,科學論證后若能加以利用,能做到事半功倍。
[Abstract]:When there is a weak permeable layer in the deep overburden dam foundation, the weak permeable layer is often both a waterproof layer and a weak intercalation layer. Whether it is used as the supporting layer for seepage control or not considered, it is related to the cost and progress of the seepage control project. The fluid-solid coupling energy truly reflects the influence of weak permeable layer on seepage field and stress field of dam foundation. Based on Biot consolidation theory and the nonlinear rheological theory of soil, the constitutive relation of soil is extended to viscoelastic-plastic. At the same time, considering the dynamic change of soil mechanics parameter and hydraulic parameter, the influence of weak permeable layer in deep overburden dam foundation of Shangjiang dam on seepage field, stress field and self stress strain of earth-rock dam is analyzed by means of two-field coupling solution of ADINA. The results show that the combined seepage control system within the dam foundation can be formed by the semi-closed impervious wall and the weak permeable layer, and the seepage flow of the dam, the escape slope of the dam foundation and the stress and strain of the weak permeable layer are all less than the allowable value. It can ensure the safe and stable operation of the dam. But at the same time, the stress and strain of the impervious wall and the weak permeable layer will increase relatively, so it is necessary to take reasonable engineering measures to assist. Compared with the closed cutoff wall, the depth of the cutoff wall in the example is reduced by nearly 60 ms. if the scheme can be adopted, the project cost can be greatly reduced. Therefore, if there is a weak permeable layer in the dam foundation, enough attention should be paid to it, and if it can be used after scientific demonstration, it can achieve twice the result with half the effort.
【作者單位】： 重慶三峽學院土木工程學院;石河子大學水利建筑工程學院;
【基金】：國家自然基金(51309262) 重慶市科委基礎(chǔ)與前沿研究計劃項目(cstc2015jcyj A0300) 重慶三峽學院校企合作項目(15XQ01)~~
【分類號】：TV223.4

【相似文獻】

相關(guān)期刊論文 前2條

1 邱昕;應(yīng)用Cokriging空間插值技術(shù)協(xié)同生成弱透水層流場[J];國土與自然資源研究;2002年02期

2 ;[J];;年期

，

本文編號：2314530