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提出石灰改良土工格栅加筋法处治高液限土拓宽路基。通过室内试验得到高液限土、高液限石灰改良土以及其土工格栅加筋土的基本力学特性,通过现场试验研究土工格栅和结合界面处土应变、新旧路基沉降以及沉降差,同时与高液限土土工格栅、普通填筑方法进行了对比研究。研究表明:石灰改良能够改变高液限土粒径级配,有效降低高液限土含水量、塑性指数,显著提高CBR值;土工格栅提高其抗压和抗剪强度;石灰改良土工格栅处治高液限土拓宽路基能够有效减少新老路基沉降和差异沉降,以及新老路基结合处的土应变,从而有效控制拓宽路基的结合部位开裂和不均匀沉降。
Proposed lime improved geogrid reinforcement method to treat high liquid limit soil to broaden the roadbed. The basic mechanical properties of high liquid limit soil, high liquid limit lime modified soil and their geogrid reinforced soil were obtained through laboratory experiments. The soil geogrids and the interface between the geogrid and the interface were studied through field tests, And high liquid limit geogrid, ordinary filling methods were compared. The results show that the lime modification can change the particle size distribution of high liquid limit soil, effectively reduce the water content and plasticity index of high liquid limit soil, and increase the CBR value remarkably. The geogrids increase the compressive strength and shear strength, The treatment of high liquid-limit soil widening roadbed can effectively reduce the settlement and differential settlement of new and old subgrade as well as the soil strain at the junction of new and old subgrade so as to effectively control cracking and uneven subsidence at the joint of widening subgrade.