Research On The Treatment To The Subgrade Disease Of Dazhun Railway

Da Zhun railway is our second heavy haul railway that running trains with ten thousand tons cargo.With the increase of traffic volume year by year, the damage to line bridge equipment becomes more and more seriously since the operation, the subgrade disease such as harmful freez, mud pumping, subgrade settlement are increasingly prominent. Owing to the poor drainage system of some sections, the disease are particularly serious, leading to the strength and stability of the subgrade has been difficult to guarantee the safety and stability of the operation. And it bears the heavy coal transport task, therefore, seeking a treatment that can deal with the disease without affecting the operation is very necessary.In this paper, the subgrade of K37+400-640section is taken as an example. The paper studies the mechanical behavior of subgrade according to the theory of soil mechanics and composite foundation, the method of numerical simulation etc., the treatment is proposed, the main results are obtained as followings:First, through the on-site GPR detection report, learning the subgrade disease present situation of railway subgrade disease, and analyzing the cause of the disease.Second, basing on the analysis of the common treatments to these ill roadbeds used in the existing railway line, the oblique lime-soil compaction piles treatment is introduced, But at present, the calculation theory about the oblique piles isn’t perfect, it can’t prove its feasibility in theory but by using numerical simulation.So, the upright piles treatment is designed through the composite foundation theory. It can provide a reference for the oblique piles treatment.Again, the reinforcement scheme of the oblique piles and upright piles are calculated by using numerical simulation, and Analysis on their reinforcement effects from the deformation and stress.The comparison results show that the oblique piles is more better.Finally, when used in the practical engineering, to ensure the reinforcement effect as well as economical, so this paper also optimize the angle of oblique piles, lime soil mixture ratio and the vertical distance of piles.