Slope stabilizing method based on electroosmosis

Abstract

The invention relates to the technical field of civil engineering, in particular to a slope stabilizing method based on electroosmosis, which comprises the following steps: arranging a plurality of layers of electrode devices, including shallow electrodes, middle electrodes and deep electrodes, in soil at different depths of a slope so as to meet the humidity regulation and control requirements of the soil at different depths; adding a bio-based stabilizer into the shallow soil; the current intensity of each layer of electrode is adjusted through an independent power supply control module, the current is dynamically adjusted according to the soil humidity, and the pulse frequency is automatically adjusted by using multi-frequency pulse current according to the soil humidity. Low-frequency pulses are used in the high-humidity area to accelerate moisture discharge, high-frequency pulses are used in the moderate-humidity area to keep humidity balance, and high-frequency low-intensity pulses are used in the low-humidity area to avoid further drying of soil.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and more particularly to a slope stabilization method based on electro-osmosis. Background Art

[0002] During the construction and long-term use of infrastructure such as roads, railways and urban slopes, the stability of the slope is easily affected by moisture, soil composition, climatic conditions and geological activities, resulting in landslides or soil loss, posing a major threat to the structures and the surrounding environment.

[0003] Although traditional slope reinforcement methods (such as plant slope protection and anchor support) can effectively reduce the risk of landslides under certain conditions, their effectiveness depends on natural conditions and construction conditions. Especially in areas with frequent precipitation or complex geological conditions, it is difficult to maintain stability in the long term and the maintenance cost is high.

[0004] Electro-osmosis slope protection technology is a new method used for soil reinforcement in recent years. By inserting electrodes into the soil and applying a DC electric field, the electro-osmosis effect is used to gradually migrate the moisture in the soil to a designated area or discharge it from the slope, thereby reducing the soil moisture content, enhancing the friction between soil particles, and increasing shear strength, thereby improving the stability of the slope.

[0005] The core of the electro-osmosis effect is the migration of water under the action of an electric field, that is, the water migrates from the anode area to the cathode area, reducing the pore water pressure, making the soil particles more compact and reducing the risk of landslides. This technology is particularly effective in clay and silt with high water content.

[0006] For example, the electro-osmosis ecological slope protection and maintenance method proposed in Patent No. CN111894014B monitors the humidity changes of the soil in real time through a humidity sensor, and can periodically adjust the intensity of the current, thus achieving a certain degree of humidity management and slope stability.

[0007] Regardless of the existing disclosed technology or the currently known construction methods, there is often a problem that the electro-osmosis system usually adopts a constant electrode arrangement and power supply method, which cannot flexibly respond to the moisture changes in soil layers at different depths, and it is difficult to achieve the ideal reinforcement effect under changing environmental conditions. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a slope stabilization method that can achieve precise management of soil moisture at different depths through multi-layer electrodes and multi-frequency pulse current control, so as to effectively enhance the structural stability of the slope.

[0009] To achieve the above object, the present invention provides the following technical solutions: A slope stabilization method based on electroosmosis comprises the following steps: S1. Arrange multi-layer electrode devices in the soil at different depths of the slope, including shallow, middle and deep electrodes, to meet the moisture control needs of the soil at different depths; S2. Add bio-based stabilizers to shallow soil. S3, each layer of electrodes adjusts the current intensity through an independent power control module, and dynamically adjusts the current according to the soil moisture to achieve moisture management of soil at different depths; S4. Use multi-frequency pulse current to automatically adjust the pulse frequency according to soil moisture. Apply low-frequency pulse current to areas with higher humidity to enhance moisture discharge, and apply high-frequency pulse current to areas with moderate humidity to maintain stable humidity.

[0010] The present invention is further configured as follows: in S1, a directional drainage channel is provided near the shallow electrode to guide excess water to drain to a preset drainage area.

[0011] The present invention is further configured as follows: the bio-based stabilizer comprises, by weight: 20-25 parts of chitosan, 10-15 parts of polylactic acid, 15-20 parts of calcium ions, 5-10 parts of bacillus, 15-20 parts of polyacrylamide hydrogel, and 5-10 parts of carbon black.

[0012] The present invention is further configured as follows: in S3, a humidity sensor is arranged near each layer of electrodes to monitor soil moisture in real time; the power control module is responsible for receiving the feedback signal of the humidity sensor and adjusting the corresponding current intensity; a humidity threshold is preset in the power control module; when the humidity exceeds a certain upper limit value, the power module will automatically increase the current intensity to discharge excess moisture; when the humidity is lower than the lower limit value, the current intensity is reduced to maintain a suitable humidity level of the soil.

