Backfill material matching rock wave impedance and preparation method thereof

Abstract

The application discloses backfill material matched with rock wave impedance and a preparation method thereof, which comprises the following raw materials in parts by weight: 45-70 parts of Portland cement, 40-189 parts of mineral admixture, 0.1-0.3 parts of plastic expansion agent, 5-10 parts of UEA expansion agent, 0.9-3.4 parts of superabsorbent resin, 28-54 parts of water, wherein the mineral admixture is mineral powder, quartz sand or fly ash, and the rest is water reducing agent or water retaining agent to make the saturated water absorption rate more than 180-600 times. The application incorporates the superabsorbent resin with adjustable size and particle size as the adjusting material, adds the artificially controllable closed pores in the rock backfill material, achieves the effect of adjusting the pore structure, and solves the problems of data distortion caused by the mismatching of the backfill material with different rock wave impedance, stress wave propagation law, mechanical properties and the like during the rock blasting data transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of backfill materials, in particular to a backfill material matching the wave impedance of rock and a preparation method thereof. BACKGROUND

[0002] Water-absorbing resin is a kind of high polymer material with high water-absorbing property, which can absorb water hundreds of times of its own weight. This material usually has a three-dimensional cross-linked network structure, which contains a large number of hydrophilic groups, making it have very high water-absorbing and water-retaining properties.

[0003] In some applications, in order to achieve the purpose of matching the wave impedance of rock, materials with specific properties are needed. By regulating the pore structure of water-absorbing resin, the physical properties of the material such as density, elastic modulus, acoustic impedance, etc. can be changed to match the wave impedance of rock. Therefore, a backfill material matching the wave impedance of rock and a preparation method thereof are needed. SUMMARY

[0004] The purpose of the present application is to provide a backfill material matching the wave impedance of rock and a preparation method thereof.

[0005] To achieve the above purpose, the present application is implemented according to the following technical solutions:

[0006] The present application comprises the following raw materials in parts by weight: Portland cement 45-70 parts, mineral admixture 40-189 parts, plastic expansion agent 0.1-0.3 parts, UEA expansion agent 5-10 parts, superabsorbent resin 0.9-3.4 parts, water 28-54 parts, the mineral admixture being mineral powder, quartz sand or fly ash, water reducing agent 0.2-0.7 parts, water retaining agent 0-0.6 parts.

[0007] Further, the Portland cement is P·O 52.5R cement.

[0008] Further, the water reducing agent is polycarboxylic acid high-performance water reducing agent, and the water retaining agent is hydroxypropyl methylcellulose.

[0009] Further, it comprises the following raw materials in parts by weight: Portland cement 50-70 parts, mineral powder 25-45 parts, quartz sand 47.5-144 parts, plastic expansion agent 0.1-0.3 parts, UEA expansion agent 5-8 parts, superabsorbent resin 0.9-2.1 parts, water 28-38 parts, the density of rock material being 1900-2100 kg·m -3 , the wave velocity being 3.3-3.7 km·s -1 , the wave impedance being 6300-7500*10 - 3 kg·m -2 ·s -1The mineral admixture includes mineral powder and quartz sand, and the mineral powder and the quartz sand are in a weight ratio of (25-45):(47.5-144).

[0010] Further, the high water-absorbing resin has a particle size of 200 mesh, 300 mesh or 400 mesh, and a saturated water absorption of not less than 180 times.

[0011] Further, the raw materials include silicate cement 45-50 parts, mineral admixture 40-45 parts, plastic expansion agent 0.1-0.3 parts, UEA expansion agent 5-10 parts, high water-absorbing resin 2.1-3.4 parts, and water 36-54 parts, the mineral admixture is fly ash, the rock material has a density of 1300-1500 kg·m -3 , a wave velocity of 2.0-2.3 km·s -1 , a wave impedance of 2600-3500*10 -3 kg·m -2 ·s -1 , and a compressive strength of 3.70-12.00 MPa.

[0012] Further, the water-absorbing resin has a particle size of 40 mesh, 60 mesh or 100 mesh, and a saturated water absorption of not less than 600 times.

[0013] In another aspect, a method for preparing a backfill material matching the wave impedance of rock includes the following steps:

[0014] A silicate cement 45-70 parts, mineral admixture 40-189 parts, plastic expansion agent 0.1-0.3 parts, UEA expansion agent 5-10 parts, high water-absorbing resin 0.9-3.4 parts, and water 28-54 parts are poured into a mixer and stirred slowly for 0.5-1.5 min until uniform;

[0015] B a water reducing agent or water retaining agent is added to make the saturated water absorption more than 180-600 times, and the mixture is stirred slowly for 5-8 min until fully dissolved and then added into the mixer to continue stirring with the powder until uniform.

[0016] The present application has the following advantages:

[0017] Compared with the prior art, the present application has the following technical effects:

[0018] 1) The present application mainly aims at different rock masses and proposes a backfill material matching the wave impedance of rock, which has a simple preparation method, a wide source of required materials, low cost, no toxic effect and wide practicability compared with the previous rock mass backfill materials.

