CN118190722A - A test device and test method for simulating water-rock interaction - Google Patents

Abstract

The invention discloses a test device and a test method for simulating the action of water rock, wherein the test device comprises: a rainfall infiltration module and a water rock action module; the rainfall infiltration module comprises a rainwater collection device, a pretreatment device and a monitoring device; the pretreatment device comprises a porous plate and a viscous soil seepage box; the monitoring device comprises a flowmeter, a monitoring bottle, an electrode and a multi-parameter instrument connected with the electrode through a wire; the water rock action module comprises an air entrainment device, a water rock action device and a sampling monitoring device; the water rock action device comprises a carbonate rock module, a silicate rock module, an evaporation rock module and a seepage groove. The invention solves the problem that the observation of the water rock effect is not intuitive in the traditional research process, constructs the high-pressure environment in the underground water migration process, and adds rock materials to successfully simulate the rock components of the underground.

Description

A test device and test method for simulating water-rock interaction

Technical Field

The invention relates to the technical field of hydrogeological chemistry experiments, and more particularly to an experimental device and an experimental method for simulating water-rock interaction.

Background technique

The utilization of rainwater has gradually attracted people's attention. Methods for rainwater collection and utilization have been continuously proposed. Countries such as the United States and Japan have carried out a lot of research and application on rainwater infiltration to replenish groundwater. At the same time, rainwater and groundwater have different sources. The two will mix underground. In addition, the water-rock-gas interaction between them and aquifers such as carbonate rocks also changes the original physical, chemical properties and biological characteristics of groundwater, and has a certain impact on pore evolution. Therefore, it is of great scientific significance to study the mechanism of rainwater infiltration into fissure karst aquifers on groundwater level, water quality, water-rock interaction and its influencing factors, which can provide a scientific basis for artificial recharge of fissure karst aquifers.

The main purpose of using rainwater infiltration underground in my country is to control land subsidence and store underground energy. In-depth research on the formation process of rainwater-rock interaction and understanding the composition of the water under different conditions will help reveal this important process in geology.

At present, the hydrogeological research on the water-rock interaction of rainwater at home and abroad mainly focuses on the influence of the interaction between water and rock and soil media on the migration of groundwater solutes. The evolution law of groundwater is simulated by using hydrogeochemical simulation software, isotope method and numerical calculation method, and the evolution process and formation mechanism of groundwater are quantitatively analyzed. Considering that the results of chemical simulation calculations cannot intuitively reflect the process of rainwater-rock interaction, it is a good choice to conduct experiments to simulate the process of rainwater-rock interaction. However, there are two problems in simulating water-rock interaction through experiments. One is how to simulate the high pressure state underground, and the other is how to simulate the chemical composition of underground rocks. At present, there is no experimental device and experimental method for simulating water-rock interaction.

Summary of the invention

The purpose of the present invention is to provide a test device and a test method for simulating water-rock interaction, in order to solve the technical problems in the background technology.

In order to achieve the above object, the present invention adopts the following technical solutions:

On one hand, the present invention provides a test device for simulating water-rock interaction. The system comprises: a rainfall infiltration module and a water-rock interaction module.

The rainfall infiltration module includes a rainwater collection device, a pre-treatment device and a monitoring device; the rainwater collection device includes a water inlet tank, an overflow tank, a shell, a rain collecting box and a water outlet pipe; the rain collecting box is funnel-shaped and is located at the bottom of the rain collecting module, the shell is provided with a pre-treatment device, the water inlet tank is connected to the water inlet on the upper left part of the cylindrical shell, the overflow tank is connected to the overflow on the upper right part of the shell, rainwater flows into the shell from the water inlet tank outlet pipe, and a monitoring device is provided at the outlet of the water collecting box.

The pre-treatment device comprises a porous plate and a cohesive soil seepage box; the porous plate is located at the upper part of the shell, and the cohesive soil seepage box is equipped with three layers of retractable cohesive soil boxes.

The monitoring device includes a flow meter, a monitoring bottle, electrodes and a multi-parameter instrument connected to the electrodes by wires. The flow meter is installed on the water outlet of the rain collecting box. The bottom end of the water outlet of the rain collecting box leads to the monitoring bottle. A partition is provided on the bottom of the monitoring bottle where it is connected to the water outlet pipe, and the electrodes are located in the monitoring bottle.

The bottom of the pullable sticky soil box is provided with holes and a filter membrane.

