隧道沉降缝中埋式和可卸式防水构造试验与数值模拟对比分析

Experimental and Numerical Simulation Comparative Analysis of Buried and Detachable Waterpro of Structures in Tunnel Settlement Joints

为了探寻替代中埋式止水带的复合防水构造,对中埋式+背贴式和可卸式+背贴式2种试件进行了力学试验,并通过数值模拟分析了沉降缝宽20、25、30 mm时2种试件的力学性能,得到了荷载-竖向位移曲线。研究结果表明:沉降缝宽25 mm的试件极限承载力和最大抗剪强度均最大;防水构造形式相同、沉降缝宽不同时,极限竖向位移值差别很小,当缝宽相同时,可卸式+背贴式试件的极限竖向位移值普遍大于中埋式+背贴式试件;3种不同的沉降缝中,中埋式+背贴式试件的力学性能差异更显著,而可卸式+背贴式试件的力学性能差异较小。

In order to explore a composite waterproof construction,mechanical tests were conducted on two types of specimens:the middle buried+back attached and the detachable+back attached.The mechanical properties of the two specimens were analyzed by numerical simulation when the settlement joint width was 20,25,and 30 mm.The load-vertical displacement curve was obtained.The research results indicate that the specimen with a settlement joint width of 25 mm has the highest ultimate bearing capacity and the maximum shear strength;The difference in the ultimate vertical displacement value is very small when the waterproof construction form is the same and the settlement joint width is different.When the joint widths are same,the ultimate vertical displacement of the detachable and back attached specimens is generally greater than that of the buried and back stick specimens;Among the three different settlement joints,the difference in mechanical properties between the embedded and back attached specimens is more significant,while the one between detachable and back attached specimens is relatively small.