›› 2012, Vol. 33 ›› Issue (11): 3201-3207.

• Fundamental Theroy and Experimental Research •     Next Articles

Field test of railway soft clay subgrade reinforced by PCC piles

LIU Han-long1, 2，ZHOU Mi1, 2，CHEN Yu-min1, 2，XIE Song-bing3，SUN Hong-lin3   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China; 3. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China
  • Received:2011-08-12 Online:2012-11-12 Published:2012-11-14

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Abstract: The requirement of reinforcement effect of subgrade is stricter for railway than for highway. Cast-in-place concrete large-diameter pipe piles (PCC piles) are firstly applied to railway subgrade of connect-line of Nanjing south railway station. In order to explore the characteristics of railway subgrade reinforced by PCC piles, the field tests of quality inspections and performance tests are carried out, including low strain test, static load test, excavation test, and the monitoring of the stress of pile and soil, surface settlement of embankment, layered settlement of foundation, tensor force of geogrid, pore water pressure test. The quality inspections results indicate that PCC piles have good quality, and meet the requirement of bearing capacity design of railway subgrade. The performance tests confirm that the settlement is steady in 3 months after finishing construction of embankment; and the maximum lateral displacement is only 13 mm. As the settlement is steady quickly and small lateral displacement is strictly controlled; it indicates that railway subgrade reinforced by PCC piles can meet the requirement of control settlement with fast construction speed. It is expected to provide guidance for design and application of PCC piles reinforcing railway subgrade.

Key words: PCC pile, railway subgrade, soft clay subgrade, bearing capacity, settlement control

CLC Number: 

  • TU 447
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