| Distributed widely in our country, soft soil has the characteristics of low shearing strength, large deformation. If soft soil was treated in mistake way, foundation would come into being local shear failure or general-shear failure. In Le-Wen highway engineering, the partial road sections cross soft soil. For ensuring the safety of superstructure, it is important to treat soft soil roadbed. The technique of the Dry Jet Mixing Method (DJM) is one of treating technologies of soft soil roadbed presently. The DJM has the ideal reinforcement effect to the bad character of soft soil in a time-limited project. The background of this paper is the using of the DJM in Le-Wen highway soft base, the soft soil slope of embankment stability and soft soil reinforcement measure are analyzed.The reinforcement effect of DJM is appraised through numerical simulation and monitor on construction process of soft soil embankment. Following conclusions are obtained.(1) Using the theory of filling emergency altitude of soft soil embankment, filling emergency altitude of natural soft soil is calculated; the stability of natural soft soil embankment slope is analyzed by using the software Geo-slope. The results of two approaches indicate that soft soil foundation needs for the reinforcement.(2) The design parameters of the DJM are identified by engineering analogism and the test pile, and the settlement quantity and safety coefficient of reinforcement foundation are calculated. The results indicate that the project request is satisfied;(3) The settlement quantity and pore water pressure of the DJM complex foundation are simulated by the finite element method, and the impact factors of composite foundation settlement are analyzed;(4) In the construction process, the embankment stability and settlement of soft soil have been monitored dynamically, and the settlement and lateral displacement of soft soil foundation and etc. have been analyzed, and the control standard of fill speed has been... |
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