Burying-before-guiding type step-by-step burying method for monitoring instruments in synchronous construction with loess high fill

Abstract

The invention discloses a burying-before-guiding type step-by-step burying method for monitoring instruments in synchronous construction with loess high fill. The loess high fill under construction comprises multiple filling segments from bottom to top. The multiple monitoring instruments to be buried are spot measurement type monitoring instruments. The burying-before-guiding type step-by-step burying method comprises the following steps: step one, the filling segment at the bottom is filled, and the spot measurement type monitoring instrument at the bottom is buried; step two, cables are centralized and protected temporarily; step three, the previous filling segment is filled and the previous spot measurement type monitoring instrument is buried; step four, the cables are guided, specifically, the data transmission cables which are protected temporarily are guided onto a current filling surface; step five, whether the burying process is finished is judged, namely, when the filling elevation reaches the designed elevation of the loess high fill, the burying process is finished; otherwise, the data transmission cables are all centralized at one position and protected temporarily, and then the step three is returned to. The burying-before-guiding type step-by-step burying method is simple in step, convenient to implement, and good in burying effect; the burying process does not interfere with the construction process of the loess high fill, and the construction process of the loess high fill and relevant parameters after the construction is completed can be monitored.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering monitoring, and in particular relates to a step-by-step burial method of a monitoring instrument which is constructed simultaneously with loess high fill. Background technique [0002] In recent years, urban construction has been carried out in the loess hilly and gully area in western my country, and infrastructure such as airports, railways, and highways have been built. Due to the constraints of terrain and space, a large number of high loess filling projects have been formed. Due to the characteristics of complex geological conditions, large amount of earthwork, large filling thickness, fast filling speed, and tight construction period, the high loess filling project often has special soils such as collapsible loess and silted soft soil in embankments. The deformation and stability of loess high fill engineering has always been the focus of attention in engineering constructio...

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Problems solved by technology

Post-construction embedding refers to drilling to the design depth to embed monitoring instruments after the high-fill body reaches the design elevation. This method will lose the monitoring data during the construction period, and only the high-fill body can be obtained after the filling construction is completed. monitoring results, which is not conducive to the settlement analysis and deformation prediction of high loess fill; the follow-up embedding with the filling body construction refers to the simultaneous embedding of monitoring instruments along with the filling construction, and the monitoring instruments are dug or stacked simultaneously. When buried in the soil, it is often necessary to lead the observation cables or monitoring components of the buried monitoring instruments above the current construction ground, and set up protective devices for protection. In addition to coordination and cooperation with the construction unit, sometimes it is necessary to arrange special personnel for 24 hours The guard on duty, and the protection method of leading the observation cable of the monitoring instrument to the safe area outside the construction work surface can meet the requirements for highway, railway and other line projects or small-area high-fill projects, but it is difficult for large-area high-fill projects , high cost, difficult to adopt

In addition, on-site construction machinery needs to take measures such as detour and avoidance near the monitoring point. On the one hand, this method will seriously interfere with the construction, and on the other hand, it will cause the soil compaction degree near the monitoring instrument embedding point to deteriorate, and the construction of filling soil The quality cannot be guaranteed, and the measured data cannot accurately reflect the actual situation of the high-fill cube

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