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Research on Application of Cement Mortar Pile in Reinforcing Soft Foundation of High-speed Railway

TAN Yuan-fa(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430063,China)  
Research purposes: The cement mortar pile developed from the deep mixing pile in recent years is a new way of reinforcing soft foundation.The high-speed railway has a strict requirements for the post-construction settlement of subgrade.Through the design,construction and field test for reinforcing the soft foundation of one high-speed railway,the research was done on the reinforcement mechanism,design parameters,construction technology and reinforcement effect of the cement mortar pile to reinforce the soft foundation.Research conclusions:It is feasible to reinforce the soft foundation of high-speed railway with cement mortar pile because application of cement mortar pile can overcome the problem of the insufficient strength of the pile when using cement injection pile and plasma spray pile in cohesive soil with high plasticity index.However,the construction technology,reasonable water-cement ratio and gray-sand ratio,and the construction parameters of the cement mortar pile must be determined by test piling,so it is proposed to strengthen the on-site construction management when using cement mortar pile.In addition,the quality inspection of pile can be done by the core drilling along with load test.In order to ensure the effects of cement strength and reinforcement,it is not allowed the large-sized construction machinery to roll the upper embankment on cement mortar mixing pile within aging of 28 days.
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