Abstract:The construction of city-connected high-speed railway in Northeast China has confronted a difficult problem in improving the bearing capacity of soft soils. The construction interval is in a small basin. The thickness of the silty clay is from 0.4 m to 9.6 m. There exists irregular size of erratic stones, the diameter of the stone is from 0.2 m to 2 m. The volume fraction of the stone is around 15%~20%. The drilling tool is prone to be broken when the bit meets silty clay, and the pile hole is easy to be inclined. It is technically poor and the economic feasibility is low. This problem is solved by applying the dynamic compaction replacement technology in reinforcing the stone subgrade of high-speed railway. By using the improved technology, a steady subgrade and economic benefits are achieved.
马明磊, 王桂玲, 王永宏, 王文涛, 宋合财, 杜佐龙. 强夯置换碎石墩技术在高铁漂石路基中的应用[J]. 岩土工程学报, 2013, 35(zk2): 879-883.
MA Ming-lei, WANG Gui-ling, WANG Yong-hong, WANG Wen-tao, SONG He-cai, DU Zuo-long. Application dynamic compaction replacement technology in reinforcing stone subgrade of high-speed railway. Chinese J. Geot. Eng., 2013, 35(zk2): 879-883.
[1] QIN B H. Application of strong tamping and its replacement technology in reinforcing composite subgrade of railway passenger dedicated line[J]. Journal of Railway Engineering Society, 2007, 24(7): 33-37, 66. [2] XU D, WANG R, MENG Q, HU M. Field test analysis of dynamic consolidation and replacement sand pile on marine soft soil[J]. Rock and Soil Mechanics, 2009, 30(12): 3831-3836. [3] YAO T. Dynamic compaction stone-piers replacement application in highway soft soil treatment[J]. Quality of Civil Engineering and Construction, 2011, 29(3): 66-68. [4] DONG W, YAN S W, FENG S Z, et al. Study on dynamic compaction replacement for reinforcing freeway roadbed in wetlands[J]. Chinese Journal of Rock Mechanics and Engineering. 2009, 28(S1): 2966-2972. [5] XU J J, ZHENG W J, WU G X. Test study on heavy tamping and replacement for soft soil treatment in Wuhan-Guangzhou passenger special line[J]. Subgrade Engineering, 2007(4): 97-99. [6] XU H X, FAN Q H. Experimental study on dynamic compaction technology used in subgrade reinforced with crushed stone piers at certain section of Beijing-Shanghai high speed railway[J]. Railway Engineering. 2009(7): 125-127. [7] WU D X, LIU G, WANG G Q. Field test research on the bearing capacity of dynamic consolidation ground and compound foundation consolidated dynamically and soil-replaced by gravel piles[J]. Journal of Hefei University of Technology(Natural Science), 2008, 31(4): 622-625, 630. [8] WANG H X, YAN S W, FENG S Z. Study of mechanism of dynamic compaction replacement for reinforcing highway soft roadbed[J]. Rock and Soil Mechanics, 2009, 30(12): 3753-3758. [9] WANG H X, FENG S Z, YAN S W. Study on dynamic replacement for the consolidation of highway soft subgrade in high-cold wetlands[J]. Journal of Geotechnical Investigation and Surveying, 2009, 37(4): 15-20. [10] ZHANG F W, ZHOU H B. Testing study on the dynamically formed stone column compound foundation[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19(4): 522-525.