CN111257513A - Continuous filling experimental device and method for cement cementing material - Google Patents
Continuous filling experimental device and method for cement cementing material Download PDFInfo
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- CN111257513A CN111257513A CN202010089804.9A CN202010089804A CN111257513A CN 111257513 A CN111257513 A CN 111257513A CN 202010089804 A CN202010089804 A CN 202010089804A CN 111257513 A CN111257513 A CN 111257513A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N2033/0003—Composite materials
Abstract
The invention discloses a continuous filling experimental device and an experimental method of a cement cementing material, which comprises the following steps: the device comprises a cylindrical inner layer PVC pipe, a cylindrical outer layer PVC pipe, a heating table, a filling funnel, a laser range finder, heat insulation cotton, a water pressure sensor and a temperature sensor. The inlayer PVC pipe is cased in outer PVC pipe, and inlayer PVC socle bottom is equipped with the warm table, and the space between the outer wall of inlayer PVC pipe and the inner wall of outer PVC pipe is filled through thermal-insulated cotton. The side walls of the inner layer PVC pipe and the outer layer PVC pipe are both provided with through holes, and the through holes are provided with a water pressure sensor and a temperature sensor; the filling funnel is arranged right above the opening of the inner layer PVC pipe. The laser range finder is fixed on the opening edge of the inner layer PVC pipe. The invention has the advantages that: the influence of factors such as different filling rates, different initial and boundary temperatures on the behavior characteristics of the filling body can be researched, and the method has important theoretical and engineering significance for realizing safe, clean and efficient mining of mines.
Description
Technical Field
The invention relates to the technical field of goaf backfilling, in particular to a continuous filling experimental device and an experimental method for a cement cementing material.
Background
Underground mining inevitably produces a large amount of tailing waste and underground goafs while providing necessary mineral resources for socioeconomic development, and seriously threatens the safe production of mines and the natural ecological environment (Wu love, Wang Yong, Wang hong Jiang.2016. paste filling technical status and trend. metal mine (7), 1-9). Conventional surface treatment methods for tailings are accompanied by risks such as tailings dam breakages and water source pollution caused by acidic wastewater discharge, and the existence of goafs may cause a series of engineering and environmental problems such as underground rock Fall and surface collapse (Ghirian, a., Fall, m.2013.coupled coherent-hydraulic-mechanical-chemical admixture. p art I, Physical, hydraulic and thermal processes and engineering biology 164, 195-207). The ever-increasing environmental demands and public awareness of environmental protection are forcing the mining industry to seek more efficient and competitive methods for comprehensive treatment of tailings and mined-out areas (Kempton, H., Bloomfield, T.A., Hanson, J.L., et al.2010.Policy requirements and requirements from new resources. environmental Science and Policy 13 (6); 558-) -566).
The tailing cemented paste filling technology utilizes tailings to fill Underground goaf remained after mining of ore pillars, which not only can avoid large exposure and accumulation of solid wastes such as tailings and the like on the ground surface, but also can improve the stability of surrounding rocks of Underground stopes (Fall, m., benzazoua, m., Saa, e.g.2008.mix reporting of undegarred surrounding rocks, cementing and undegarred Space T technology 23(1), 80-90; Wu's auspicious, Jiangjiangguan, Wang mussel 2018. summary and development trend of novel filling cementing materials of mines metal mines (3), 1-6). The tailings-goaf cooperative disposal technology has become one of important technical approaches for breaking through the bottleneck of the existing resources, energy and environment restrictions and realizing safe, clean and efficient mining of mines (Fall, m., telestin, j.c., Pokharel, m., toure, m.2010. acontri timing to understating the effects of curing temperature on the mechanical properties of mining aided details background. engineering gel 114, 397-413).
