Abstract
A shaking table model test was carried out to develop an understanding of the performance improvement of saturated silty soil ground using stone column composite foundation as reinforcement. It is found that at less than 0.161 g loading acceleration, soil between piles has not yet been liquefied, the response acceleration scarcely enlarges, and the shear displacement almost does not appear in silty soil. At 0.252 g loading acceleration, as a result of liquefaction of soil between piles, the response acceleration increases rapidly and reaches its peak, and the shear displacement of silty soil increases significantly. At 0.325 g loading acceleration, the integral rigidity of foundation decreases greatly, which reduces its capability of vibration transmission and result in the response acceleration amplification coefficient is less than that at the former loading acceleration, but the shear displacement of silty soil further increases. The stone column composite foundation can greatly reduce both the shear displacement and the settlement of ground compared with untreated foundation. Under the condition of 7-degree seismic fortification, the design meets seismic resistance requirements.
Highlights
Beijing-Shanghai high speed railway is the first line of over 300 km/h in China, which is built on large acreage of silty soil ground that is mainly located in Haihe river basin, alluvial, and deposit zone of Yellow River, Yellow River old channel, Yangtze River deposit zone, and alluvial and deposit zone of other rivers
(1) At less than 0.161 g loading acceleration, there is no visible settlement on subgrade
While at 0.252 g loading acceleration, there is obvious uplift on both sides of ground surface, and the subgrade is damaged at 0.325 g loading acceleration
Summary
Beijing-Shanghai high speed railway is the first line of over 300 km/h in China, which is built on large acreage of silty soil ground that is mainly located in Haihe river basin, alluvial, and deposit zone of Yellow River, Yellow River old channel, Yangtze River deposit zone, and alluvial and deposit zone of other rivers. Stone column composite foundation (as shown in Figure 1), one of the most commonly used soil improvement technique, has been utilized worldwide to increase the bearing capacity of soft soils and reduce the settlement of superstructures constructed on them. Several researches have been carried out to study the behaviour of stone column-reinforced ground in recent years [2,3,4,5,6,7,8,9,10,11,12].
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