基于流固耦合的坝基中弱透水层对渗流的影响分析
发布时间：2018-11-06 14:19
【摘要】：深厚覆盖层坝基中存在弱透水层时,弱透水层往往既是隔水层又是软弱夹层,是利用其作为渗流控制依托层,还是不考虑其防渗作用,关系到防渗工程的成本、进度等。流固耦合能较真实反映出弱透水层对坝基渗流场和应力场的影响,该文以比奥固结理论为基础,结合土体非线性流变理论,将土体本构关系推广到黏弹塑性,同时考虑土体力学参数及水力参数的动态变化关系,借助ADINA进行双场耦合求解,分析上江坝深厚覆盖层坝基中弱透水层对土石坝渗流场、应力场和自身应力应变的影响。研究表明:半封闭式防渗墙和弱透水层可形成坝基内部的联合防渗体系,能达到显著的渗流控制效果,大坝渗流量、坝基出逸坡降和弱透水层自身应力应变均小于其允许值,能保证大坝的安全稳定运行。但同时防渗墙和弱透水层承受的应力应变会相对增加,需要采取合理的工程措施给予辅助。实例中防渗墙深度相比封闭式防渗墙减小近60 m,若方案能给与采用,可大大减少工程造价。因此,坝基内部若存在弱透水层应该给与足够的重视,科学论证后若能加以利用,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;
【基金】：国家自然基金(51309262) 重庆市科委基础与前沿研究计划项目(cstc2015jcyj A0300) 重庆三峡学院校企合作项目(15XQ01)~~
【分类号】：TV223.4
本文编号：2314530
[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;
【基金】：国家自然基金(51309262) 重庆市科委基础与前沿研究计划项目(cstc2015jcyj A0300) 重庆三峡学院校企合作项目(15XQ01)~~
【分类号】：TV223.4
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1 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
2 ;[J];;年期
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