摘要
对盾构法隧道施工引起的土体扰动范围进行了分析,根据极限平衡原理,认为Loganathan公式中假定的土体损失边界条件存在误差。考虑到土体内摩擦角对土体移动的影响,认为垂直土体变形区域边界线的水平倾角应等于(45°+?/2),而不是45°。给出了修正的Loganathan公式,该公式适用于软土地区不排水条件。提出了盾构剪切扰动区范围的计算公式。算例分析表明,与Loganathan公式的计算结果相比,修正公式使沉降槽宽度和土体水平位移有所减小,计算结果与实测数据更加吻合。
The extent of soil disturbance induced by shield tunneling construction is analyzed, It is considered that the assumed boundary condition of ground loss in Loganathan＇s formula exists error based on the principle of limit equilibrium, The influence of internal friction angle on ground movements is taken into account. It is considered that the level obliquity about boundary line of the vertical ground formation region should be （45 ° ＋φ/2）, but not 45 ° . The modified Loganathan＇s formula is presented, which is only applicable under the undrained condition in clays. At the same time, the calculation for the extent of the cut disturbance of shield is advanced for the first time. As shown by analytical calculation for a project case, the proposed new approach tends to decrease the width of surface settlement troughs and horizontal ground displacements; and the results are more accordant with the field observations when compared with results of Loganathan＇s formula.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第6期995-999,共5页
Rock and Soil Mechanics
关键词
盾构隧道
土体扰动
土层移动
沉降
土体损失
shield tunneling
disturbance of soil
ground movements
settlement
ground loss
