武广高铁红黏土地基沉降计算方法研究

Research on Computation Method for Settlement of Red Clay Foundation of Wuhan-Guangzhou Passenger Dedicated Line

研究目的:高速铁路对地基沉降的控制标准非常严格,为保障轨道的高平顺性,要求工后沉降达到15 mm以内,相当于零沉降的要求。武广高铁沿线分布有100多公里的红黏土,红黏土作为一种典型的特殊土,工程特性有别于常规土体,查明红黏土的变形沉降特性,获取适用于武广高铁红黏土地基的沉降计算方法,可为采取合理的措施保证高速铁路的地基沉降在控制标准之内提供依据,并具有重要的工程应用价值。研究结论:(1)建立了适用于红黏土地基沉降计算的分层总和法;(2)将该方法应用于沿线红黏土地基沉降计算,与基于监测资料的沉降预测值基本相当,(3)该方法适用于武广高铁红黏土地基沉降计算,并可为类似工程提供参考和借鉴。

Research purposes： The high-speed railway has high request for its foundation settlement and it requests the post-construction settlement of the foundation to be controlled below 15mm in order to ensure the track regularity.The red clay of 100km is spread along the railway.As a special soil,the engineering characteristics of red clay is very different from the normal soil.To find out the settlement characteristics of the red clay and the settlement calculation method can provide the basis for taking the reasonable measures to control the foundation settlement in the standard range,with an important engineering value. Research conclusions：（1） The modified layer-wise summation method applicable to calculation of the red clay foundation settlement was offered by modifying the calculation formula of the layer-wise summation method on consideration of the influencing factors of the settlement correction coefficient,excavation disturbance and settlement completion rate.（2） This methods was approved reliable by comparing the settlement calculated value obtained by this method with the settlement monitoring data.（3） It showed this method was suitable for calculation of the foundation settlement of Wuhan-Guangzhou Passenger Dedicated Line and may provide a useful reference to the similar engineering.