2012, Volume 14, Issue 1
Strategic Study of CAE >> 2012, Volume 14, Issue 1
Model test study on surrounding soil stress distribution of DX pile
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
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Abstract
Through small scale model test of DX piles in lab, the test results can provide necessary basis for computing formula of settlement. A series of tests about DX piles with 22 mm diameter in sand are carried out in a small test chamber with the loading frame;the Q-s curves are derived, and then the bearing capacities are determined and compared with the straight piles in the same condition. At the meantime, miniature earth pressure cells are installed to test the stress in the surrounding soil of DX piles, so that the load transfer law in the soil can be researched. The test results show that the capacity and settlement characteristics of DX pile are much superior to the straight pile with the same parameters. For the single-bell DX pile, the location of the bell has barely effect on the capacity. However, when the bell locates on the lower part of pile shaft, the stress of soil around the pile tip increases a lot. For two-bell DX pile, the stresses around the two bells are similar, and the range of soil stress induced by bells in vertical is around two times of bell diameter. For the DX pile with three bells, the soil stress around the bells spread increasingly, while the amplitude is small.
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References
[ 1 ] 沈保汉，贺德新，刘振亮，等。DX多节挤扩桩的产生及特点[J].工业建筑，2004，34（3）：l-4. link1
[ 2 ] 陈立宏，唐松涛，贺德新.DX桩群桩现场实验研究[J].岩土力学，2011，32（4）：1003-1007.
[ 3 ] Tang Songtao，Chen Lihong.Field test of DX pile group.Intema-tional conferenee on civil engineering，architexture and building materials[C].Switzerland:Trans Tech Publications Lad，2011.
[ 4 ] 卢成原，王志军，孟凡丽.不同土质中模型支盘桩在重复荷载作用下的试验研究[J].岩石力学与工程学报，2007，26（增刊1）：3141-3147. link1
[ 5 ] 李天宝，卢成原，王科元。支盘桩工作性状的模型试验研究[J].浙江工业大学学报，2008，36（3）：290-294. link1
[ 6 ] 卢成原，贾颖栋，周玲.重复荷载下模型支盘桩工程性状的试验研究[J].岩土力学，2008，29（2）：431-436. link1
[ 7 ] 王科元，朱兴海，卢成原。 挤密效应对支盘桩承载性能影响的模型试验研究[J]，浙江工业大学学报，2009.37（1）：53- link1
[ 8 ] 陈志坚，刘艳军.超长灌注桩对桩周土挤密作用的模型试验研究[J].岩土力学，2008，29（12）：3277-3281. link1
[ 9 ] 叶真华，周健，唐世栋.粘土中不同桩端条件下桩承载性状的模型试验[J].同济大学学报：自然科学版，2009.37（6）：733-737. link1
[10] 郑刚，裴颖洁，刘双菊.竖向荷载作用下桩筏基础可视化模型试验研究[J].岩土力学，2008，29（ll）：2912-2918. link1
[11] Gregory S Wachman，Joseph F Labuz.Soil-structure interaction of an carth pressure cell[J].Joumal of geotechnical and geocn-vironmental engineering，2011，137（9）：843-845.
[12] 韦四江.王大顺， 郜进海，等，微型土压力盒的标定及修正[J].地下空间与工程学报，2009，5（5）：1003-1006. link1
[13] Labuz JF，Theroux B.Lahoratory calibration of earth pressure cells[J].ASTM Geotech Tex J，2005，28（2）：188-196. link1
[14] Selig ET.Soil stress gage ealibration[J].ASTM Geotech Test J.1980.3（4）：153-158.
[15] Weller WAIr，Kulhawy F H.Factors affecting stress ccll meas-urements in coil[J].I Geotech Eng Div，1982，108（GTl2）：1529-1548.
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