简易机场纤维格栅-水泥土基层使用性能研究

Research on Fiber Grid-Cement Soil Base Performance of Airstrip

为了分析适用于简易机场快速修建工程中的合理道面结构,通过大量的室内土工试验和足尺试验研究,对纤维格栅-水泥土应用于跑道基层的使用性能进行了研究.室内土工试验研究发现：水泥质量分数为10%和12%的水泥土7d干抗压强度可达3MPa左右,饱水抗压强度可达2MPa以上,7d水稳定性系数基本达到70%左右,表明水泥土早期强度较高,具有较好的强度特性和水稳定性.足尺试验结果表明：玻璃纤维格栅的铺设提高了道面结构整体回弹模量,最大增幅可达17.5%,各龄期的回弹模量可达190.68~435.08MPa;玻璃纤维格栅可使道面结构具有更大的荷载分布能力和更好的板体作用,并能够明显减少干缩裂缝产生和有效控制裂缝发展,在一定的通行次数内道面结构弯沉值小于1mm.通过对比试验表明,玻璃纤维格栅-水泥土基层具有较强的承载能力、较好的抗变形性和较高的整体性,能够满足简易机场的修建和使用需求.

In order to investigate the reasonable pavement structure for rapid construction of airstrip, the performance of fiber grid-cement soil runway base has been researched through a large number of inside geotechnical experiments and full scale tests. Inside geotechnical experiments results are shown to be as follows, the 7 d dry unconfined compression strength of 10% and 12%（by mass） cement soil reach around 3 MPa, while saturated unconfined compression strength reach up to 2 MPa, and the water stability coeffi- cient reach to 70%. It shows that, the strength characteristic and water stability of cement soil can satisfy the construct demand of airstrip. Full scale test results show that. glass fiber grid improves the holistic e- lastic modulus of pavement; significantly reduces the drying shrinkage crack and effectively controls the crack development. Holistic elastic modulus runs up to 190. 68 - 435.08 MPa at different periods, the in- crease margin up to 17.5%, and the rebound deflections less than 1 mm under ten thousands traffic times. Contrast test shows that glass fiber grid-cement soil base can meet the construction and operation require- ments of airstrip with strong bearing capacity, good deformation resistance, and high integrity.