In order to meet the requirements of transportation efficiency and strength, enough water and cementing agents (such as cement and the like) are added into the tailings before the tailings are backfilled into the goaf. The behavior of the pack will lead to a complex spatio-temporal evolution under the combined influence of the multi-physics processes of heat exchange of the pack with the surrounding rock, cement hydration product formation with heat release and water consumption, water evaporation and thermal expansion deformation due to temperature changes, pack drainage through surrounding rock fractures and stope walls, thermal convection due to seepage fields, and consolidation and settlement of the pack itself (Ghirian, a., Fall, m.2013.coupled thermal-hydraulic-mechanical-chemical admixture of spent pack in column experiment, part I, Physical, hydraulic and thermal processes and engineering science 164, 195-207). The filling force applied to the retaining wall during filling is the most important issue in the prior art as the key structure for maintaining the stability of the filling. According to the effective stress principle, under the action of given total stress, the effective stress of the filler framework is determined by the pore water pressure, so that a great deal of experimental research work is carried out by the predecessor aiming at the pore water pressure evolution rule of the filling material.
In the prior art, sensors are arranged at different positions of a filling device, and the evolution law of monitoring the water pressure, the temperature and the like of a filling body is as follows: ghirian, A., Fall, M.2013.coupled thermo-hydro-mechanical-chemical analysis of segmented negative feedback in column experiment I, Physical, hydro-and thermal processes and characteristics engineering geography 164, 195- "207;
Belem,T.,Aatar,O.E.,and Bussière,B.,et al.2016.Gravity-dri ven 1-Dconsolidation of cemented paste backfill in 3-m-high columns.InnovativeInfrastructure Solutions.1:37；
cui, L., Fall, M.2016.mechanical and thermal properties of center materials at early, information of initial temperature, curingstress and traction conditions, construction and Building materials 125, 553-.
The defects of the prior art are as follows:
1. the behavior of the filling body during continuous filling cannot be studied: in the existing experimental work, the filled filling body is taken as a research object, so that the behavior characteristic evolution of the filling body in the continuous filling process cannot be described, and the influence of the filling rate and the like on the behavior characteristic of the filling body cannot be researched.
2. The effect of the initial and boundary temperatures on the behavior of the pack cannot be studied: with the continuous increase of the mining activity depth, the ground temperature gradient can lead the ambient temperature of the stope to continuously rise, so the influence of the temperature field on the behavior characteristics of the filling body is more obvious. However, the above experimental scheme (a) is performed at room temperature, and thus the influence of the initial temperature and the boundary temperature on the behavior of the filling body cannot be reflected; although the above experimental scheme (b) can perform testing work under different initial temperature conditions, the influence of the boundary temperature on the behavior characteristics of the filling body cannot be reflected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a continuous filling experimental device and an experimental method for a cement cementing material, and solves the defects in the prior art.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a continuous filling experiment device for cement binding materials comprises: the device comprises a cylindrical inner layer PVC pipe 1, a cylindrical outer layer PVC pipe 2, a heating platform 3, a filling funnel 4, a laser range finder 5, heat insulation cotton 6, a water pressure sensor 7 and a temperature sensor 8.
The diameter of the inner layer PVC pipe 1 is smaller than that of the outer layer PVC pipe 2, the inner layer PVC pipe 1 is sleeved in the outer layer PVC pipe 2, the inner layer PVC pipe 1 and the outer layer PVC pipe 2 are concentric, the heating table 3 is arranged at the bottom of the inner layer PVC pipe 1, and a gap between the outer wall of the inner layer PVC pipe 1 and the inner wall of the outer layer PVC pipe 2 is filled with heat insulation cotton 6.
The through-hole has all been opened to the lateral wall of inlayer PVC pipe 1 and outer PVC pipe 2, and the through-hole position is for heating table 3 above six heights of 0%, 10%, 30%, 50%, 70%, 90% of PVC pipe total length, and inlayer PVC pipe 1 and outer PVC pipe 2 all open and have two through-holes, and inlayer PVC pipe 1 and outer PVC pipe 2 respectively open promptly have 12 through-holes, and every highly has four through-holes at same straight line after inlayer PVC pipe 1 and outer PVC pipe 2 equipment.