[0013] The present invention is further configured as follows: the soil moisture in S4 is divided into: a high humidity area is higher than 20%, a moderate humidity area is between 10-20%, and a low humidity area is lower than 10%. If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 0.5-1 Hz; If the humidity is in the moderate area, the multi-frequency pulse current pulses 3-5 Hz; If the humidity is in a low humidity area, the multi-frequency pulse current pulses 8-10 Hz.

[0014] The present invention is further configured as follows: if the humidity is in a high humidity area, the current intensity is 20-30 A, and the duration / interval time is 2 seconds "on" and 1 second "off"; If the humidity is in the moderate area, the current intensity is 10-15 A, and the duration / interval is 1 second "on" and 1 second "off"; If the humidity is in a low humidity area, the current intensity is 5-10 A, and the duration / interval is 0.5 seconds "on" and 0.5 seconds "off".

[0015] The present invention is further configured such that: a metal coating is applied on the electrode output end of the electrode device extending into the soil.

[0016] Compared with the shortcomings of the prior art, the beneficial effects of the present invention are: Multi-layer electrodes are arranged in the soil at different depths, and the humidity differences among the shallow, middle and deep layers are independently regulated. The current intensity of each layer is adjusted through an independent power control module, thus achieving precise moisture management of multi-layer soil.

[0017] It adopts multi-frequency pulse current control, automatically switching the pulse frequency and current intensity according to the soil moisture status. Low-frequency pulses are used to accelerate water discharge in high-humidity areas, high-frequency pulses are used to maintain humidity balance in moderate humidity areas, and high-frequency and low-intensity pulses are used to prevent further drying of the soil in low-humidity areas. This mode significantly reduces power consumption and electrode corrosion rate, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0019] Reference Figure 1 Embodiments 1-3 of the present invention are further described.

[0020] This embodiment 1: Step 1: Arrange multi-layer electrode devices in the soil at different depths of the slope, including shallow, middle and deep electrodes, to meet the moisture control needs of soils at different depths. The electrode devices extend into the soil and the output ends of the electrodes are coated with metal coatings. Set up directional drainage channels near the shallow electrodes to guide excess water to the preset drainage area.

[0021] Step 2: Add a bio-based stabilizer to the shallow soil. The bio-based stabilizer includes, by weight: 20 parts of chitosan, 10 parts of polylactic acid, 15 parts of calcium ions, 5 parts of Bacillus, 15 parts of polyacrylamide hydrogel, and 5 parts of carbon black.

[0022] Step 3: Each layer of electrodes adjusts the current intensity through an independent power control module, and dynamically adjusts the current according to soil moisture to achieve moisture management of soil at different depths.

[0023] Step 4: According to soil moisture, soil moisture is divided into: above 20% is a high humidity area, 10-20% is a moderate area, and below 10% is a low humidity area. Use multi-frequency pulse current to automatically adjust the pulse frequency, apply low-frequency pulse current to areas with higher humidity to enhance moisture discharge, and apply high-frequency pulse current to areas with moderate humidity to keep the humidity stable.

[0024] Humidity sensors are arranged near each layer of electrodes to monitor soil moisture in real time. The power control module is responsible for receiving feedback signals from the humidity sensors and adjusting the corresponding current intensity. A humidity threshold is preset in the power control module. When the humidity exceeds a certain upper limit, the power module will automatically increase the current intensity to discharge excess moisture; when the humidity is lower than the lower limit, the current intensity is reduced to maintain a suitable humidity level of the soil.

[0025] If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 0.5 Hz, the current intensity is 20 A, and the duration / interval time is 2 seconds "on" and 1 second "off".

[0026] If the humidity is in the moderate area, the multi-frequency pulse current is pulsed at 3 Hz; the current intensity is 10 A, and the duration / interval is 1 second "on" and 1 second "off".

[0027] If the humidity is in a low humidity area, the multi-frequency pulse current has a pulse of 8 Hz, a current intensity of 5 A, and a duration / interval of 0.5 seconds "on" and 0.5 seconds "off".

[0028] Embodiment 2:

[0029] Step 1: Arrange multiple layers of electrode devices in the soil at different depths of the slope, including shallow, middle and deep electrodes. The electrode devices extend into the soil and the electrode output ends are coated with metal coatings. Set up directional drainage channels near the shallow electrodes to guide excess water to the preset drainage area.

