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Anchor spray burst of light based on the comprehensive management of soft rock


/ C ~ n'I uniaxial compressive strength, dry samples and wet samples, natural samples were 58,23.8,vibram five fingers outlet,32.65 ~ Pa; uniaxial tensile strength of 0.51M: Pa; modulus 2. rSkg / cnlI Poisson's ratio of 0.3} 17 plus cohesion, internal friction angle of 37. I porosity, moisture content of 1.88 3.89I 3. Expansion properties of rock mass quality index and RQD = 1.4rr/42.1 = 0.035 rocky core inflation rate = 4.9r4/18.84 = 0.264 and swelling force in table 1. Huan 1 time o. 331. oe. o8. o23 (h) 0.2B0.290.340.3T mat inflation rate (axis) 1. oB4l:. 031.631.731.79I_81 coal layers of silty mudstone disintegration index in Table 2. Huan 2 garlic top layer two top-five health I four top-seven coal coal top one cycle 98.398. TT08.9698.98 = slot ring 0.139T. 20T. 3397.884. Luk-varying characteristics appear Horsehead auxiliary shaft tunnel, the distance 54 ~ 60m pumping station excavation disturbance thixotropic, Shi Xuan and RC material changes, the deformation and supporting, the stress tends to stabilize,knock off oakleys, re-paid balance. In this process, we allow the surrounding rock to release some stress,Beats By Dre Headphones, they should be properly controlled deformation. Shotcrete early, often cracking of abscission layer peeling spray, which often occur between the bolt and bolt, in addition to tectonic stress effects, the anchor asked one of the reasons is the larger pitch. Therefore, depending on geological conditions and the stability of the rock bolt density adjusted so that the layout is reasonable, while the foot bolts to strengthen the quality of the installation. As the deformation of surrounding rock, so narrow cross-section, so the excavation will be increased on each side about 100mm by Lane as a compensation space is necessary. Use anchors and anchor net spray spray steel bracing, the more should be done. Shotcrete as permanent bracing soft rock, there are generally Xuan convergence deformation, extension period of 12 months. When after the start of the main shaft Horsehead (with auxiliary shaft away [30m), on the auxiliary shaft Horsehead thixotropic second disturbance, serious convergence Xuan body deformation, the deformation of 12.6mm / ~, has carried 12 months. Second, the regional geological structure and tectonic stress 1. The mine is located in the regional organization sent east to west from the south side of Ma Shan Shan uplift, Qiyang-arc north wing, placed into a series of pull out wrinkled group (Figure 1). Regional tectonic features of the fold, anticline, the axial both NE - SW direction, and was obviously the Figure 1 Tectonic map of the mine structure morphology of asymmetric syncline diamond shape, the bottom middle of mostly double syncline, which was saddle-shaped rolling axis (Figure 2), the direction of N25-46. E, north-east side of N75. E. 2. According to the ancient complex stress field survey confirmed that the mine has gone through three ancient tectonic movements. Figure 2 Regional geological map of cattle Secretary mine first phase of Soochow phase movement, the direction of stress field near the main north-south, the major form of this tectonic movement Yongsan - Baimashan uplift, has little effect on the mining area, only formed a number of north-south small normal faults, and some conjugate x joints. The second period of Yanshan movement, the main stress direction N45 ~ 60. W, the N15. W and N75. E have a set of shear stress in the N20. E has a tensile stress, the formation of this tectonic movement and some of the secondary cattle Division syncline folds and faults. The third phase of the transformation period, the first two tectonic transformation, and generation and tectonic stress field in the third match of the folds and faults. Current tectonic stress field is generated by a smooth torsion role in the N60. E direction of a compressive stress in the N30. W direction of a tensile stress. As the current structure along the torque effect, so that cattle Division syncline north east deflection,herve leger sale, but also had other folds and faults. 3. Ru-I stress test results measured stress-relief method first mine wells three principal stress stress field in Table 3. According to calculations, the stress of the mining area in the Mainland has the following characteristics: to be restored 2 to 3 times,######## oakley sunglasses, immediately after the injection of concrete excavation shoring, it is difficult to prevent deformation of the tunnel convergence. For the unstable soft rock, to the use of shotcrete shoring for the first time, and then wait to assemble a stable pressure or the erection of steel arch Xuan oak frame supporting the second, to improve the supporting strength and security. Support should be the second time to master the basic stability or deformation in the rock after peak, before the intended purpose, such as conditions allow, should also avoid deformation of the peak. Severe floor heave end arch masonry section the method used is reliable. In addition, we have to double-track single-track single-Lane to Lane, and the use of advanced methods of construction of a roadway, roadway ahead of first relief, with another layer of rock in the roadway is to slow pressure, the pressure is also small. (Series Dong Tae responsibility lie straight)
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