Inorganic composite grouting material for working face fault passing advance pre-reinforcement

Abstract

The invention discloses an inorganic composite grouting material for working face fault passing advance pre-reinforcement. The inorganic composite grouting material is obtained by well mixing base material, coal ash and shortcut carbon fiber or base material, Portland cement, coal ahs and shortcut carbon fiber at normal temperature. When in use, inorganic composite grouting liquid can be obtainedby well mixing and stirring water and the inorganic composite grouting material according to a mass ratio of 0.3-0.4:1; initial setting time of the inorganic composite grouting liquid is longer than 5h, 28d uniaxial compressive strength is not lower than 45MPa, bending strength is not lower than 7 MPa, and residual compressive strength is increased by higher than 30% when compared with that of conventional PO42.5 cement grouting materials. The inorganic composite grouting material can meet long-drill-hole pre-grouting reinforcing process requirements in the aspects of fluidity, curing time, binding strength, environment friendliness and safety, can effectively improve strength of coal rock around fault and ensure a working face to safely and quickly pass the fault.

Description

technical field

[0001] The invention belongs to the technical field of grouting support in coal mines, and in particular relates to an inorganic composite grouting material for pre-reinforcement of broken coal and rock mass in an underground fault zone. Background technique

[0002] A fault is a structure in which the crust is fractured by force, and the rock blocks on both sides of the fracture surface undergo significant relative displacement. Faults vary in size, and the larger ones can extend up to thousands of kilometers along the strike, and can cut through the crust downwards. Usually, many faults are called fault zones.

[0003] In the process of coal mining and production, large faults are generally avoided in the design stage to minimize the impact of faults on production. However, for relatively small faults (generally within 5m), in order to avoid the great waste of coal resources and damage to production continuity caused by "evasion measures", the working face...

Examples

Embodiment 1

[0046] The specific operation steps for preparing inorganic composite grouting material are as follows:

[0047] 1) At room temperature, weigh 1600g of dry base material, 400g of fly ash and 2g of chopped carbon fiber respectively, base material: fly ash: chopped carbon fiber=4:1:0.005; base material is made of PO42.5 silicate Prepared by mixing 1200 g of cement, 128 g of silica fume powder, 128 g of sulphoaluminate cement, 120 g of slag powder, 11.2 g of water reducer and 12.8 g of plastic expansion agent, PO42.5 Portland cement: silica fume powder: Sulphoaluminate cement: slag powder: water reducing agent: plastic expansion agent==75:8:8:7.5:0.7:0.8.

[0048] 2) Pour the weighed raw materials into the mixing container in turn, and stir evenly.

[0049] 3) Weigh 630g of water according to the water-cement ratio of 0.315:1, slowly add it into the above stirring container, and stir while adding water; after the addition, continue to fully stir for 15 minutes to obtain an inorgan...

Embodiment 2

[0055] The specific operation steps for preparing inorganic composite grouting material are as follows:

[0056] 1) At room temperature, weigh 1500g of dry base material, 500g of fly ash and 2g of chopped carbon fiber, base material: fly ash: chopped carbon fiber=3:1:0.004; base material is made of PO42.5 silicate Prepared by mixing 1125 g of cement, 120 g of silica fume powder, 120 g of sulphoaluminate cement, 112.5 g of slag powder, 10.5 g of water reducing agent and 12.0 g of plastic expansion agent, PO42.5 Portland cement: silica fume powder: Sulphoaluminate cement: slag powder: water reducing agent: plastic expansion agent==75:8:8:7.5:0.7:0.8.

[0057] 2) Pour the weighed raw materials into the mixing container in turn, and stir evenly.

[0058] 3) Weigh 620g of water according to the water-cement ratio of 0.31:1, slowly add it into the above stirring container, and stir while adding water; after the addition, continue to fully stir for 15 minutes to obtain an inorganic ...

Embodiment 3

[0064] The specific operation steps for preparing inorganic composite grouting material are as follows:

[0065] 1) At room temperature, weigh 1400g of dry base material, 300g of PO52.5 cement, 300g of fly ash and 2g of chopped carbon fiber, base material: PO52.5 cement: fly ash: chopped carbon fiber=7:1.5: 1.5:0.01; the base material is prepared by uniformly mixing 1050g of PO42.5 Portland cement, 112g of silica fume powder, 112g of sulphoaluminate cement, 105g of slag powder, 9.8g of water reducing agent and 11.2g of plastic expansion agent, PO42.5 Portland cement: silica fume powder: sulphoaluminate cement: slag powder: water reducer: plastic expansion agent==75:8:8:7.5:0.7:0.8.

