高填方加筋土边坡稳定性试验与数值模拟研究

Experimental and numerical simulation study on stability of high fill reinforced soil slope

针对高填方加筋土边坡稳定性的计算与评价合理性问题,设计了边坡破坏模型试验,并基于试验结果对考虑加筋土的通用有限元软件计算合理性进行了验证,开展了广西某机场60 m高填方加筋土边坡填方层数变化对边坡稳定性的影响分析。结果表明:数值模拟中破坏面与水平面的夹角与模型试验结果基本一致,在通用有限元软件中考虑加筋土的方式可用于实际高填方加筋土边坡稳定性分析;虽然3层和5层填方方案的机场高填方加筋土边坡整体安全系数与4层方案总体相近,但易在加筋土后方形成剪应变增量贯通区,无法有效发挥加筋土强度特性,边坡存在整体失稳风险,因此设计的四层填方方案相比最优。研究成果可为类似高填方加筋土边坡稳定性的计算与评价提供技术支撑。

Aiming at the rationality of calculation and evaluation of the stability of high fill reinforced soil slope,the model test of slope failure was designed.Based on the test results,the rationality of the calculation of the general finite element software for the slope model considering the reinforced soil was verified,and the influence of the change of the number of filling layers on the stability of the 60 m high filled reinforced soil slope at an airport in Guangxi Province was analyzed.The results showed that the angle between the failure plane and the horizontal plane in the numerical simulation was basically consistent with the model test results,and the method of considering the reinforced soil in the general finite element software could be used for the stability analysis of the actual high fill reinforced soil slope.Although the change of overall safety factor of the airport high fill reinforced soil slope with 3-layer or 5-layer filling scheme were close to that of the 4-layer scheme,the shear strain increment through zone was easy to form behind the reinforced soil in the 3-layer or 5-layer filling scheme,which could not realize the strength characteristics of the reinforced soil effectively,and the slope had the risk of overall instability.Therefore,4-layer scheme was relatively better.The research results can provide a technical support for the calculation and evaluation of the stability of similar high-fill reinforced soil slopes.