PDF《水下盾构隧道接缝渗漏规律的模型试验研究》

第38 卷第5期岩石力学与工程学报 Vol.

38 No.5

2019 年5月Chinese Journal of Rock Mechanics and Engineering May,2019 收稿日期:2018C09C18;

修回日期:2018C10C30 基金项目:海南自然科学基金面上项目(20165188);

国家自然科学基金地区科学基金项目(51868017) Supported by the Natural Science Foundation of Hainan Province of China(Grant No. 20165188) and National Natural Science Foundation of China(Grant No. 51868017) 作者简介:路平(1986C),男,2015 年于天津大学建筑工程学院获博士学位,现任讲师,主要从事土力学与隧道工程方面的教学与研究工作. E-mail:luping_haikou@hainu.edu.cn.通讯作者:张友良(1972C),男,现任教授.E-mail:zhangyouliang@hainu.edu.cn DOI:10.13722/j.cnki.jrme.2018.1106 水下盾构隧道接缝渗漏规律的模型试验研究 路平,陈灿,廖陈畅,张友良 (海南大学 土木建筑工程学院,海南 海口 570228) 摘要:为研究水下盾构隧道接缝处的渗漏规律,设计一套恒水压下盾构隧道渗漏的模型试验装置,对隧道拼装方 式、漏缝宽度及漏缝位置不同时的漏水漏砂规律进行试验研究,揭示渗漏对漏缝周围土体受力与变形的影响.试 验结果表明:临界缝宽几乎不受漏缝位置的影响,临界缝宽下漏水量不收敛且与渗漏方向有关,隧道拱腰处接缝 的漏水速率约为拱顶处的

2 倍;

而漏砂量在

4 min 内均已收敛且与应力土拱的形成有关,隧道拱脚处漏缝旁的土 压力增量最大,应力土拱最难稳定,其漏砂量约为拱顶处的

3 倍.漏砂的特征粒径从原始级配开始逐渐降低,最 终更小的颗粒被吸附在大颗粒骨架周围不再漏出,漏缝旁的土压力增幅约 60%,且土压力增量与渗漏砂C水质量 比正相关.拱脚漏缝渗漏时土体表层沉降最显著,错缝拼装渗漏时表层沉降的平均影响范围更广. 关键词:隧道工程;

盾构隧道;

模型试验;

土拱;

渗漏位置;

漏砂 中图分类号:U

45 文献标识码:A 文章编号:1000C6915(2019)05C0993C12 Model test on joint leakage in underwater shield tunnels LU Ping,CHEN Can,LIAO Chenchang,ZHANG Youliang (College of Civil Engineering and Architecture,Hainan University,Haikou,Hainan 570228,China) Abstract: In order to investigate the leakage law of underwater shield tunnel joints, a set of model test device was designed to observe the leakage process of shield tunnels under constant water pressure,and tests for the leakage law with different assembly patterns,leak widths and locations were carried out. The influence of the leakage on soil stress and deformation around the leak was also revealed. The experimental results show that the critical width of the leak is almost unaffected by the leak location. The water leakage under the critical width is non-convergent and related to the leakage direction. The leakage rate at the tunnel hance is about twice that at the tunnel vault. However,the sand leakage of all leaks is convergent within

4 min and is related to the formation of the soil stress arch. The increment of the soil pressure around the leak at the arch foot of the tunnel is the largest,the soil stress arch is the most difficult to stabilize,and the amount of sand leakage at the arch foot is about three times of that at the tunnel vault. The characteristic particle size of sand leakage decreases gradually from the original gradation, and eventually smaller particles are absorbed on the skeleton of large particles and no longer leak out. The soil pressure around all leaks increases by approximately 60%,and the increment of the soil pressure is positively related to the leaking sand-water mass ratio. The surface settlement is the most obvious when the tunnel arch foot is leaking,and the average influence range of the surface settlement is wider when the staggered pattern assembly tunnel is leaking. Key words:tunnelling engineering;