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Long Rail Tunnel Guanjiao Geological Overview

. 5.3 karst geology under the surface tone paint, Triassic and Permian limestone joints, fissures more development. Groundwater is often produced along its corrosion cracks, gaps and caves solution than linear development. Quite different in size, usually 1mX1.5mX0.8m, who for the dozens of small cubic centimeters, and the larger visible 3.5mX2.5mX1.5m. _7 Hole drilling according to information ,3605.2-3606 .5 m ,3559.8-3660 .7 m (elevation) has developed cave, the cave filled with clay, and the core are corrosion phenomenon,[link widoczny dla zalogowanych], that there is limestone Karst. According to geophysical data (V Cool

analysis, DK293 +214 DK293 +514 section of a geophysical anomaly, suggesting that the karst area. The following methods can be taken during the construction process: Based on previous technology of tunnel construction in karst areas summarize, analyze cave of size,[link widoczny dla zalogowanych], location, whether filled or connected, the size of karst water, take a different treatment measures, such as backfilling, grouting, discharge , set bridges. 5.4 The instability surrounding the tunnel in the corner off a strong tectonic activities in the northeastern margin of Qinghai-Tibet Plateau, the local development of faults and folds higher than those of rock joints and fissures of a more developed, more broken rock. A particular DK283 +479 DK284 +889, DK301 +000 DK306 +000 paragraph one, faults, rock crushing, local water, collapse may occur in the construction and deformation of rock instability phenomenon. Construction may take the following measures: (1) to enhance advance support in the prevention of collapse of smaller general can play a key role. (2) When there is water gushing should be taken when grouting measures. (3) lots of poor geological conditions, should strengthen the monitoring and measurement, targeted to take timely measures to prevent landslides. (4) adjusting the construction method,[link widoczny dla zalogowanych], to take \6 A proposed DK283 +479 DK284 +889, DK301 +000 DK306 +000 a segment faults, complicated geological conditions, is more complicated geological conditions of the tunnel the two. Work scheduled to take a geology test tone painting, drilling, trenching and comprehensive combination of integrated geophysical exploration methods. Recommendations to further identify the fault occurrence, the nature of the material composition of fault zone, width, fragmentation level and water-rich conditions, etc., analysis and forecast the possible construction of a major geological problems occur, and propose engineering control measures. Karst limestone tunnel, high stress and high pressure sections, geological survey work should be further deepened, one by one to identify the characteristics of a variety of adverse geological parameters of the development of targeted engineering measures. Jiro hole Bayan Hall of fault or part of a high stress location, should further strengthen the tunnel primary support,[link widoczny dla zalogowanych], adequate reserve to increase the deformation, the second lining as far as possible nearly circular cross section in order to improve the tunnel by the force. Off angle of tunnels under the geological and hydrogeological characteristics, combined with other domestic long tunnel geological prediction of experience, using the geological record, mainly inside the cave, and geological and geophysical forecast (TSP202, TSP203, seismic reflection method, etc.) combination of horizontal drilling ahead of a comprehensive geological prediction method. Ⅱ line Guanjiao tunnel to tunnel construction as part of the paragraph level early lead, through post-secondary I line construction, geology forecast mainly in the line of the tunnel and auxiliary tunnel Ⅱ carried out, according to geological data Ⅱ line construction line I predict. Locally as limestone karst development, taking into account the complexity of karst development in the line I predict karst section of the tunnel should carry out the necessary geological prediction. To this end, proposed the establishment of the construction site of geological forecasting group, send an experienced technical personnel on-site geological prediction, improve the accuracy and efficiency of geological prediction. To strengthen the construction of the tunnel management, with experienced professional and technical staff and management in the construction design and construction process, to undertake the necessary technical advice. If the actual excavation revealed by geological conditions and the original design of rock changed greatly, it should promptly make changes to the design, timely adjustment of support measures to ensure the safety of tunnel construction.
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