软土地区矩形隧道地表施工沉降的Peck公式修正

Improvement of Peck formula of surface construction settlement of rectangular tunnel in soft soil area

根据昆明某软土地区矩形隧道施工的实测数据,对Peck经验公式进行修正,得到修正后的Peck公式。根据浅埋暗挖法施工特点,提出修正的Peck公式分为左线和右线表达式,引进参数α_L和α_R对2类表达式中的开挖宽度D进行修正;同时引进参数β_R和β_L对左线和右线表达式中沉降槽的宽度系数i进行修正。经过修正后的Peck公式能很好地预测软土地区矩形隧道地表施工沉降。

According the measured data of rectangular tunnel in soft soil area of Kunming, the Peck empiricalformula was modified. In the light of the characteristics of constructing order, the modified Peck formula was putforward, which includes two formulas for the left and right line respectively, and parameters αR and αL wereintroduced to modify excavation width D in both formulas. Furthermore, parameters βR and βL were alsointroduced to modify width factor of settlement in left and right line formulas. The improved Peck formula canwell predict surface construction settlement of rectangular tunnel in soft soil area.