[0030] Step 2: Add a bio-based stabilizer to the shallow soil. The bio-based stabilizer includes, by weight: 25 parts of chitosan, 15 parts of polylactic acid, 20 parts of calcium ions, 10 parts of Bacillus, 20 parts of polyacrylamide hydrogel, and 10 parts of carbon black.

[0031] Step 3: Each layer of electrodes adjusts the current intensity through an independent power control module, and dynamically adjusts the current according to soil moisture to achieve moisture management of soil at different depths.

[0032] Step 4: According to soil moisture, soil moisture is divided into: above 20% is a high humidity area, 10-20% is a moderate area, and below 10% is a low humidity area. If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 1 Hz, the current intensity is 30 A, and the duration / interval time is 2 seconds "on" and 1 second "off".

[0033] If the humidity is in the moderate area, the multi-frequency pulse current is pulsed at 5 Hz; the current intensity is 15 A, and the duration / interval is 1 second "on" and 1 second "off".

[0034] If the humidity is in a low humidity area, the multi-frequency pulse current has a pulse of 10 Hz, a current intensity of 10 A, and a duration / interval of 0.5 seconds "on" and 0.5 seconds "off".

[0035] Embodiment 3:

[0036] Step 1: Arrange multiple layers of electrode devices in the soil at different depths of the slope, including shallow, middle and deep electrodes. The electrode devices extend into the soil and the electrode output ends are coated with metal coatings. Set up directional drainage channels near the shallow electrodes to guide excess water to the preset drainage area.

[0037] Step 2: Add a bio-based stabilizer to the shallow soil. The bio-based stabilizer includes, by weight: 23 parts of chitosan, 12 parts of polylactic acid, 18 parts of calcium ions, 7 parts of Bacillus, 19 parts of polyacrylamide hydrogel, and 9 parts of carbon black.

[0038] Step 3: Each layer of electrodes adjusts the current intensity through an independent power control module, and dynamically adjusts the current according to soil moisture to achieve moisture management of soil at different depths.

[0039] Step 4: According to soil moisture, soil moisture is divided into: above 20% is a high humidity area, 10-20% is a moderate area, and below 10% is a low humidity area. If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 0.8Hz, the current intensity is 25A, and the duration / interval time is 2 seconds "on" and 1 second "off".

[0040] If the humidity is in the moderate area, the multi-frequency pulse current has a pulse of 4Hz; the current intensity is 14A, and the duration / interval is 1 second "on" and 1 second "off".

[0041] If the humidity is in a low humidity area, the multi-frequency pulse current has a pulse of 9Hz, a current intensity of 8A, and a duration / interval of 0.5 seconds "on" and 0.5 seconds "off".

[0042] Based on the steps of Example 2, the bio-based stabilizer and the current pulse and current intensity in each humidity zone were adjusted to obtain Comparative Example 1: The bio-based stabilizer includes, by weight: 18 parts of chitosan, 8 parts of polylactic acid, 13 parts of calcium ions, 4 parts of Bacillus, 13 parts of polyacrylamide hydrogel, and 4 parts of carbon black.

[0043] If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 0.8Hz, the current intensity is 25A, and the duration / interval time is 2 seconds "on" and 1 second "off".

[0044] If the humidity is in the moderate area, the multi-frequency pulse current has a pulse of 4Hz; the current intensity is 14A, and the duration / interval is 1 second "on" and 1 second "off".

[0045] If the humidity is in a low humidity area, the multi-frequency pulse current has a pulse of 9Hz, a current intensity of 8A, and a duration / interval of 0.5 seconds "on" and 0.5 seconds "off".

[0046] Based on the steps of Example 2, the bio-based stabilizer and the current pulse and current intensity in each humidity zone were adjusted to obtain Comparative Example 2: The bio-based stabilizer includes, by weight: 28 parts of chitosan, 17 parts of polylactic acid, 22 parts of calcium ions, 12 parts of bacillus, 22 parts of polyacrylamide hydrogel, and 12 parts of carbon black.

[0047] If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 0.8Hz, the current intensity is 25A, and the duration / interval time is 2 seconds "on" and 1 second "off".

[0048] If the humidity is in the moderate area, the multi-frequency pulse current has a pulse of 4Hz; the current intensity is 14A, and the duration / interval is 1 second "on" and 1 second "off".

[0049] If the humidity is in a low humidity area, the multi-frequency pulse current has a pulse of 9Hz, a current intensity of 8A, and a duration / interval of 0.5 seconds "on" and 0.5 seconds "off".

[0050] The following is a table of test data after running:

[0051] Analysis Soil moisture content: Examples 1, 2 and 3: The bio-based stabilizer effectively reduced the soil moisture content, especially in Example 3, where the soil moisture content dropped to 13.0% after the system was operated for 2 weeks, indicating the best moisture control effect.

