【作者】 张莹；

【导师】 黄才安； 汤正军；

【作者基本信息】 扬州大学 ， 水利工程（专业学位）， 2019， 硕士

【副题名】以江都建都路拓宽改造工程为例

【摘要】 利用堤防作为公路,是水利工程堤防中经常会遇到的,因此兼作公路的临河堤防的稳定性的研究就显得相当必要。本文利用极限平衡理论和有限元方法,分别研究了江都区建都路扩宽改造工程中利用芒稻河堤防作为公路情况下,堤防的稳定性。1、对施工期和水位骤降两种情况,采用总应力法计算了堤防抗滑稳定安全系数,得到:各种工情、工况下最小稳定安全系数均大于3级堤防正常工况允许值K允=1.20,非常工况允许值K允=1.10,满足规范要求。其中公路实施后,因芒稻河堤顶压力增加,堤防边坡临水侧的抗滑稳定安全系数有下降,但仍符合规范要求。2、利用有限元模型,对两种典型堤防断面,研究了车辆动荷载对边坡稳定的影响,得到:(1)对江都区建都路,在原芒稻河河堤以及堤顶建都路改造后堤段公路运行期车辆动荷载对建都路段改建后路堤的位移影响很小,堤顶由车辆动荷载产生的最大位移在1.1mm左右。在车辆动荷载作用过程中,建都路路堤内部各应力分量的最大值不超过0.09MPa,不至于对堤防产生不良影响。(2)通过平面有限元分析,车辆动荷载对公路路基边坡的稳定安全系数有一定影响,最小稳定安全系数减小量最大可达1.011;其中车辆动荷载对向河侧公路边坡的稳定安全系数减小量达1.011,对向陆地侧最小稳定安全系数减小量达0.301;车辆动荷载对芒稻河边坡稳定性的影响可以忽略。3、两种边坡稳定计算方法得到的结果是吻合的。总体上在考虑或不考虑车辆动荷载条件下,本路段初步设计的道路边坡是稳定的,满足规范安全性要求。更多还原

【Abstract】 It is often encountered in water conservancy engineering levees to make use of levees,so it is necessary to study the stability of riverside levees.Based on the limit equilibrium theory and finite element method,the stability of the embankment under the condition of using the Mandao River embankment as the highway in the widening and rebuilding project of Jiandu Road in Jiangdu District is studied in this paper.1.In the case of construction period and sudden drop of water level,the total stress method is used to calculate the safety factor of embankment anti-slide stability,and the results are as follows:the minimum safety factor of stability is greater than 3 grade under all kinds of working conditions,allowable value K under normal working condition isl.20,allowable value K under abnormal working condition is 1.10,which meet the requirements of the specification.After the implementation of the highway,because of the increase of the pressure on the top of the river embankment,the safety factor of anti-slide stability of embankment slope near the water side is decreased.The safety factor of anti-slide stability of embankment slope near the water side is decreased.2.Using finite element model,the influence of vehicle dynamic load on slope stability is studied for two typical embankment sections,and the results are as follows:(1)For Jiandu Road in the Jiangdu District,after the reconstruction of the original Mandao river embankment and the main road of the embankment,the effect of vehicle dynamic load on the displacement of embankment after reconstruction of embankment is very small during the running period of embankment.And the maximum displacement of the top of the embankment caused by the vehicle dynamic load is about 1.1mm.In the course of vehicle dynamic loading,the maximum value of each stress component in the embankment of Jiandu Road is not more than 0.09MPa,so it is not harmful to the embankment.(2)Through the plane finite element analysis,the vehicle dynamic load has certain influence on the stability safety factor of the highway roadbed slope.The minimum stability safety factor can be reduced to 1.011;The reduction of the safety factor of vehicle dynamic load to the slope of the riverside highway by 1.011.And the minimum stability safety factor to the opposite land side decreases by 0.301;The effect of vehicle dynamic load on the slope stability of Mandao River can be neglected.3.The results obtained by the two methods are in good agreement.In general,under the condition of considering or not considering the dynamic load of the vehicle,the preliminary design of the road slope in this section is stable and meets the safety requirements of the code.更多还原