CHARACTERISTICS OF LIQUEFACTION STRENGTH OF SAND UNDER OVERCONSOLIDATION AND LONG-TERM CONSOLIDATION CONDITIONS
If sandy soil deposits are subjected to overconsolidation or long-term consolidation, their liquefaction strength increases. However, only a few studies have investigated the effects of overconsolidation or long-term consolidation by means of laboratory element tests in order to simulate the in-situ ground condition more closely. In the present study, the liquefaction strength characteristics of overconsolidated sand samples were investigated under a K0-stress condition by using a hollow cylindrical torsional shear apparatus based on the of the supposition that earthquake excitations affect the ground horizontally. Further, a surcharge method was used to simulate the stress histories of overconsolidation. The effect of overconsolidation on the liquefaction strength was studied on sand samples that were consolidated for a considerable period of time. Clean Toyoura sand and sandy soil collected from the sea bed containing fines were used as samples. The following behaviors were observed in the tests: 1) The liquefaction strength of both types of sand increased due to overconsolidation when the samples were subjected to long-term consolidation before the stress history of overconsolidation was applied to them. 2) The increase in the liquefaction strength of the two types of sand subjected to overconsolidation and long-term consolidation could be formularized by the overconsolidation ratio and the time taken for long-term consolidation.
liquefaction strength overconsolidation long-term consolidation sandy soil
H. Nagase A. Hirooka S. Sawada S. Nakamura G. Inoue
Dept. Of Civil Engineering, Kyushu Institute of Technology, Kitakyushu. Japan Obayashi Road Co., Ltd., Japan Kyushu Institute of Technology, Kitakyushu. Japan
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）