The water-rock interaction module includes an aerating device, a water-rock interaction device, and a sampling and monitoring device; the aerating device includes an organic acid addition port, a carbon dioxide cylinder, a pressure pump, and an air inlet pipe; the water-rock interaction device includes a carbonate rock module, a silicate rock module, an evaporative rock module, and a seepage trough; the carbonate rock module includes a rectangular shell 1 and a carbonate rock seepage trough; the silicate rock module includes a rectangular shell 2, a rectangular shell 3, a rectangular shell 4, a rectangular shell 5 and a silicate rock seepage trough; the evaporative rock module includes a cube shell and an evaporative rock seepage trough; the sampling and monitoring device includes a conductivity sensor, a water intake valve, and a sampling tube.

The organic acid adding port is provided with a push-pull top cover.

Optionally, the rock material filled in the rectangular shell in the carbonate rock module includes but is not limited to limestone and dolomite.

Optionally, the rock material filled with the rectangular shell in the silicate rock mold includes but is not limited to granite and the like.

Optionally, the rock material filled in the cube shell in the evaporite module includes but is not limited to gypsum and anhydrite rock.

Optionally, the infiltration trough is filled with materials including but not limited to soil and sand.

The cube shell is provided with a movable end box.

Optionally, the number of the rectangular parallelepiped shells is set according to actual conditions.

Optionally, the conductivity sensor includes but is not limited to CLS16D and CLS82D sensors.

Another aspect of the present invention provides a test method for simulating water-rock action, the method adopts a test device for simulating water-rock action as described above, including: a water inlet box is connected to the upper left part of the shell by a water inlet pipe, an overflow box is connected to the upper right part of the shell by a water outlet pipe, the shell is installed to the upper end of the rain collecting box, the shell is divided into three layers from bottom to top, namely, a clay seepage box 3, a clay seepage box 2 and a clay seepage box 1, a porous plate is placed above the clay seepage box 1; the lower end of the rain collecting box is connected to a water guide pipe; a rain collecting box outlet is installed The monitoring device is installed; the organic acid addition port is connected to the water pipe; the carbon dioxide cylinder is connected to the pressure pump, and the pressure pump is connected to the water pipe; the water pipe is connected to the rectangular shell 1, and the water pipe is S-shaped and connects the rectangular shells of each module in turn, and the water pipe is provided with a water intake valve 1 and a conductivity sensor 1; the lower end of the rectangular shell 4 is connected to the square shell through the water pipe, and the water pipe is provided with a water intake valve 2 and a conductivity sensor 2; the upper end of the movable end box of the square shell is connected to the water pipe and the sampling tube, and the water pipe is provided with a conductivity sensor 3. All valves are closed, and each sensor is connected. Organic acid is added to the organic acid addition port, and the valve of the carbon dioxide cylinder and the pressure pump are opened to add water to the water inlet tank to a preset height; after the water flows out of the sampling tube at the end of the drain pipe evenly, each water intake valve is opened to sample; finally, the sensor data and the ion composition data in the water sample are sorted out for the analysis of the water-rock interaction mechanism.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention provides an experimental device and an experimental method for simulating water-rock interaction, which can be used to study the relevant mechanism of water-rock interaction indoors. The first advantage is that the pre-treatment work such as filtration and acidification required before the determination of various anions and cations and organic substances can be completed before the water-rock interaction; the second advantage is that various reagents can be flexibly added according to the preservation methods of different samples, and it has wide application value and the function of further development; the third advantage is that the test data at any time in the device can be obtained for theoretical calculation or actual data comparison and analysis; the fourth advantage is that the test operation is simple and easy to understand, and the test operation and maintenance costs are low.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and/or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

FIG1 shows a schematic diagram of an experimental device for simulating water-rock interaction according to an embodiment of the present application.

Description of reference numerals:

111. Water inlet tank, 112. Overflow tank, 113. Shell, 114. Rain collecting box, 115. Water outlet pipe, 121. Perforated plate, 122. Clay seepage box, 131. Flow meter, 132. Detection bottle, 133. Electrode, 134. Multi-parameter instrument, 211. Organic acid addition port, 212. Carbon dioxide cylinder, 213. Pressure pump, 214. Air inlet pipe, 221. Carbonate rock module, 222. Silicate rock module, 223. Evaporite rock module, 224. Seepage trough, 231. Conductivity sensor, 232. Water intake valve, 233. Sampling tube.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

The embodiments of the present application are described in detail below with reference to the accompanying drawings.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

The following will be combined with Figure 1 to clearly and completely describe a test device for simulating water-rock interaction involved in the embodiment of the present application. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

Application Example 1: This indoor physical experiment simulates the temporal variation of solute migration after rainwater infiltration under the same precipitation intensity in a certain area. On the one hand, some basic conclusions can be drawn, and on the other hand, it is convenient for further research on its temporal variation and composition change characteristics.

