摘要
工程实际中软土路基工后沉降值的确定一般是先根据现场实测的软基沉降-时间变化过程曲线推算出最终沉降量,再减去已发生的沉降量即得到工后沉降量。实际上,由于地基条件、加固方式及效果的不同,仅仅根据路基施工期较短时间的沉降与时间的变化曲线来直接推算时间趋于无穷大时的最终沉降量,这种计算方法有欠合理,推算出的工后沉降有时与实际相差较大。因此,提出了一种沉降预测的新方法,即利用回旋线的曲率变化特性来分析软基沉降变化规律,用回旋线参数方程来直接推算工后沉降量,并详细研究了回旋线参数A值和沉降收敛时间t值的求解方法,结果表明,用回旋线参数方程来推算软土路基工后沉降量方法快速、简单、直接。
In actual projects, it＇s usually to calculate the soft soil roadbed＇s post-construction ultimate settlement firstly according to the actual curve diagram of settlement and time, then removes the settlement which is exist, and the rest is the postconstruction settlement. Because of the difference of ground condition and the method and effect of strengthening, it＇s not rational to calculate the ultimate settlement when time tends to infinity just according to the actual curve diagran＇t of settlement and time which is got during the soft soil roadbed＇s construction in short-term, and the caculated post-construction settlement is sometimes different to the actual post-construction settlement greatly. So this paper presents a new method to predict the settlement which analyses the rule of soft soil roadbed＇s settlement according to curvature change of clothoid and caculates the postconstruction settlement based on the parameter equation of clothoid directly. And this method detailedly studied and obtained the solution of the parameters A of clothoid and the convergence settlement time t. Results show that the method to caeulate soft soil post-construction settlement based on clothoid parameter equation is fast, simple and direct.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第1期63-67,共5页
Journal of Wuhan University of Technology
关键词
软土路基
工后沉降
回旋线
soft soil roadbed
post-construction settlement
clothoid
