Treatment Technigue Of Soft Soil Base For Vehicle Section In Tianjin Light Rail And Its Uses

Vehicle section in Tianjin light rail is located in fifty-houses village of the Tanggu district, between the Jinbin high way and Jingshan Railway, near by the Heizhu river. The surface of the geology mostly is slime, mud, for the original earth of the project were fish pond and field of rice. So , the quality of doing with the soft soil directly affects the bearing ability of the bed of road and the other buildings in the project, and it is the key to guarantee the vehicle part running safely and efficiently when it is built.Base on the project, the technique program of the doing with soft base and construction is discussed and putted forward. Referring to the feature of the project and the buildings and fully considering the range, merit and demerit, limitations of the way used in the soft base right now, and considering the influence cased by the environment and economic efficiency and the process of the construction to the nearby environment, as well as many aspects such as the demand of base treatment and the condition of base are compared and analyzed, and two practical scheme of soft soil base:one is the deep mixing pile method, and the other is the ram compaction piles with composite bearing base. The design, construction and detect of these two ways are detailed in the thesis.By analyzing the problems existed in the process of measurement he deep mixing pile and the ram compaction piles with composite bearing base, measures are put forward. For the deep mixing pile, the pipeline lift must be strictly in the lift speed given by the design. Coment stuff spouted symmetricanlly, so as to avoid the cut-off and the pile shaft lopsided, which can affect the bearing capcaily of piles.Specially, the situation of piles must be checked repeatedly, so as to avoid the deflected pile or the no pile. For the ram compaction piles with composite bearing base, the speed of drawing pipe must be controlled, so as to avoid the gapping or the cut-off.The detection data of the the ram compaction piles with composite bearing base and the deep mixing pile are deeply analyzed, the study results show that the higher strenght, the quality of grain series is higher, and the restriction power of the mud around the peg is bigger, the vertical distortion is less, and the same with the rebounce. For the deep mixing pile, under the condition of the same displacement ratio, the length of the pile is longer, and the year of it is older, the bearing capacity of the peg is better, and the deformation is littler. When thelength of the pile and the year of it are the same, if the displacement ratio of the pile is higher, the bearing capacity is littler, and the deformation is higher. The opposition is still tenable.After the soft soil base of the vehicle section in tianjin light rail is treated by the deep mixing pile method and the ram compaction piles with composite bearing base , all of the piles can meet the demand of the design quality, and the environment is alse influenced.The geological condition after disposal can completely satisfy the request of the project.