As shown in Figure 1, the test device includes a rainfall infiltration module and a water-rock interaction module.

The rainfall infiltration module includes a rainwater collection device, a pre-treatment device and a monitoring device; the rainwater collection device includes an inlet tank, an overflow tank, a shell, a rainwater collection box and a drain pipe; the inlet tank and the overflow tank are made of acrylic board as a whole, with a size of length × width × height = 35cm × 35cm × 35cm, a thickness of 0.5cm, and no top cover; the shell is made of acrylic board as a whole, with a size of length × width × height = 50cm × 50cm × 60cm, a thickness of 0.5cm, a shell with a removable top cover, and no bottom plate, and a pre-treatment device inside the shell, which includes a porous plate and a clay soil seepage box, and a three-layer drawer module is designed in the shell, each layer of drawers is a rectangular cavity of 49cm × 49cm × 18cm, and each layer of drawers has a lower end hole structure with a hole radius of 0.5cm, in order to achieve effective drainage function. The material of the drawer needs to have good water resistance and durability, and acrylic board is still selected after comprehensive consideration. The lower end of the shell is connected to the rain collecting box, and the overall shape of the rain collecting box is a square funnel. The side length of the upper end of the funnel is slightly larger than the shell. The material is still acrylic plate. Considering the thickness of the material itself, the side length of the upper end of the funnel is designed to be 52cm×52cm. The lower end of the funnel is still square, connected to a square acrylic column by UV glue, and the bottom is connected to the drain pipe. The above dimensions can also be any other values, and the present invention does not specifically limit this.

The end of the drainage pipe is connected to the water-rock action module, including a gas filling device, a water-rock action device and a sampling monitoring device; the gas filling device includes an organic acid addition port, a carbon dioxide gas cylinder, a pressure pump, and an air intake pipe; the organic acid addition port is made of fiberglass, with a size of length × width × height = 10cm × 10cm × 5cm, and a fiberglass thickness of 0.5cm. A push-pull top cover is provided to facilitate adding reagents at any time; the water-rock action device includes a carbonate rock module, a silicate rock module, and an evaporative rock module; the carbonate rock module includes a rectangular shell 1 and a carbonate rock seepage trough; the silicate rock module includes a rectangular shell 2, a rectangular shell 3, a rectangular shell 4, a rectangular shell 5 and a silicate rock Seepage trough; the evaporite module includes a cube shell and an evaporite seepage trough; the rectangular shell 1 has a size of length × width × height = 25cm × 25cm × 40cm, the rectangular shell 2, the rectangular shell 3, the rectangular shell 4 and the rectangular shell 5 have a size of length × width × height = 15cm × 15cm × 40cm, the square shell has a size of length × width × height = 30cm × 30cm × 30cm, the square shell is provided with a movable end cover, the rectangular shell and the square shell are both made of acrylic plate, the carbonate rock module and the silicate rock module are connected by a hard drainage pipe, the silicate rock module and the evaporite rock module are connected by a glass fiber reinforced plastic drainage pipe, and the seepage trough is filled with soil and sand. The above dimensions can also be any other values, and the present invention does not specifically limit this.

The conductivity sensor in this example uses a CLS16D sensor; the conductivity sensor may also be other types that meet the requirements, and the present invention does not make specific limitations on this.

This test simulates the change of solute migration over time after rainwater infiltration under the same precipitation intensity in a certain area. The water-rock interaction is based on the chemical or isotopic imbalance between fluids, groundwater and rocks. The summer with the most obvious characteristics is selected for simulation. By presetting the normal temperature and high pressure environment at 20-25℃ and the water inlet rate of the water inlet tank at 30ml/s, the environment of water-rock interaction after rainwater infiltration under natural conditions is simulated. Therefore, the entire test simulates 1 hour and 3 hours in summer by changing the test time. The above test ideas can be set arbitrarily according to the test requirements, and the present invention does not make specific limitations on this.

Fill the water-rock interaction module with rock materials and seepage trough materials, close all valves, connect all sensors, add organic acid to the organic acid addition port, open the carbon dioxide cylinder valve and pressure pump, and start the test.

S1: Add water to the water inlet tank to a preset height, and record the data of each sensor and the detection bottle in real time.

S2: Open each water intake valve, collect samples and detect their ion composition and concentration.

