软土路基沉降规律三维有限差分模拟及分析

Three-dimensional finite difference scheme simulation and empirical analysis of settlement law of soft soil subgrade on xincheng yangyang line

针对在软土路基段新建高速公路沉降大的缺点,为了研究新建高速公路在软土地质区域的沉降分布规律,本文以新澄杨线为研究对象,借助FLAC三维有限差分计算软件,采用数值模拟计算了实例工程的沉降分布,研究了实例工程天然路基段和复合路基段的分布规律,并基于实测资料进行计算精度对比。本文研究结果显示:①对天然路基段和复合路基段的沉降分布计算都较为精确,计算误差率在10%以内的数据点分别占86.0%与82.3%;②虽然复合路基段的地质条件比天然路基段要恶劣,但通过水泥搅拌桩加固等方法处理后,沉降值要远小于天然路基段,加固方式合理有效。

Aiming at the disadvantage of large settlement of new expressway in soft soil subgrade section,in order to study the settlement distribution law of soft soil region in new expressway taking the new cheng yang line as the research object,using FLAC 3D finite difference scheme calculation software,the numerical simulation is used to calculate the example project settlement distribution,the distribution law of natural subgrade and composite subgrade of the example project is studied,and the calculation accuracy based on the measured data are compared.The research results show that:①the settlement distribution calculation of natural subgrade and composite subgrade is relatively accurate,and the data points with the error rate within 10% account for 86.0% and 82.3% respectively.②although the geological condition of composite subgrade is worse than that of natural subgrade,the settlement value is much smaller than the natural subgrade after the treatment of cement mixing pile reinforcement.The reinforcement method is reasonable and effective.