摘要
以大连地铁5号线地区盾构施工为背景,研究了在穿越上软下硬地层时盾构施工引起的地表沉降。运用线性回归和实测数据相结合的方法研究了盾构隧道掘进过程中地表沉降的规律,在Peck公式中引入最大地表沉降修正系数α和沉降槽宽度修正系数β对公式进行修正,使其适用于大连地区上软下硬地层中盾构施工的地表沉降预测。结果表明,当α、β的取值范围分别为0.249~0.612和0.551~0.739时,修正后的Peck公式预测曲线与原始Peck公式曲线相比误差更小,预测结果更可靠。
The given paper intends to present a Peck formula limitation in predicting the geological surface subsidence to be caused by the tunnel excavation in prediction of the upper soft but lower hard geological formation. As compared with the predicted value of the Peck formula,there exists some error in the actual status-in-situ of the surface settlement. Therefore,the Peck formula needs to be rectified. And,so,in combination with the linear regression method,we have traced and examined the regularity of the surface settlement in the process of shield tunneling. And,thus,we have obtained the linear regression curve of the formula through the linear regression analysis of the Peck formula. And,then,the regression analysis of the measured settlement data also helps us to gain the linear functions of each monitoring section,confirming that the linear function through regression tends to be well fitted with the measured data. And,then,the aforementioned measured data prove to be evenly distributed near the linear function after regression,which can well represent the relationship between the two data. And,what is more,in the Peck formula,the 2 correction coefficients can be introduced to modify the original formula. Moreover,the correction coefficients serve as the maximum surface settlement correction coefficient αand the correction coefficient β of the settlement groove width,correspondingly and respectively. Thus,the revised Peck formula can be taken to be adopted for predicting the surface settlement of the shield construction in Dalian district with the underground strata situation being upper-soft and lower-hard. That is to say,our study has confirmed that,when the values of α and β range from 0. 249 to 0. 612 and 0. 551 to 0. 739,the difference should be minor enough between the fitted curve of the measured data and the predicted curve as a result of the Peck formula correction. And,through such a comparison with the original Peck formula curve,the error of the predicted curve of the modified Peck formula tends to be minor and has confirmed that the predicted result of the ground settlement tends to be more reliable. Hence,the relevant conclusions of the given paper prove to be of great significance in leading to the construction of such shield tunnels in the strata of upper soft and below hard geological structure.
作者
贾宝新
高宗贤
惠鹏飞
JIA Bao-xin;GAO Zong-xian;HUI Peng-fei(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Institute of Geology,China Earthquake Administration,Beijing 100000,China;Xi'an Railway Engineering Co.,Ltd.of China Railway Seven Group,Xi’an 710000,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2021年第3期1083-1088,共6页
Journal of Safety and Environment
基金
辽宁工程技术大学学科创新团队资助项目(LNTU20TD08)。
关键词
安全工程
地表沉降
盾构法
PECK公式
上软下硬地层
safety engineering
surface settlement
shield method
formula of Peck
upper-soft and lower-hard ground
