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Study and Evaluate of Stability and Water Gushing of Surrounding Rockmass in Karst Area Tunnel in Leguang Freeway

Author: ShenDongDong
Tutor: LiYunAn
School: China University of Geosciences
Course: Geological Engineering
Keywords: Karst Tunnel Stability evaluation Numerical Simulation Inflow analysis Fault fracture zone
CLC: U453.61
Type: Master's thesis
Year: 2011
Downloads: 128
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With the deepening of the large-scale development of the western region and the gradual improvement of the national highway network, a growing number of tunnel construction in karst areas. The biggest problem facing the tunnels in karst area tunnel surrounding rock stability and the sudden gushing geological disasters and to study karst area tunnel stability and its engineering applications, has important theory and its practical significance. Papers relying on the horizontal research projects \ways to make comprehensive use of the method of tunnel surrounding rock stability and sudden gushing details are as follows: (1) regional geological setting and Tunnel Engineering (Hydrology) geological conditions. Summed up the the regional karst development law, and identify adverse geological conditions of tunnel surrounding rock stability and sudden gushing. (2) Factors Influencing the Stability and surrounding rock classification study. Qualitative evaluation of the impact of various factors on tunnel stability, and through the surrounding rock classification study the level and stability of the region surrounding rock, to provide a basis for further research. (3) tunnel stability evaluation numerical simulation. Using ANSYS the FLAC3D software analysis support tunnel ZK91 600 ~ ZK91 650 segments surrounding rock displacement distribution, the distribution of stress distribution and plastic zone to evaluate the stability of surrounding rock after the failure mechanism and support. (4) water tunnel research. Karst tracer tests to identify groundwater flow and the impact of the tunnel; empirical formula to estimate each cave (sinkholes) and total inflow of water inflow; hydrogeological regional studies come to affect the tunnel The partition of the daily average inflow of the sum and the maximum sum of water inflow; focuses on a red roof area inflow maximum flow rate and water gushing total. (5) karst tunnel countermeasures. For the content of the above studies, the following conclusions: (1) development of the tunnel area 42 cave (nine in the left side of the line bit 3 in the middle of the line bit 30 is located on the right side of the line-bit), 20 tectonic zone (contains nine fault fracture zone, three unconformity contact line and eight broken gap), groundwater migration, storage good channel and spaces, the surrounding rock instability caused by tunneling, sudden The gushing water and land subsidence bring an extremely adverse impact. (2) evaluation of lithology and thickness, the attitude of rocks, geological formations, karst morphology and spatial distribution of the filling as well as hydro-geological conditions of the tunnel, drawn between influencing factors are associated, under certain conditions can promote each other, especially in the line bit the left side of the cave, the sinkhole near fault fracture zone as well as the flow of the tunnel groundwater inside the greatest impact on the stability of the tunnel. Tunnel surrounding rock class Ⅲ and Ⅳ surrounding total (both 77%), and the surrounding rock as a whole than broken, is relatively stable - less stable state, but in the cave known through the surrounding rock classification evaluation under the combined effects of the fault fracture zone and groundwater, not timely support prone to instability and failure, and sudden gushing disaster. (3) Select ZK91 600 ~ ZK91 650 study, quantitative evaluation of knowledge through numerical simulation, the tunnel excavation in the support case, y = 24m cross-section, for example, the horizontal direction (X), the maximum displacement of 22.31mm vertical the maximum displacement of the straight direction (Y) of 29.25mm. Surrounding rock mass after excavation of the tunnel for the tensile failure of surrounding rock displacement convergence to the tunnel inside and caverns inside; most dangerous position in the area of ??tunnels and caverns side most likely to lead to instability and failure; stress concentration prone to in karst tunnel between the surrounding rock area, especially in the arch waist. (4) drawn by ion tracer test groundwater law of motion: the ZK90 120m to ZK91 930m, groundwater by ZK91 930m Shun along the tunnel axis to the entrance the ZK90 120m direction liquidity; ZK91 930m to ZK92 152m, groundwater is nearly perpendicular to the tunnel axis flow to the SW direction ; ZK93 147.6m ~ ZK94 40m groundwater Mountain the ZK93 147.6m smooth along the tunnel axis flow to export the ZK94 40m direction. The left side of the tunnel cave and its groundwater sudden gushing of the tunnel, but the tunnel right side of the cave and its groundwater of the tunnel will not produce sudden gushing. : Sinkholes total inflow through the tunnel inflow estimates known 7446.9m3 / d; study area is divided into a total of 12 hydrogeological area watershed area tunnel daily inflow to 15135m3 / d, the maximum daily inflow for 1505695m3 / d. Red old top zone (ZK91 700m) of a groundwater body, the normal water level and non-recharging, groundwater flow reached 191.2m3 / s; extreme cases, the maximum flow of groundwater reached 390.6m3 / s, easy to produce sudden gushing disaster. (5) Summary of karst water, karst caves and cave fillings Treatment Measures to provide theoretical basis for the for further disposal design of tunnel construction.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel buildings and equipment > Waterproofing and drainage,waterproofing and drainage equipment > Groundwater and gushing water control measures and equipment
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