A water pressure sensor 7 and a temperature sensor 8 are respectively arranged in through holes with the same height of the inner layer PVC pipe 1 and the outer layer PVC pipe 2;
the filling funnel 4 is arranged right above the opening of the inner layer PVC pipe 1. The laser range finder 5 is fixed on the opening edge of the inner layer PVC pipe 1 and is used for measuring the height of the filling material in the inner layer PVC pipe 1.
The invention also discloses a filling material preparation system, which comprises: a water bath device 9 and a stirring device 10;
the water bath device 9 is provided with a plurality of water baths 11, and the water baths 11 are used for preheating tailings or tap water to the specified temperature of the experiment.
The stirring device 10 is provided with a stirring pot 12, a stirrer 13 is arranged above the stirring pot 12, and the stirring pot 12 is used for uniformly stirring and mixing the preheated tailings, tap water and newly added cement in the water bath.
The specific experimental process based on the device is as follows:
1. the temperature of a heating table 3 of the filling experiment device is set to be Tb1。
2. Adding tailings and tap water at the temperature T01Is preheated in the water bath 11.
3. According to a given filling material formula, a certain amount of cement, preheated tailings and tap water are added into the stirring pot 12 and uniformly mixed to form the filling material.
4. The filling material is deposited into the inner layer PVC pipe 1 through the filling funnel 4 at a constant speed, the water pressure sensor 7 and the temperature sensor 8 are used for monitoring the temperature and the water pressure evolution law of the filling body in the continuous filling process in real time, and the height of the filling material is monitored in real time through the laser range finder 5.
5. At regular intervals t1Repeating the steps 2, 3 and 4 to ensure that the continuous filling process is realized, and simultaneously calculating and maintaining the constant filling rate m through the monitored height of the filling body1。
6. Obtaining a temperature T of the filling body at the bottom boundaryb1Initial temperature of T01In m1The rate of the continuous filling is used for carrying out the behavior characteristic evolution rule caused by the continuous filling.
7. Changing the temperature of the heating stage 3 to Tb2Changing the temperature of the water bath 11 to T02Changing the filling time interval to t2And further changing the filling rate to m2Repeating the steps 2, 3, 4 and 5 to obtain the filling body with the bottom boundary temperature of Tb2Initial temperature of T02In m2The rate of the continuous filling is used for carrying out the behavior characteristic evolution rule caused by the continuous filling.
Compared with the prior art, the invention has the advantages that:
the method can monitor the water pressure and temperature evolution rule of the tailing cemented filling body with different initial and boundary temperatures in the continuous filling process, and further realizes the research on the influence of factors such as different filling rates, different initial and boundary temperatures on the behavior characteristics of the filling body.
Drawings
FIG. 1 is a schematic structural view of an experimental apparatus for continuous filling of a cementitious material according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a filling material preparation system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings by way of examples.
As shown in fig. 1, a continuous filling test device for cement binder includes: the device comprises a cylindrical inner layer PVC pipe 1, a cylindrical outer layer PVC pipe 2, a heating platform 3, a filling funnel 4, a laser range finder 5, heat insulation cotton 6, a water pressure sensor 7 and a temperature sensor 8.
The diameter of the inner layer PVC pipe 1 is smaller than that of the outer layer PVC pipe 2, the inner layer PVC pipe 1 is sleeved in the outer layer PVC pipe 2, the inner layer PVC pipe 1 and the outer layer PVC pipe 2 are concentric, the heating table 3 is arranged at the bottom of the inner layer PVC pipe 1, and a gap between the outer wall of the inner layer PVC pipe 1 and the inner wall of the outer layer PVC pipe 2 is filled with heat insulation cotton 6.
The through-hole has all been opened to the lateral wall of inlayer PVC pipe 1 and outer PVC pipe 2, and the through-hole position is 0%, 10%, 30%, 50%, 70%, 6 height of PVC pipe total length more than 3 faces of warm table, and inlayer PVC pipe 1 and outer PVC pipe 2 all open and have two through-holes, and inlayer PVC pipe 1 and outer PVC pipe 2 respectively open promptly have 12 through-holes, and every highly has 4 through-holes at same straight line after inlayer PVC pipe 1 and outer PVC pipe 2 equipment.
