纤维类材料改善膨胀土工程性能的适用性探讨

Applicability exploration of improving engineering properties of expansive soil with fiber materials

通过室内土工试验和数值模拟分析研究纤维类材料改良膨胀土的可行性和效果。结合室内试验结果,采用有限差分软件FLAC3D模拟均质膨胀土边坡和加FRP锚杆后的改良膨胀土边坡,并对二者进行了对比。室内土工试验表明,聚乙烯纤维能有效提高膨胀土的膨胀率和膨胀力以及显著降低纤维土的收缩性。数值模拟分析表明,纤维增强复合塑料能有效增加膨胀土边坡安全系数,减少滑动位移。

Through the indoor test and numerical analysis,the feasibility and effect of expansive soil improvement with fiber materials are analyzed.Combined with results of laboratory test,homogeneous expansive soil slope and expansive soil slope with FRP Anchor are simulated and compared using FLAC3D.Indoor test shows that Polyethylene fibers not only can improve the swelling rate and swelling pressure of expansive soil,but also reduce the shrinkage of soil with fibers significantly.Numerical simulation shows that FRP can effectively increase the safety factor of expansive soil slope and reduce the sliding displacement.