摘要
根据顶管工程中矩形沉井工作井后背墙变形情况,假定后背墙在顶管反力作用下变形为抛物线形,提出采用与位移有关的土压力来计算土体反力。考虑了沉井底部和侧壁的摩阻力,由沉井整体水平向受力平衡计算允许顶力。通过算例与朗肯理论的比较结果表明,提出的方法可用于计算土体的非极限被动土压力,且该方法考虑了顶管反力这一局部荷载对墙后土压力分布的影响。
Under the counterforce on the rectangular open caisson working well during pipe jacking, the backwall displacement curve was assumed to be parabolic and the relation between the displacement and earth pressure was used to calculate the earth counterforce. Then considering the friction forces on the well sides and well bottom, the permissible jacking force was calculated through the horizontal forces balance of the whole working well. Through an example comparing the new method with Rankine theory, it was shown that the new one can calculate the earth pressure at the unpassive state and considers the effect of the local force on the earth pressure distribution on the backwall.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2005年第7期1127-1131,共5页
Rock and Soil Mechanics
关键词
顶管
矩形沉井
允许反力
位移
Caissons
Calculations
Friction
Pipe
Pressure
Pressure distribution
Rankine cycle