[0052] Comparative Examples 1 and 2: The reduction in water content is limited. In Comparative Example 1, the excessive amount of bio-based stabilizer affects the drainage of the soil, causing the water content to drop to only 20.5%; in Comparative Example 2, the stabilizer content is insufficient, and the water content does not drop significantly, remaining at 20.0%.

[0053] Shear Strength: Examples 1, 2 and 3: The shear strength increases with the increase of the bio-based stabilizer content. The shear strength of Example 3 reaches 55.5 kPa after 2 weeks of operation, proving that the stabilizer significantly enhances the anti-slip property of the soil.

[0054] Comparative Examples 1 and 2: The shear strength is limited. The structure of Comparative Example 1 is unstable due to excessive stabilizer, and the shear strength is 36.0 kPa; the content of Comparative Example 2 is insufficient, the soil anti-slip effect is poor, and the shear strength is only 35.0 kPa.

[0055] Soil structure stability: Examples 1, 2 and 3: Aggregate formation and structural stability increase with increasing bio-based stabilizer content. Example 3 shows the best soil structural stability, with the most obvious aggregate formation, and the strongest anti-scouring and anti-slip capabilities.

[0056] Comparative Examples 1 and 2: Poor structural stability. In Comparative Example 1, due to the excessively high content of bio-based stabilizer, the aggregates were unevenly formed and the soil structure was loose; in Comparative Example 2, due to the insufficient content of stabilizer, the soil structure was loose and the anti-slip and anti-scouring capabilities were poor.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A slope stabilization method based on electroosmosis, characterized in that: The steps include: S1. Arrange multi-layer electrode devices in the soil at different depths of the slope, including shallow, middle and deep electrodes, to meet the moisture control needs of the soil at different depths; S2, adding bio-based stabilizers to shallow soil; S3, each layer of electrodes adjusts the current intensity through an independent power control module, and dynamically adjusts the current according to the soil moisture to achieve moisture management of soil at different depths; S4. Use multi-frequency pulse current to automatically adjust the pulse frequency according to soil moisture. Apply low-frequency pulse current to areas with higher humidity to enhance moisture discharge, and apply high-frequency pulse current to areas with moderate humidity to maintain stable humidity.

2. A slope stabilization method based on electroosmosis according to claim 1, characterized in that: In S1, a directional drainage channel is set near the shallow electrode to guide excess water to the preset drainage area.

3. A slope stabilization method based on electroosmosis according to claim 2, characterized in that: The bio-based stabilizer comprises, by weight: 20-25 parts of chitosan, 10-15 parts of polylactic acid, 15-20 parts of calcium ions, 5-10 parts of bacillus, 15-20 parts of polyacrylamide hydrogel, and 5-10 parts of carbon black.

4. The slope stabilization method based on electroosmosis according to claim 2, characterized in that: In the S3, humidity sensors are arranged near each layer of electrodes to monitor soil moisture in real time. The power control module is responsible for receiving feedback signals from the humidity sensors and adjusting the corresponding current intensity. A humidity threshold is preset in the power control module. When the humidity exceeds a certain upper limit, the power module will automatically increase the current intensity to discharge excess moisture; when the humidity is lower than the lower limit, the current intensity is reduced to maintain a suitable humidity level of the soil.

5. The slope stabilization method based on electroosmosis according to claim 4, characterized in that: The soil moisture in S4 is divided into: a high humidity area if it is higher than 20%, a moderate area if it is between 10% and 20%, and a low humidity area if it is lower than 10%. If the humidity is in a high humidity area, the pulse of the multi-frequency pulse current is 0.5-1 Hz; If the humidity is in the moderate area, the pulses of the multi-frequency pulse current are 3-5 Hz; If the humidity is in a low humidity area, the multi-frequency pulse current pulses 8-10 Hz.

6. The slope stabilization method based on electroosmosis according to claim 5, characterized in that: If the humidity is in a high humidity area, the current intensity is 20-30 A, and the duration / interval is 2 seconds "on" and 1 second "off"; If the humidity is in the moderate range, the current intensity is 10-15 A, and the duration / interval is 1 second "on" and 1 second "off"; If the humidity is in a low humidity area, the current intensity is 5-10 A, and the duration / interval is 0.5 seconds "on" and 0.5 seconds "off".

7. The slope stabilization method based on electroosmosis according to claim 5, characterized in that: The electrode device extends into the soil and a metal coating is applied on the electrode output end.

Images