High-Speed Railway Roadbed Improved Soil Performance Experiment And Construction Technology Research

This article has obtained one batch of physical, chemistry, the mechanical properties aspects correlation data through the improved soil project nature experiment, passes through five kind of Improved soil index of correlation comparison and carries on the contrast with the high-speed railway request, obtained the high-speed railway improved soil to select, the job practice aspect some conclusion.Limes and the soil mutual function may divide into four kinds: One is the ionic exchange function; Two, crystallization induration; Three, is the pozzolanic action; Four is the carbonation function. The cement soil improvement principle is the cement distributes in the soil constitutes the firm core, forms the hydrated cement in all crevices the skeleton, in order to the restraint soil particles.Through in five kind of improved soil room, the raw material and the field test, indicated five kind of improved soil may take the high-speed railway roadbed bed first floor the padding, its experimental value had achieved the stipulation request, according to the test result union technology economy comparison, may obtain a plasticity index higher cohesive soil to be possible to use the lime improvement, the powder (granulated substance) the soil may use the cement improvement the conclusion. With the nucleon density meter, fills the granulated substance law, the link knife skill three methods determination compacting factor and carries on the contrast, discovered the nucleon density meter deviation normal value is bigger, thus infers it not suitable achievement high-speed railway roadbed compaction quality examination method. Carried on the experiment after the compacting factor and the roller compaction number of times relations to obtain its relational chart and the best roller compaction number of times.After measured shifts the cement improved soil from to mix gathers finished within the suitable control 4 hours to the roller compaction, the lime improved soil should not be bigger than for 12 hours, if stagnates presses the time excessively to be long, again when roller compaction inevitably destroys the improved soil the initial period intensity, causes the final compaction intensity weaken also not the easy compaction, the roller compaction to be supposed continuously to carry on, parks period of time to make up the pressure again, the compacting factor increases really micro. The improved soil intensity in the certain time scope is, therefore suggested in the roller compaction which increases along with the time completes in for 24 hours to start to carry on the K30 experiment, otherwise the test result possibly distorts.The improved soil job practice mainly to have the factory to mix, road mixing and the field mixes three kinds, has formed the maturer labor law, can satisfy the passenger transportation special line through the strict process control the quality requirement. After three methods contrasts, we found that the field mixed the law already both to overcome"Road Mixing" Construction irregularity, the human factor big, to thickness request strict, mixed the material to mix the quantitycontrol difficulty in a big way, is easy to cause flaw and so onenvironmental pollution, and solved " Mixing Plant Act" the workefficiency to be low, the cost high question, had the economy, issuitable, may the operational strong characteristic, the present stagemight promote the use.This time carries on firming agent improvement experiment in railway project also quite few, its test result satisfies the passenger transportation special line the request also the cost relative is lower, will open up modifiers the scope for later to make some explorations. In brief, through the experiment thought the padding improvement is the solution high quality padding lacks and reduces the project construction cost effective way...