A water pressure sensor 7 and a temperature sensor 8 are respectively arranged in through holes with the same height of the inner layer PVC pipe 1 and the outer layer PVC pipe 2;
the filling funnel 4 is arranged right above the opening of the inner layer PVC pipe 1. The laser range finder 5 is fixed on the opening edge of the inner layer PVC pipe 1 and is used for measuring the height of the filling material in the inner layer PVC pipe 1.
As shown in fig. 2, a filling material preparation system includes: a water bath device 9 and a stirring device 10;
the water bath device 9 is provided with a plurality of water baths 11, and the water baths 11 are used for preheating tailings or tap water to the specified temperature of the experiment.
The stirring device 10 is provided with a stirring pot 12, a stirrer 13 is arranged above the stirring pot 12, and the stirring pot 12 is used for uniformly stirring and mixing the preheated tailings, tap water and newly added cement in the water bath.
The specific experimental process based on the device is as follows:
1. the temperature of a heating table 3 of the filling experiment device is set to be Tb1。
2. Adding tailings and tap water at the temperature T01Is preheated in the water bath 11.
3. According to a given filling material formula, a certain amount of cement, preheated tailings and tap water are added into the stirring pot 12 and uniformly mixed to form the filling material.
4. The filling material is deposited into the inner layer PVC pipe 1 through the filling funnel 4 at a constant speed, the water pressure sensor 7 and the temperature sensor 8 are used for monitoring the temperature and the water pressure evolution law of the filling body in the continuous filling process in real time, and the height of the filling material is monitored in real time through the laser range finder 5.
5. At regular intervals t1Repeating the steps 2, 3 and 4 to ensure that the continuous filling process is realized, and simultaneously calculating and maintaining the constant filling rate m through the monitored height of the filling body1。
6. Obtaining a temperature T of the filling body at the bottom boundaryb1Initial temperature of T01In m1The rate of the continuous filling is used for carrying out the behavior characteristic evolution rule caused by the continuous filling.
7. Changing the temperature of the heating stage 3 to Tb2Changing the temperature of the water bath 11 to T02Changing the filling time interval to t2And further changing the filling rate to m2Repeating the steps 2, 3, 4 and 5 to obtain the filling body with the bottom boundary temperature of Tb2Initial temperature of T02In m2The rate of the continuous filling is used for carrying out the behavior characteristic evolution rule caused by the continuous filling.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (3)
1. A continuous filling experiment device for cement binding materials comprises: the device comprises a cylindrical inner layer PVC pipe (1), a cylindrical outer layer PVC pipe (2), a heating table (3), a filling funnel (4), a laser range finder (5), heat insulation cotton (6), a water pressure sensor (7) and a temperature sensor (8);
the inner PVC pipe (1) is smaller than the outer PVC pipe (2) in diameter, the inner PVC pipe (1) is sleeved in the outer PVC pipe (2), the inner PVC pipe (1) and the outer PVC pipe (2) are concentric, a heating table (3) is arranged at the bottom of the inner PVC pipe (1), and a gap between the outer wall of the inner PVC pipe (1) and the inner wall of the outer PVC pipe (2) is filled with heat insulation cotton (6);
the side walls of the inner layer PVC pipe (1) and the outer layer PVC pipe (2) are respectively provided with a through hole, the through holes are positioned at six heights of 0%, 10%, 30%, 50%, 70% and 90% of the total length of the PVC pipe above the surface of the heating table (3), the inner layer PVC pipe (1) and the outer layer PVC pipe (2) are respectively provided with two rows of through holes, namely, the inner layer PVC pipe (1) and the outer layer PVC pipe (2) are respectively provided with (12) through holes, and after the inner layer PVC pipe (1) and the outer layer PVC pipe (2) are assembled, each height is provided with four through holes in the same straight line;
a water pressure sensor (7) and a temperature sensor (8) are respectively arranged in through holes at the same height of the inner layer PVC pipe (1) and the outer layer PVC pipe (2);
the filling funnel (4) is arranged right above the opening of the inner layer PVC pipe (1); the laser range finder (5) is fixed at the opening edge of the inner layer PVC pipe (1) and is used for measuring the height of the filling material in the inner layer PVC pipe (1).
