砂砾地层电力顶管施工引起的地面变形研究

文章针对砂砾地层电力顶管施工引起的地面变形开展研究。首先,基于现有散粒土的沉降理论计算公式,进行某砂砾地层电力隧道顶管施工引起地面变形的理论计算和分析;其次,通过理论分析和现场实测,得到砂砾地层顶管施工引起的地面变形规律;最后,在现有理论计算公式和监测数据的基础上,利用规划求解,提出适用于砂砾地层顶管施工引起地面变形的沉降槽宽度系数计算公式。研究结果表明,土体损失是引起地面沉降的主要影响因素,沉降计算时必须考虑土体损失在顶进过程中的动态变化;修正沉降槽宽度系数计算公式能够较好地适用于砂砾地层中顶管施工引起的地面沉降计算。

Research on Ground Deformation Induced by Pipe Jacking Construction in Sandy Gravel Stratum

This paper discusses the deformation of ground surface induced by pipe jacking construction in sandy gravel stratum.Based on the existing theoretical calculation methods of deformation in granular soil,theoretical cal culation and analysis of ground deformation in sandy gravel stratum induced by pipe jacking construction in an elec tric power tunnel are conducted;the rules of ground deformation induced by pipe jacking construction in sandy grav el stratum are obtained through theoretical analysis and field monitoring;a formula for calculating the width coeffi cient of settlement trough induced by pipe jacking construction in sandy gravel stratum is put forward by using the programming solver based on the existing theory and monitoring data.The results show that ground loss is the main factor causing ground settlement and the dynamic changes of ground loss during pipe jacking must be considered in settlement calculation;the proposed formula can be used to calculate the ground settlement induced by pipe jacking construction in sandy gravel stratum.