| Soft ground treatment success is directly related to the normal operation later. For example, the highway network has evolved driven by its economic development in southern China, but it is a trouble to highway maintenance masters and builders about settling problems plaguing soft ground section in the post-operation. Some of the most commonly used methods such as replacement of soft ground treatment method, drainage consolidation method, CFG pile method used in the actual project is not uncommon, these methods or by long processing cycles, or subject to high construction cost, or the effect of treatment in general and other negative factors, has been limited in the use of engineering. Therefore, researchers face the questions: in what ways reinforcing the motorway soft more effectively; how to govern the high speed operating sections soft ground settlement. This paper presents a new kind of soft soil foundation reinforcement program on these issues- mold bag sleeve valve pipe pile in soft foundation treatment technology. The flow of the slurry process when dealing with soft soil can be well overcome conventional grouting methods appear unable to control, soil fracturing and serious phenomenon.Grouting technology use is more common in the construction and mining, but conventional fracture grouting technique in highway embankment construction within the scope of implementation is clearly more difficult, because after artificial soil that is very compacted soil slurry body flow passage provided. Conventional sleeve valve tube grouting technique in the soil although you can use, but larger grouting pressure on soil fracturing caused by the formation of secondary damage, the normal use of the road safety hazard. Mold bag sleeve valve pipe technology can well avoid the hard soil, for lower soil strength grouting reinforcement of soft soil. As compared with the conventional grouting method has better applicability engineering. Through field tests and numerical simulation of soft soil engineering examples of bag sleeve valve pipe pile to treat form bag sleeve valve pipe technology following research:(1) Through field tests of bag- grouting pile grouting pipe valve study mechanically compacted soil body is molded bag sleeves, main grouting, grouting pressure, the relationship among the three pore water pressure, through access the results of experiments done with the subject of previous experiments in this field to add further experiments comparing the results of the new technology at the same time improve the technical requirements.(2) Form bag Sleeve Valve Pipe Pile in Soft Foundation Treatment Project instances to monitor road subsidence, slope soil lateral displacement, pavement crack data were analyzed with a new understanding of the process appear in the actual application of the project related problems, and identify the key point to solve the problem. Analysis and evaluation of the actual effect of soft soil foundation treated with the new technology.(3) Carry out numerical simulation of mold bag pile grouting process. Finite element analysis software uses strength reduction after treatment expressway slope stability analysis, slope displacement, shear failure plane data on the treatment effect of the new technology was evaluated by comparing before and after grouting pile treatment; by pile force data obtained in the study on the role of the effect of bag- grouting pile in the soil play.In response to these findings Form Bag Sleeve Valve Pipe Technology exist certain shortcomings, this paper for the different treatment of soil grouting study found that when a higher degree of compaction of soil, in particular greater than 90% degree of compaction of the soil body is not suitable for processing grouting; grouting grouting pressure is not with the amount of the increase occurred after the changes to send equipment to meet the requirements; grouting pile foundation in interaction with the soil to form a composite foundation. |
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