Abstract:Research purposes:The filling test with graded broken stone was done for the Tianjin - Qinhuangdao Passenger Dedicated Line to solve the problems of influencing the quality of the subgrade by the material,gradation,mud content,cement content and compactness of graded broken stone. The analysis and research were made and done on the key reasons and points for influencing the quality of the subgrade.The specific measures were presented for avoiding the appearance of the quality problem,potential safety hazard and subgrade diseases. The study presented in this paper has a guiding significance for design of the railway graded broken stone and control of construction quality.
Research conclusions: The gradation of graded broken stone must satisfy the technical requirements. The stone should be washed and the fine particles below 0.075 mm should be screened out during construction.The quality control index should include the unconfined compressive strength in different age and different dosage,the freeze thawing,the permeability,the resilience modulus,the shrinkage and the fatigue,and all these indexs should increase before and after the construction.The plain concrete can be made of the graded broken stone with cement,and this construction method is mature. The plain concrete strength should be designed as C25 to keep enough stiffness and prevent freezing damage.But the concrete grade should not be too high and its volume should not be too big in order to avoid the high cost of the high grade and mass concrete with being easy to crack.
唐文军. 铁路路基工程级配碎石质量控制研究[J]. 铁道工程学报, 2013, 30(4): 36-40.
TANG Wen - jun. Study on Quality Control of Graded Broken Stone for Railway Subgrade Engineering. 铁道工程学报, 2013, 30(4): 36-40.
Dong Guojun. Research on Mechanics Performance Test of Graded Crushed Stone[J].Journal of Highway and Transportation Research and Development,2011 (10) :102-103.
Yang Bing. The Construction and Quality Control of Cement Stabilized Graded Crushed Stone in Subbase Grass - roots [J].Technology of Highway and Transport,2003(2) : 10-12.
[7] 陈东华.水泥用量对混凝土抗冻性能影响的试验研究[D].沈阳: 东北大学,2009.
Chen Donghua. Testing Research on Cement Content on the Frost Resistance of Concrete Influence [D]. Shenyang: Northeastern University,2009.
[8] 周易平. 高速铁路路基填料改良技术研究[D].北京: 铁道科学研究院,2000.
Zhou Yiping. Research on High Speed Railway Subgrade Filler Improved Technology [D].Beijing: China Academy of Railway Sciences,2000.
Mo Shixiu. Research on Shear Performance Test of Graded Crushed Stone[J].Journal of Highway and Transportation Research and Development,2005 (12) : 39-41.
Wang Xiaoming. Research on Railway Line for Passenger Traffic Subgrade Filler Improved Technology [J]. Journal of Railway Engineering Society,2010(3) : 24-27.