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黄海均,严新军,毛海涛,等. 堤(坝)基层状粗粒土发生渗透变形的颗粒运移规律[J]. 科学技术与工程, 2020, 20(16): 6620-6627.
黄海均,et al.Study on particle migration law of seepage deformation of dam foundation with layered overburden[J].Science Technology and Engineering,2020,20(16):6620-6627.
堤(坝)基层状粗粒土发生渗透变形的颗粒运移规律
Study on particle migration law of seepage deformation of dam foundation with layered overburden
投稿时间:2019-09-09  修订日期:2020-05-31
DOI:
中文关键词:  多层结构  颗粒流  渗透变形  管涌
英文关键词:Multi-layer structure  particle flow  seepage deformation  piping
基金项目:国家自然科学基金(51309262);重庆市科委基础与前沿研究计划项目(cstc2018jcyjAX0673);重庆市教委2011协同创新子课题(061500911)
           
作者单位
黄海均 新疆农业大学 水利与土木工程学院
严新军 新疆农业大学 水利与土木工程学院
毛海涛 河北工程大学 水利水电学院
重庆三峡学院 土木工程学院
王正成 重庆三峡学院 土木工程学院
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中文摘要:
      堤(坝)基常出现互交的粗粒土层,具有代表性的主要由砂砾石层、细砂层和强透水砂砾石层组成,渗透时各土层微观的颗粒运移规律对于揭示堤(坝)基渗透变形和破坏机理至关重要,因此,采用三维颗粒流并结合“反演模拟法”,准确对颗粒细观参数进行了标定,有效的模拟了该多层堤(坝)基渗透变形的发展过程,获得了堤(坝)基渗透变形过程中的颗粒运移特点及颗粒流失情况。结果表明:渗透破坏主要发生在上部砂砾石层中,随着渗透破坏的持续发生,逐渐影响下部土层,该层中细颗粒在粗颗粒孔隙间移动而后逐渐流失,属于典型的管涌破坏。中间细砂层在上部砂砾石层管涌破坏后,其颗粒最先在管涌口正下方Z4区发生流失,其余区域颗粒流失相对较晚,且颗粒流失量均随着计算时间步的增加而增加,导致细砂层出现小范围的变形。随着计算时间的增加,上部砂砾石层的下沉量是逐渐增加的,当上部砂砾石层细颗粒流失达到一定程度,堤(坝)基发生破坏,将对上部建筑物产生重大危害。本研究为从微观角度认识多层堤(坝)基流渗透破坏提供了一定参考。
英文摘要:
      A typical multi-layer dam foundation composed of strong permeable gravel layer, fine sand layer and strong permeable gravel layer is calibrated accurately by using three-dimensional particle flow software (PFC3D) and "inversion simulation method", and the development process of seepage deformation of the multi-layer dam foundation is simulated effectively and the characteristics of particle movement and particle loss in the process of seepage deformation of the dike foundation are obtained. The results show that: The seepage damage mainly occurs in the upper gravel layer. With the continuous occurrence of seepage damage, it gradually affects the lower soil layer. The fine particles in the layer move between the pore of the skeleton particles and then gradually lose out, which is a typical piping failure. After the piping failure of the upper sand-gravel layer, the particles of the middle fine sand layer first lost in Z4 area just below the piping mouth, while the particles of the other areas lost relatively late, and the amount of particle loss increased with the increase of calculation time, resulting in small-scale deformation of the fine sand layer. With the increase of calculating time, the subsidence of the upper gravel layer is gradually increasing. When the loss of fine grains in the upper gravel layer reaches a certain extent, the embankment foundation will be damaged, which will cause great harm to the upper buildings. This study provides a reference for understanding the seepage failure of multi-layer embankment foundation flow from a micro-perspective.
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