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Experimental Study on Stratigraphic Subsidence Induced by Sand Leakage in Tunnel Lining Cracks
KSCE Journal of Civil Engineering ( IF 2.2 ) Pub Date : 2020-06-22 , DOI: 10.1007/s12205-020-1958-1
Zhongchang Wang , Guodong Li

In order to study the problem of strata subsidence caused by sand leakage in tunnel lining cracks in sandy soil, a set of sand (water) leakage visualization test system for underground engineering which could change the size of circular leakage opening was designed. The sand flow pattern under different working conditions was obtained. It was shown that the sand inrush process could be divided into four stages: initial stage, induced stage, diffusion stage and stable stage. The influence of the diameter of the leakage opening and the thickness of soil layer on the sand inrush and the sandy soil subsidence was studied. When the diameter of the sand leakage opening was same, the influence range of the subsidence increased with the increase of the thickness of soil layer. When the thickness-to-span ratio reached 21.4, the sand layer only subsided. No sand inrush occurred. When the thickness-to-span ratio continued to increase to 25.7, the sand layer did not subside. When the thickness of the sand layer was same, the diameter of the columnar region in the vertical subsidence zone increased with the increase of the diameter of the sand leakage opening. The subsidence range induced by the circular sand leakage opening was rounded on the top plane, and the quadratic surface was approximated on the section. The subsidence range of the soil was related to the shape failure angle of the collapsed surface. The shape failure angle of the collapsed surface was about 13° larger than the natural angle of repose of the soil. This provided a reference for the prevention and control of stratigraphic subsidence caused by the sand leakage of tunnel lining cracks in sandy soil layers.



中文翻译:

隧道衬砌裂缝中漏砂引起的地层沉降试验研究

为了研究砂土隧道衬砌裂缝中漏砂引起的地层下沉问题,设计了一套可以改变圆形漏孔尺寸的地下工程漏砂可视化测试系统。得到了不同工况下的流沙规律。结果表明,喷沙过程可分为四个阶段:初始阶段,诱导阶段,扩散阶段和稳定阶段。研究了泄水口直径和土层厚度对沙尘暴和沙质地面沉降的影响。当漏砂口直径相同时,沉降的影响范围随土层厚度的增加而增大。当厚度与跨度之比达到21.4时,沙层仅消退。没有沙粒涌入。当厚度与跨度之比继续增加到25.7时,砂层没有沉降。在砂层厚度相同的情况下,垂直沉降区域的柱状区域的直径随着漏砂口的直径的增加而增加。由圆形漏砂孔引起的沉降范围在顶平面上取整,并在剖面上近似二次表面。土壤的沉降范围与塌陷表面的形状破坏角有关。塌陷表面的形状破坏角比土壤的自然休止角大约13°。这为砂土层隧道衬砌裂缝的漏砂引起的地层沉降的防治提供了参考。当厚度与跨度之比继续增加到25.7时,砂层没有沉降。在砂层厚度相同的情况下,垂直沉降区域的柱状区域的直径随着漏砂口的直径的增加而增加。由圆形漏砂孔引起的沉降范围在顶平面上取整,并在剖面上近似二次表面。土壤的沉降范围与塌陷表面的形状破坏角有关。塌陷表面的形状破坏角比土壤的自然休止角大约13°。这为砂土层隧道衬砌裂缝的漏砂引起的地层沉降的防治提供了参考。当厚度与跨度之比继续增加到25.7时,砂层没有沉降。在砂层厚度相同的情况下,垂直沉降区域的柱状区域的直径随着漏砂口的直径的增加而增加。由圆形漏砂孔引起的沉降范围在顶平面上取整,并在剖面上近似二次表面。土壤的沉降范围与塌陷表面的形状破坏角有关。塌陷表面的形状破坏角比土壤的自然休止角大约13°。这为砂土层隧道衬砌裂缝的漏砂引起的地层沉降的防治提供了参考。

更新日期:2020-07-14
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