摘要
基于3D打印技术构建了高铁隧道结构及排水系统设施精细模型,提出了切实可行的隧道堵管模拟方法及模拟装置,依托典型病害案例开展了堵管病害相似模型模拟试验,探讨了在不同堵管条件、不同地层水头下隧道渗流场(隧道排水量、结构外水压力)及结构位移量的变化规律特征。研究结果表明:随堵塞程度加深,隧道排水量呈现先慢后快型下降趋势,具体为排水管堵塞率为50%前隧道排水量下降幅度较小,而堵塞率达50%后隧道排水量骤减直至不排水;底部结构隆起位移存在"隧底>内轨>外轨"的量值关系,且随堵塞程度加深隆起位移呈现先慢后快型增长趋势;受排水减少影响,堵管后结构外水压力逐步由"隧底最大,拱顶、拱腰次之,墙脚最小"的扇贝型分布转为"静水压"型分布;至全堵条件下地层水头40 m时试验位移结果与现场病害特征吻合良好,验证了上述模拟方法的可行性与有效性。研究成果以期为富水隧道堵管防治及类似病害评价提供借鉴与指导作用。
Based on 3 D printing technology, a fine model for high-speed railway tunnel structure and drainage facilities is constructed, and a feasible simulation method for drainage clogging is put forward. Based on a typical disease case, a simulation test on drainage clogging is carried out, and under different conditions of drainage clogging and groundwater level, the seepage field(including drainage volume and external water pressure) and structural deformation are discussed. The results show that with the deepening of blockage, the drainage volume shows a slow downward trend and then a fast downward trend, and specifically, when the drainage pipe blockage is less than 50%, the tunnel drainage decreases slightly, and when the blockage is more than 50%, the tunnel drainage decreases sharply until no drainage occurs. The displacement of bottom structure uplift has the quantitative relation of "tunnel bottom > inner rail > outer rail", and with the increase of blockage degree, the uplift displacement slowly grows first and then fast grows. Affected by the reduction of drainage, the external water pressure of the structure gradually changes from "the maximum at the bottom, next at the crown and waist of the arch, and minimum at the foot of the wall" to the "hydrostatic pressure" distribution. The test results of displacement coincide well with the characteristics of field defects when the water head is 40 m and the drainage pipe is fully blocked, which verifies the feasibility and validity of the proposed simulation method. The research results may provide reference and guidance for prevention of pipe plugging and evaluation of similar defects of water-rich tunnels.
作者
李林毅
阳军生
高超
王树英
王子建
相懋龙
LI Lin-yi;YANG Jun-sheng;GAO Chao;WANG Shu-ying;WANG Zi-jian;XIANG Mao-long(School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第4期715-724,共10页
Chinese Journal of Geotechnical Engineering
基金
高铁联合基金项目(U1934211)
国家自然科学基金项目(51878669)
新疆维吾尔自治区重大科技专项(2018A03003)
中央高校基本科研业务费专项资助项目(2019zzts291)。
关键词
排水管堵塞
高铁隧道
仰拱隆起
渗流场
模拟试验
3D打印技术
drainage clogging
high-speed railway tunnel
invert heave
seepage field
simulation test
3D printing technology