[0019] 2) The application incorporates a high water-absorbing resin with adjustable size and particle size as a regulating material, adds artificially controllable closed pores in the rock backfill material, achieves the effect of regulating the pore structure, and prepares a backfill material matching the rock wave impedance, solving the problem of data distortion caused by the mismatch between the backfill material and different rock wave impedances, stress wave propagation rules, mechanical properties, etc. in rock blasting data transmission BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a schematic diagram of a 30-fold magnification SEM image of Example 1 of the rock wave impedance matching backfill material of the application;

[0021] Figure 2 Figure 2 is a schematic diagram of a 30-fold magnification SEM image of Example 2 of the rock wave impedance matching backfill material of the application. DETAILED DESCRIPTION

[0022] The application will be further described below through specific examples, and the illustrative examples of the application and the description are used to explain the application, but not as a limitation of the application.

[0023] The rock wave impedance matching backfill material and the preparation method thereof of the application comprise the following steps:

[0024] As shown in the figure, in the embodiment, the following steps are included: Figure 1

[0025] A Pouring silicate cement 45-70 parts by weight, mineral admixture 40-189 parts, plastic expansive agent 0.1-0.3 parts, UEA expansive agent 5-10 parts, high water-absorbing resin 0.9-3.4 parts, and water 28-54 parts into a mixer and stirring slowly for 0.5-1.5 min until uniform;

[0026] B Adding water reducing agent or water retaining agent to make the saturated water absorption rate 180-600 times or more, slowly stirring for 5-8 min, and then adding into the mixer after fully stirring and dissolving to continue stirring with the powder until uniform, to prepare the rock wave impedance matching material.

[0027] Examples 1-4 are materials suitable for matching the wave impedance of rock 1.

[0028] Example 1:

[0029] The rock wave impedance matching backfill material of the embodiment comprises, by weight: silicate cement 70 parts, mineral powder 25 parts, quartz sand 114 parts, plastic expansive agent 0.1 part, UEA expansive agent 5 parts, high water-absorbing resin 1.5 parts, water 28.5 parts, and water reducing agent 0.7 parts.​

[0030] A backfill material matching the wave impedance of rock in this example is prepared according to the above method.

[0031] Example 2:

[0032] A backfill material matching the wave impedance of rock in this example, according to parts by weight, includes: Portland cement 70 parts, mineral powder 25 parts, quartz sand 114 parts, plastic expansion agent 0.1 part, UEA expansion agent 5 parts, super absorbent resin 2.1 parts, water 28.5 parts, water reducing agent 0.5 parts.

[0033] A backfill material matching the wave impedance of rock in this example is prepared according to the above method.

[0034] Example 3:

[0035] A backfill material matching the wave impedance of rock in this example, according to parts by weight, includes: Portland cement 50 parts, fly ash 40 parts, plastic expansion agent 0.1 part, UEA expansion agent 10 parts, super absorbent resin 2.1 parts, water 45 parts, water reducing agent 0.3 parts, water retaining agent 0.3 parts.

[0036] A backfill material matching the wave impedance of rock in this example is prepared according to the above method.

[0037] Example 4:

[0038] A backfill material matching the wave impedance of rock in this example, according to parts by weight, includes: Portland cement 70 parts, mineral powder 25 parts, quartz sand 114 parts, plastic expansion agent 0.3 parts, UEA expansion agent 5 parts, super absorbent resin 0.9 parts, water 38 parts, water reducing agent 0.4 parts.

[0039] A backfill material matching the wave impedance of rock in this example is prepared according to the above method.

[0040] Examples 5-8 are suitable for materials matching the wave impedance of rock 2.

[0041] Example 5:

[0042] A backfill material matching the wave impedance of rock in this example, according to parts by weight, includes: Portland cement 50 parts, fly ash 40 parts, plastic expansion agent 0.1 part, UEA expansion agent 10 parts, super absorbent resin 2.1 parts, water 45 parts, water reducing agent 0.3 parts, water retaining agent 0.3 parts.

[0043] A backfill material matching the wave impedance of rock in this example is prepared according to the above method.

[0044] Example 6:

[0045] The backfill material matching rock wave impedance of the embodiment is prepared according to the above method.

[0046] The backfill material matching rock wave impedance of the embodiment is prepared according to the above method.

[0047] Embodiment 7:

[0048] The backfill material matching rock wave impedance of the embodiment is prepared according to the above method.

[0049] The backfill material matching rock wave impedance of the embodiment is prepared according to the above method.

[0050] Embodiment 8:

[0051] The backfill material matching rock wave impedance of the embodiment is prepared according to the above method.

[0052] The backfill material matching rock wave impedance of the embodiment is prepared according to the above method.