[0066] 2) Pour the weighed raw materials into the mixing container in turn, and stir evenly.

[0067] 3) Weigh 620g of water according to the water-cement ratio of 0.31:1, slowly add it into the above stirring container, and stir while adding water; after the addition, continue to fully stir for ...

technical field

[0001] The invention belongs to the technical field of grouting support in coal mines, and in particular relates to an inorganic composite grouting material for pre-reinforcement of broken coal and rock mass in an underground fault zone. Background technique

[0002] A fault is a structure in which the crust is fractured by force, and the rock blocks on both sides of the fracture surface undergo significant relative displacement. Faults vary in size, and the larger ones can extend up to thousands of kilometers along the strike, and can cut through the crust downwards. Usually, many faults are called fault zones.

[0003] In the process of coal mining and production, large faults are generally avoided in the design stage to minimize the impact of faults on production. However, for relatively small faults (generally within 5m), in order to avoid the great waste of coal resources and damage to production continuity caused by "evasion measures", the working face...

Examples

Embodiment 1

[0046] The specific operation steps for preparing inorganic composite grouting material are as follows:

[0047] 1) At room temperature, weigh 1600g of dry base material, 400g of fly ash and 2g of chopped carbon fiber respectively, base material: fly ash: chopped carbon fiber=4:1:0.005; base material is made of PO42.5 silicate Prepared by mixing 1200 g of cement, 128 g of silica fume powder, 128 g of sulphoaluminate cement, 120 g of slag powder, 11.2 g of water reducer and 12.8 g of plastic expansion agent, PO42.5 Portland cement: silica fume powder: Sulphoaluminate cement: slag powder: water reducing agent: plastic expansion agent==75:8:8:7.5:0.7:0.8.

[0048] 2) Pour the weighed raw materials into the mixing container in turn, and stir evenly.

[0049] 3) Weigh 630g of water according to the water-cement ratio of 0.315:1, slowly add it into the above stirring container, and stir while adding water; after the addition, continue to fully stir for 15 minutes to obtain an inorgan...

Embodiment 2

[0055] The specific operation steps for preparing inorganic composite grouting material are as follows:

[0056] 1) At room temperature, weigh 1500g of dry base material, 500g of fly ash and 2g of chopped carbon fiber, base material: fly ash: chopped carbon fiber=3:1:0.004; base material is made of PO42.5 silicate Prepared by mixing 1125 g of cement, 120 g of silica fume powder, 120 g of sulphoaluminate cement, 112.5 g of slag powder, 10.5 g of water reducing agent and 12.0 g of plastic expansion agent, PO42.5 Portland cement: silica fume powder: Sulphoaluminate cement: slag powder: water reducing agent: plastic expansion agent==75:8:8:7.5:0.7:0.8.

[0057] 2) Pour the weighed raw materials into the mixing container in turn, and stir evenly.

[0058] 3) Weigh 620g of water according to the water-cement ratio of 0.31:1, slowly add it into the above stirring container, and stir while adding water; after the addition, continue to fully stir for 15 minutes to obtain an inorganic ...

Embodiment 3

[0064] The specific operation steps for preparing inorganic composite grouting material are as follows:

[0065] 1) At room temperature, weigh 1400g of dry base material, 300g of PO52.5 cement, 300g of fly ash and 2g of chopped carbon fiber, base material: PO52.5 cement: fly ash: chopped carbon fiber=7:1.5: 1.5:0.01; the base material is prepared by uniformly mixing 1050g of PO42.5 Portland cement, 112g of silica fume powder, 112g of sulphoaluminate cement, 105g of slag powder, 9.8g of water reducing agent and 11.2g of plastic expansion agent, PO42.5 Portland cement: silica fume powder: sulphoaluminate cement: slag powder: water reducer: plastic expansion agent==75:8:8:7.5:0.7:0.8.

[0066] 2) Pour the weighed raw materials into the mixing container in turn, and stir evenly.

[0067] 3) Weigh 620g of water according to the water-cement ratio of 0.31:1, slowly add it into the above stirring container, and stir while adding water; after the addition, continue to fully stir for ...

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