大颗粒红砂岩高填方路基强夯加固理论与试验研究-中南大学学报.pdfVIP

第 39 卷第 1 期 中南大学学报自然科学版( ) Vol.39 No.1 2008 年 2 月 J. Cent. South Univ. (Science and Technology) Feb. 2008 大颗粒红砂岩高填方路基强夯加固理论与试验研究 郭乃正，邹金锋，李 亮，杨小礼，赵炼恒，但汉成 ( 中南大学 土木建筑学院，湖南 长沙，410075) 摘 要：假设夯坑周边隆起量较小，夯坑下土柱的侧向变形可忽略，夯坑的体积等于土体夯后孔隙减小的体积， 强夯前后土柱质量不变，按照体积相同的原则等效为一圆柱体，推导出大颗粒土体在夯击时其压实度、孔隙比与 有效影响深度的理论计算公式以及夯沉量、孔隙比、压实度与夯击能量之间的理论计算公式，利用这一理论对常 吉高速公路的路基加固进行施工设计。研究结果表明：理论计算结果与实测结果较吻合，证实了上述理论的有效 性；强夯后土体的压缩模量提高 15%，夯沉量随夯击次数的增加而逐渐减小。 关键词：红砂岩；强夯；夯沉量；压实度；孔隙比 中图分类号：TU 472 文献标识码：A 文章编号：1672-7207(2008)01−0185−05 Dynamic compaction theory and experiments in high roadbed filled with red sandstone GUO Nai-zheng, ZOU Jin-feng, LI Liang, YANG Xiao-li, ZHAO Lian-heng, DAN Han-cheng (School of Civil and Architectural Engineering, Central South University, Changsha 410075, China) Abstract: Based on the assumption that the upheaval around the tamper hole and the radial deformation was smaller, the tamper hole bulk equaled the reduction of small opening ratio after tamping, and the soil mass tamped was not changeable, the relationship between energy of tamper and settlement, compaction degree, small opening ratio was obtained. The formulation of the compaction degree and small opening ratio along the depth were given. The parameters of tamper construction design were confirmed. The reliability and validity of the tamper construction design was proved by a series of trail in local. The results show that compression modulus increases by 15%, and the tamping settlement decreases gradually with the increase of tamp times. Key words: red sandstone; dynamic compaction; settlement; compaction degree; small opening ratio 强夯法自 1