The Technology And Monitoring Of Disturbed Soil Freezing Method In Metro Contact Passage

Along with the accelerated process of urbanization in China, many cities in our country population travel and traffic contradiction exists is not small, the construction of urban rail transit, especially subway construction is imperative. Because the law and other artificial ground freezing construction method has its own advantages, gradually become the main construction method of underground liaison passage or adjacent channel. But the artificial ground freezing method process is more complex, more influence factors to the freezing of success and failure, especially the construction of freezing method construction in busy cities have a certain risk.Shenyang Metro Line2"Engineering College" to "Liaoning University" station-station interval2contact passageway in the WSS grouting method for reinforcement of soil failure, the construction process appears a few times show that sand gushing phenomenon, due to the location of the project formation complex hydro geological conditions, the grouting reinforcement can not form a water seal system fully enclosed, considering the intended to switch to artificial freezing method construction of reinforcing soil, soil was artificially injected cement slurry and reclamation of soil, so strong disturbed soil layer will be on the artificial freezing method construction have more or less influence. Although the construction of artificial freezing method in domestic and foreign subway contact channel and side channel had a successful practice of many. But certain risks still exist in the construction of strong disturbed soil layer in. Taking Shenyang Metro Line2"Engineering College" station "Liaoning University" station interval2contact passageway project as the project background, through on-site practice, collecting and drawing temperature measuring hole temperature, pressure relief hole pressure, the frost heaving pressure changing with time trend chart, and conventional soil temperature measuring hole temperature, pressure, pressure relief hole the frost heaving pressure changing with time trend chart comparison, analysis of the disturbed soil layer effect on the artificial freezing method, the construction process of risk source. And put forward the measures of risk control. The analysis of the data to a:soil disturbance on the difficulty of the construction of freezing pipe to increase a lot, the temperature field in the development of disturbance in soil layer is not uniform, should be scientific and prudent to assess whether the excavation conditions, disturbed soil, frost heaving and thawing settlement of soil is smaller than normal.Disturbance of soil freezing method construction risk factors more, should pay particular attention in construction. The conclusion of this engineering data, have certain reference significance for other project.