Characteristics of Arc Plate Shell Support Function of Arc Plate Shell Support

Description :

　　Soft rock roadway support has always been one of the key technical issues affecting the further development of China's coal industry production and construction. The ground pressure intensity in deep mines is high, and it is particularly difficult to control the strata under the influence of mining and impact ground pressure conditions. Therefore, the support system is becoming increasingly strengthened, such as reducing the spacing between 29U steel supports, strengthening connecting rods, and even using U36 steel; Anchor net spraying support should be reinforced with steel arches or combined with anchor cables, surrounding rock grouting, etc; Although this can achieve a certain level of support effect, the cost of support is very high. Therefore, Yimei sells a new type of mesh shell support, whose main support characteristics are summarized as "excavation and support at the same time, support and yield at the same time, flexible first and then rigid, sufficient rigidity, simple process, and low price".

　　Characteristics of Arc Plate Shell Support for Lane Protection

　　1. Dig and support at the same time, provide timely support.

　　The back filling of the arc-shaped grid shell support can be done with gangue, ash bags, precast concrete slabs, etc., so that the grid can quickly and closely adhere to the contour of the tunnel, support while excavating, and support in a timely manner. On the one hand, this can enable the support resistance of the support to be exerted in a timely manner, and the surrounding rock to be reinforced in a timely manner and work under three-dimensional stress state; On the other hand, it plays a role in relieving and equalizing pressure, making the support around the roadway more evenly stressed and in good working condition.

　　2. The arc-shaped grid shell support has sufficient "stiffness".

　　3. Gentle and moderate "and" gentle first, then firm ".

　　The stress of the arc-shaped grid shell support has complex components, such as expansion and creep of the rock mass, decrease in long-term strength, and decrease in the bond coefficient of the fractured rock mass. All of these are manifested as macroscopic displacement of the rock mass. Any rigid support that wants to completely prevent displacement will put itself in a disadvantageous position. Therefore, the stability of the roadway ultimately needs to be achieved through the joint action of the support and surrounding rock. The mesh shell support not only bears a large amount of geostress, but also reacts with the surrounding rock, causing it to converge under the control of the support. Through the support's edge support, the broken rock mass continuously converges and compacts, forming a stable bearing ring that shares the role of geostress with the support.

　　The compressibility of the arc-shaped grid shell support comes from two aspects:

　　(1) The steel mesh frame in contact with the surrounding rock has a certain degree of compressibility;

　　(2) Wooden pads at the connection between the grid shell support pieces.

　　Application analysis of arc-shaped grid shell support engineering

　　(1) Traditional metal brackets or steel arch frames are used as reinforcement ribs for concrete spraying layers, which generate significant bending moments inside the spraying layer and require special reinforcement; The use of semi-rigid reinforced mesh shell not only improves the load-bearing capacity of the sprayed layer, but also eliminates the bending internal forces in the sprayed layer.

　　(2) The arc plate type mesh shell support has been transformed from passive support to active support, which has both high support resistance and good compressibility. The support structure has the characteristic of "flexible first and then rigid", which is in line with the basic idea of soft rock support.

　　(3) Through on-site measurements of steel bar strain, tunnel surrounding rock displacement, and convergence, it is known that the mesh shell anchor spray support structure has good overall interaction with the surrounding rock, which can prolong the self stabilization time of the surrounding rock and facilitate the full play of its own role.

　　(4) The use of grid shell concrete supports indicates that this new technology is safe and feasible in construction, achieving successful support in one attempt and fundamentally changing the situation where certain tunnels require continuous maintenance or repair.

　　(5) The successful application of arc-shaped mesh shell supports provides successful experience for soft rock support. This new type of support structure has a reasonable design, strong integrity, and the ability to resist large deformations in tunnels. Compared with heavy-duty U-steel supports, it can save 40% of steel and reduce the direct cost of supports by about 30%. Therefore, it can be widely promoted and applied in high stress soft rock tunnel support. zmjt055

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