2. A filling material preparation system, comprising: a water bath device (9) and a stirring device (10);
a plurality of water baths (11) are arranged on the water bath device (9), and the water baths (11) are used for preheating tailings or tap water to an experimental specified temperature;
be equipped with agitator kettle (12) on agitating unit (10), agitator (13) are equipped with to agitator kettle (12) top, and agitator kettle (12) are arranged in stirring the misce bene with tailing, running water and the cement of newly adding after preheating in the water bath.
3. A continuous filling experiment method of cement cementing materials is characterized in that: the following experiment was conducted using a continuous filling experimental apparatus for cement binder and a filling material preparation system:
1. heating table for filling experimental device(3) Temperature is set to Tb1；
2. Adding tailings and tap water at the temperature T01Preheating in the water bath (11);
3. according to a given filling material formula, a certain amount of cement, preheated tailings and tap water are added into a stirring pot (12) and are uniformly mixed to form a filling material;
4. the filling material is deposited into the inner layer PVC pipe (1) through a filling funnel (4) at a constant speed, the temperature and the water pressure evolution rule of a filling body in the continuous filling process are monitored in real time by using a water pressure sensor (7) and a temperature sensor (8), and the height of the filling material is monitored in real time by using a laser range finder (5);
5. at regular intervals t1Repeating the steps 2, 3 and 4 to ensure that the continuous filling process is realized, and simultaneously calculating and maintaining the constant filling rate m through the monitored height of the filling body1；
6. Obtaining a temperature T of the filling body at the bottom boundaryb1Initial temperature of T01In m1The behavior characteristic evolution law caused by continuous filling is carried out at the rate of (2);
7. changing the temperature of the heating table (3) to Tb2Changing the temperature of the water bath (11) to T02Changing the filling time interval to t2And further changing the filling rate to m2Repeating the steps 2, 3, 4 and 5 to obtain the filling body with the bottom boundary temperature of Tb2Initial temperature of T02In m2The rate of the continuous filling is used for carrying out the behavior characteristic evolution rule caused by the continuous filling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983196A (en) * | 2020-09-02 | 2020-11-24 | 四川大学 | Underground filling method based on multi-field coupling model and application thereof |
| CN114923826A (en) * | 2022-05-07 | 2022-08-19 | 四川大学 | Deep high-temperature rheological deposit tailing filling body pore water pressure simulation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982804A (en) * | 2018-05-27 | 2018-12-11 | 西安科技大学 | Mine filling temperature, seepage flow, stress THM coupling similar test device and method |
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- 2020-02-13 CN CN202010089804.9A patent/CN111257513A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982804A (en) * | 2018-05-27 | 2018-12-11 | 西安科技大学 | Mine filling temperature, seepage flow, stress THM coupling similar test device and method |
Non-Patent Citations (7)
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983196A (en) * | 2020-09-02 | 2020-11-24 | 四川大学 | Underground filling method based on multi-field coupling model and application thereof |
| CN111983196B (en) * | 2020-09-02 | 2021-06-18 | 四川大学 | Underground filling method based on multi-field coupling model and application thereof |
| CN114923826A (en) * | 2022-05-07 | 2022-08-19 | 四川大学 | Deep high-temperature rheological deposit tailing filling body pore water pressure simulation method and application thereof |
| CN114923826B (en) * | 2022-05-07 | 2023-04-18 | 四川大学 | Deep high-temperature rheological deposit tailing filling body pore water pressure simulation method and application thereof |
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Application publication date: 20200609 |