不同类型降雨边坡温湿耦合及稳定性数值模拟研究

为研究不同类型降雨条件下(平均型降雨，前锋型降雨，中锋型降雨以及后锋型降雨)广西南宁某地边坡温湿耦合特性以及边坡稳定性进行规律。利用加拿大著名岩土软件Geo-slope2012软件进行了有限元计算，计算结果表明：降雨条件下边坡表层孔压及体积含水量首先达到最大，然后逐渐向边坡深部发展，在降雨结束后，边坡表层的孔压及体积含水量迅速减小；在降雨过程中，边坡土体表层的孔压及体积含水量大小顺序为：后锋型降雨≥中锋型降雨≥平均型降雨≥前锋型降雨，深层的孔压及体积含水量大小顺序为：后锋型降雨≤平均型降雨≤中锋型降雨≤前锋型降雨；在降雨结束后，坡土体内部的孔压及体积含水量大小顺序为：后锋型降雨≥平均型降雨≥中锋型降雨≥前锋型降雨；边坡内部总的温度场与气候变化较为一致，呈现先增大后减小的规律；边坡内部的温度变化幅度要小于边坡表层，同时，下部监测面的温度变幅要小于上部监测面与中部监测面；安全系数总体上随时间呈现在降雨过程中逐渐减小，在降雨结束后保持不变的规律；不同降雨类型在降雨前期的安全系数大小排序为：后锋型≥平均型≈中锋型≥前锋型，最终安全系数趋于一个定值.

英文摘要:

In order to study the temperature and humidity coupling characteristics and slope stability of a certain slope in Nanning Guangxi under different rainfall conditions(average rainfall front rainfall center front rainfall and post front rainfall).The finite element calculation of Geo-slope 2012，a famous geotechnical software in Canada，is carried out.The results show that：Under rainfall condition，the pore pressure and volume water content of the surface layer of the slope reach the maximum at first，and then develop to the depth of the slope gradually.After the rainfall，the pore pressure and the volume water content of the surface layer of the slope decrease rapidly.The order of pore pressure and volume water content in the surface layer of slope soil is as follows：posterior front rainfall ≥ center front rainfall ≥ average rainfall ≥ front rainfall.The order of pore pressure and volume water content in the deep layer is as follows：posterior front rainfall ≤ average rainfall ≤ center front rainfall ≤ front rainfall.After the end of rainfall，the order of pore pressure and volume water content in slope soil is as follows：posterior front rainfall ≥ average rainfall ≥ center front rainfall ≥ front rainfall.The total temperature field in the slope is consistent with the climate change，which increases first and then decreases，and the range of temperature change in the slope is smaller than that in the surface of the slope，and the temperature variation of the lower monitoring surface is smaller than that of the upper monitoring surface and the central monitoring surface.The safety coefficient gradually decreases with time in the rainfall process，and keeps constant after the rain.The safety coefficient of different rainfall types in the early period of rainfall is：the rear front type more than average type center type or more forward type，and the final safety factor tends to a fixed value.

查看全文查看/发表评论下载PDF阅读器

关闭