作　　者： ; ; ;

机构地区： 长安大学公路学院陕西省公路桥梁与隧道重点实验室

出　　处： 《四川大学学报（工程科学版）》 2013年第4期39-45,共7页

摘　　要： 鉴于目前黄土公路隧道修筑面临的一些特有问题,为了更全面地了解双洞效应影响下黄土公路隧道地层变形规律,运用离心模型试验设备,系统开展了4组基于先加载后开洞思路的模型试验,研究了双洞不同净距对黄土公路隧道地层变形的影响。试验结果表明:随着双洞净距的增大,双洞间的相互影响程度减弱,靠近拱顶处的地层变形曲线由单峰值的V形逐步变为双峰值的W形;存在压力拱效应且压力拱的形成高度随双洞净距的增大而增大;先行洞室各层沉降范围及沉降值均略大于后行洞室,且随双洞净距的增大,先行洞室对后行洞室的影响程度逐渐减弱;选用0.5D间距形式,易在隧道间形成应力与变形强影响区,需对中间土体进行加固,选用D及以上间距形式,隧道间可以形成自稳的宽底承载土柱体,故小净距黄土公路隧道双洞间合理净距可选取为D。 In order to understand the stratum deformation rule of loess road tunnel under the influence of double-hole effect more comprehensively,four groups of model tests were carried out systematically with the centrifuge model test device,based on the thinking of first loading and then punching,and the influence of different double-hole clear distances on the stratum deformation of the loess road tunnel was researched.The test results showed that with the increase of double-hole spacing,the degree of the mutual influence between two holes will recede,and the stratum deformation curve close to the vault changes from single peak ＂V＂ shape to double peak ＂W＂ shape gradually.There exists the pressure arch effect,and the formation height of the pressure arch increase with the increase of double-hole clear distance.The sedimentation range and the sedimentation value of each layer of the anterior hole are larger than those of the subsequent hole,and the influence degree of the anterior hole on the subsequent tunnel will recede gradually with the increase of double-hole spacing.Selecting 0.5D spacing form,the stress and deformation influence area between holes forms easily,so it’s necessary to reinforce the middle soil;selecting D spacing form and above,the steady wide-base bearing soil column between holes can form,so the reasonable spacing between two holes of closely spacing loess road tunnel can be D.

关 键 词： 黄土隧道 双洞效应 地层变形 模型试验

领　　域： [建筑科学] [交通运输工程]