[0053] As shown in Figure 1 , the SEM image of 30 times magnification added with water absorption resin of embodiment 1 can be seen that the hole left by water absorption resin in rock body similar material is different from the hole formed by free water, but presents closed shape. As shown in Figure 2 , the SEM image of 30 times magnification added with water absorption resin of embodiment 2. Compared with Figure 1 , it can be seen that with the increase of water absorption resin content, the porosity of the material inside is improved, and the hole becomes more dense.

[0054] The 28d density, wave speed and compressive strength of the rock body backfill material prepared in the above embodiments 1-8 are tested, and the specific test results are shown in the following table 2:

[0055] Table 2

[0056]

[0057] From the test results of Table 1, it can be seen that the mechanical properties and wave impedance of each embodiment and its simulated rock are matched. With the increase of the content of the water-absorbing resin, the internal water environment of the concrete changes due to the addition of the water-absorbing resin, a large amount of porosity is formed in the material, the density and wave velocity of the specimen are reduced, and the additional water absorption of the increased water-absorbing resin will cause the original water-binder ratio to increase, which will reduce the strength of the concrete. However, the addition of water-absorbing resin of different specifications and particle sizes has different effects on the wave velocity and density of the material, because the closed pore diameter and porosity formed in the material by water-absorbing resin of different particle sizes are different. Therefore, the addition of water-absorbing resin of different particle sizes can adjust the pore structure of the cement-based material, so that the density and wave velocity and the compressive strength of the material are matched with the rock, and the material with matched wave impedance with the rock is obtained.

[0058] The porosity of the material prepared in the above embodiments 1-8 is tested, and the specific results are shown in Table 3 as follows:

[0059] Table 3

[0060]

[0061] From the data in Table 3, it can be seen that with the increase of the content of the water-absorbing resin, the porosity of the material also increases, the porosity of the material with high wave impedance is small, and the porosity of the material with low wave impedance is large. This is because the water-absorbing resin swells several times during mixing, and after hardening, it gradually releases water and shrinks, leaving a hole at its original position. The dry water-absorbing resin will be saturated with water after contacting with water, forming a stable unit, entering the interior of the cement mortar. With the hydration of cement, the water in the water-absorbing resin will be absorbed into the capillary pores and consumed, while the water-absorbing resin at the original position becomes the initial state without water absorption, and a pore is formed. Therefore, the addition of water-absorbing resin will increase the number of pores in the interior of the specimen, and water-absorbing resin of different particle sizes will also form pores of different diameters in the interior. By adjusting the internal pore structure, the density and wave velocity of the specimen are changed, and the wave impedance of the specimen is matched with the rock.

[0062] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A backfill material that matches the rock wave impedance, characterized in that, When the density of the rock material is 1900-2100 kg·m -3 , the wave velocity is 3.3-3.7 km·s -1 , the wave impedance is 6300-7500*10 -3 kg·m -2 ·s -1 , and the compressive strength is 30.00-58.00 MPa, the backfill material comprises the following raw materials in parts by weight: 50-70 parts of Portland cement, 25-45 parts of mineral admixture including mineral powder and 47.5-144 parts of quartz sand, 0.1-0.3 parts of plastic expansive agent, 5-8 parts of UEA expansive agent, 0.9-2.1 parts of high water absorption resin, 28-38 parts of water, and 0.4-0.7 parts of water reducing agent, wherein the high water absorption resin has a particle size of 200 mesh, 300 mesh or 400 mesh, and a saturated water absorption rate of not less than 180 times. or, when the density of the rock material is 1300-1500 kg·m -3 , the wave velocity is 2.0-2.3 km·s -1 , the wave impedance is 2600-3500*10 -3 kg·m -2 ·s -1 , and the compressive strength is 3.70-12.00 MPa, the backfill material comprises the following raw materials in parts by weight: 45-50 parts of Portland cement, 40-45 parts of mineral admixture, 0.1-0.3 parts of plastic expansive agent, 5-10 parts of UEA expansive agent, 2.1-3.4 parts of superabsorbent resin, 36-54 parts of water, 0.2-0.4 parts of water reducing agent, and 0.2-0.6 parts of water retaining agent, wherein the mineral admixture is fly ash, and the superabsorbent resin has a particle size of 40 mesh, 60 mesh, and 100 mesh and a saturated water absorption rate of no less than 600 times.

2. The backfill material matching rock wave impedance according to claim 1, characterized in that, The portland cement is P·O 52.5R cement.

3. The backfill material matching rock wave impedance according to claim 1, characterized in that, The water reducing agent is a polycarboxylic high performance water reducing agent.

4. A method of preparing a backfill material that matches the rock wave impedance for use in the backfill material of claim 1, characterized by, The method comprises the following steps A. Portland cement, mineral admixture, plastic expansion agent, UEA expansion agent, super absorbent resin and water are poured into a mixer and stirred slowly for 0.5-1.5 min until uniform; B. The water reducing agent and / or water retaining agent are added, and stirred slowly for 5-8 min until fully stirred and dissolved, and then added into the mixer to continue stirring with the powder until mixed uniformly, thereby obtaining the backfill material matching the rock wave impedance.

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