S3: After the test is completed, the obtained ion composition and concentration data are summarized and organized for the analysis of water-rock interaction mechanism.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. The utility model provides a test device and test method of simulation water rock effect which characterized in that includes: a rainfall infiltration module and a water rock action module; the rainfall infiltration module comprises a rainwater collection device, a pretreatment device and a monitoring device; the rainwater collecting device comprises a water inlet tank, an overflow tank, a shell, a rainwater collecting box and a water outlet pipe; the pretreatment device comprises a porous plate and a viscous soil seepage box; the monitoring device comprises a flowmeter, a monitoring bottle, an electrode and a multi-parameter instrument connected with the electrode through a wire; the water rock action module comprises an air entrainment device, a water rock action device and a sampling monitoring device; the air-entraining device comprises an organic acid adding port, a carbon dioxide gas cylinder, a pressure pump and an air inlet pipe; the water rock action device comprises a carbonate rock module, a silicate rock module, an evaporation rock module and a seepage groove; the sampling monitoring device comprises a conductivity sensor, a water sampling valve and a sampling tube;

the water rock action device fills rock materials to enable the rock materials to perform water rock action, so that various ions are separated out; the sampling monitoring device monitors the conductivity of the solution in real time in the water outlet process.

2. The test device for simulating water rock action of claim 1, wherein the rainfall infiltration module comprises a rainwater collection device, a pretreatment device, and a monitoring device. The rainwater collecting device comprises a water inlet tank, an overflow tank, a shell, a rainwater collecting box and a water outlet pipe; the pretreatment device comprises a porous plate and a viscous soil seepage box; the monitoring device comprises a flowmeter, a monitoring bottle, an electrode and a multi-parameter instrument connected with the electrode through a wire; the water inlet tank is connected with the left upper part of the shell through the water inlet pipe, the overflow tank is connected with the right upper part of the shell through the water outlet pipe, the shell is arranged at the upper end of the rain collecting box, three layers of viscous soil seepage boxes are arranged in the shell, and the porous plate is arranged above the viscous soil seepage boxes; the lower end of the rain collecting box is connected with a water guide pipe; a monitoring device is arranged at the outlet of the rain collecting box; the rainwater collecting module main body is manufactured by an acrylic plate with good water resistance and durability; the bottom of the drawable clay box is provided with a hole and a filter membrane, so that an effective drainage function can be realized; the monitoring device can monitor rainfall intensity, temperature, PH, dissolved oxygen and other parameters in real time.

3. The test device for simulating water rock action according to claim 1, wherein the water rock action module comprises an air entrainment device, a water rock action device, and a sampling monitoring device. The air-entraining device comprises an organic acid adding port, a carbon dioxide gas cylinder, a pressure pump and an air inlet pipe; the water rock action device comprises a carbonate rock module, a silicate rock module, an evaporation rock module and a seepage groove; the sampling monitoring device comprises a conductivity sensor, a water sampling valve and a sampling tube; the push-pull top cover is arranged on the organic acid adding port, and is made of glass fiber reinforced plastic materials, so that reagents can be added at any time; the organic acid adding port is connected with a water guide pipe, the carbon dioxide gas cylinder is connected with a pressure pump, the pressure pump is connected with the water guide pipe, and the water guide pipe is sequentially connected with a carbonate rock module, a silicate rock module, an evaporite module and a sampling pipe; the carbonate rock module is connected with the silicate rock module through a hard drain pipe; the silicate rock module is connected with the evaporation rock module through a glass fiber reinforced plastic drain pipe, and the seepage groove is filled with soil and sand; the conductivity sensor is used for monitoring the ion concentration in water in each place in real time.

4. A test method for a test device for simulating the action of water rock, characterized in that the test method employs a test device for simulating the action of water rock as claimed in any one of claims 1 to 3, comprising: the water inlet tank is connected with the left upper part of the shell through the water inlet pipe, the overflow tank is connected with the right upper part of the shell through the water outlet pipe, the shell is arranged at the upper end of the rain collecting box, three layers of viscous soil seepage boxes are arranged in the shell, and the porous plate is arranged above the viscous soil seepage boxes; the lower end of the rain collecting box is connected with a water guide pipe; a monitoring device is arranged at the outlet of the rain collecting box; the organic acid adding port is connected with the water guide pipe; the carbon dioxide gas cylinder is connected with the pressure pump, and the pressure pump is connected with the water guide pipe; the water guide pipe is sequentially connected with the carbonate rock module, the silicate rock module, the evaporation rock module and the sampling pipe; all valves are closed, all sensors are connected, organic acid is added into an organic acid adding port, a carbon dioxide gas cylinder valve and a pressure pump are opened, and water is added into a water inlet tank to a preset height; after water uniformly flows out of the sampling tube at the tail end of the drain pipe, opening each water taking valve for sampling; and finally, finishing sensor data and ion component data in the water sample for analyzing the action mechanism of the water rock.