土工格栅加筋土挡墙在土木工程中应用广泛，土工格栅的加筋作用以及筋材在挡墙设计中的计算需要进一步完善．利用FLAC3D有限元分析软件，对未设置和设置土工格栅加筋体的粉煤灰挡墙进行数值模拟分析，研究土工格栅的加筋作用对粉煤灰挡墙稳定性的影响，得到土工格栅加筋挡墙的设计参数．数值模拟结果表明：粉煤灰挡墙高度大于6ITI时，安全系数偏低，需要在粉煤灰挡墙中加筋来提高其安全系数，保证挡墙的稳定性．对墙高为8m的土工格栅粉煤灰加筋挡墙进行模拟分析，当增大加筋间距时，挡墙的侧向和竖向位移都增大，挡墙的最大竖向位移发生在挡墙的上部，最大侧向位移发生在挡墙中下部位；墙高为8m的土工格栅粉煤灰挡墙的合理加筋间距为0．8m%The geogrid-reinforced retaining wall is widely used in civil engineering The role of geogrid reinforcement and the calculations of reinforcement material in the retaining wall design need further refinement. This paper does an analysis of the numeral simulation of the fly ash retaining wall with and without reinforcement by using the finite element software of FLAC3D and studies the impact of geo- grid-reinforced function on the stability of the fly ash retaining wall so as to get the design parameters of the geogrid-reinforced fly ash retaining walk The numerical results show： the safety factor of the fly ash retaining wall is lower when its height is greater than 6 ms, therefore, the reinforcement is needed for the fly ash retaining wall to improve its safety factor and ensure the stability of the retaining wall. It simulates and analyzes the 8 ms high geogrid reinforced fly ash retaining wall, and the results show： increasing the reinforcement spacing can increase the lateral and vertical displacement of the geogrid re- inforced fly ash retaining wall, the maximum vertical displacement of the retaining wall lies in the up- per wall and the maximum lateral displacement occurs in the lower parts of the retaining wall; the rea- sonable distance of 8 ms high fly ash retaining wall is 0. 8
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