邻近管线渗漏对土钉支护体系安全性的影响  

Effects of Nearby Pipeline Leaking on Safety of Soil Nailing Retaining System

作　　者：王辉[1] 程建华[1] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454003

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第1期102-108,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(41072224)

摘　　要：目的为更深入地研究基坑周边邻近地下管线渗漏对土钉支护体系安全性的影响,为工程设计及应用提供参考.方法针对某一具体失事工程,结合ABAQUS有限元软件,通过建立数学模型,分析不同入渗位置对土钉轴力、坑壁侧移及整体安全系数的影响规律.结果在入渗深度与宽度保持不变的条件下,假定入渗后的土体处于完全饱和状态,模拟结果表明入渗范围内的土钉轴力所受影响较大,且随着入渗位置逐渐远离基坑开挖面,土钉轴力的最大值逐渐向远离开挖面的方向移动;坑壁侧移先增大后减小,存在突变点;整体安全系数先减小后增大,在土钉末端入渗时,达到最小值,处于最危险状态.结论邻近管线渗漏位置对土钉支护体系的安全性影响较大,尤其是土钉末端,连接着土钉墙与后部土体,是管线渗漏时的薄弱环节,在结构设计时应充分探明管线位置,针对危险点加强防护措施.In order to give references for design and application of foundation engineering, effects of pipeline leaking nearby on safety of soilnailed retaining system were studied in this paper. For an engineering accident example, a numerical model based on commercial software ABAQUS was built and effects of different infiltration locations on the axial forces of soil nails, horizontal dis placements and the total safety factor were analyzed. Simulated results show that with the same depth and width of infiltration area and assumption that the soil in leaking area is in the completely saturated state, axial forces of soil nails located in the leaking area are affected more obviously. It is found that when the infiltration position is gradually away from the excavation surface, the maxi mal axial force of soil nails has the same movement tendency ; the horizontal displacement increases firstly and then decreases and a mutation point is observed. The total safety factor decreases firstly and then increases. When the infiltration position is near the end of soil nail, the safety factor isminimum and the retaining system is in dangerous state. It indicates that the reliability of soil nailed retaining system is affected greatly by the location of nearby pipeline leaking. Especially the position of the end of soil nail, where soilnailed wall and rear soil are connected, is a weak point when pipeline leaking happens. This position should be regarded as a design emphasis and strengthened by protective measures.

关 键 词：土钉支护 管线渗漏 土钉轴力 安全性 

分 类 号：TU476[建筑科学—结构工程]