High earth and rockfill dam internal cable traction protection method

Abstract

The invention discloses a high earth and rockfill dam internal cable traction protection method, and relates to the technical field of earth and rockfill dam safety monitoring. Comprising the following steps that according to the structure of the high earth and rockfill dam, a cable penetrating area in the high earth and rockfill dam is divided into an upstream rock-fill area, an upstream transition layer inverted filter area, a gravelly soil core wall area, a downstream inverted filter area, a downstream transition layer rock-fill area and a shoreside concrete cover plate area; flexible cable protection pipes are arranged in the upstream rockfill area, the upstream transition layer inverted filter area, the downstream inverted filter area, the downstream transition layer rockfill area and the shoreside concrete cover plate area; a broken line type cable groove is formed in the gravelly soil core wall area; corresponding instrument cables are arranged in the cable penetrating areas in a penetrating mode. According to the method, the risk of concentrated traction damage of the cable is avoided, the influence on civil construction is relatively small, the situation that the instrument cable is damaged due to uneven settlement shearing dislocation of the cross-region part is avoided, and the adaptability and the survival rate of the monitoring instrument can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of earth-rock dam safety monitoring, and in particular to a cable traction protection method inside a high earth-rock dam. Background Art

[0002] In recent years, the domestic hydropower dam construction technology has developed rapidly. A number of typical earth-rock dam projects represented by hydropower stations such as Lianghekou (dam height 295m), Nuozadu (dam height 261.5m) and Changheba (dam height 240m) have gradually increased the height of gravel earth core wall rockfill dams from 100m to 300m, making the design theory and construction technology of earth-rock dams in my country reach the international advanced level. However, the development and application of earth-rock dam safety monitoring technology obviously lags behind the earth-rock dam construction technology. The adaptability of many monitoring instruments still remains at the 100m dam height level. Traditional instruments are still difficult to fully adapt to the safety monitoring requirements of 300m super-high earth-rock dams, resulting in a generally low survival rate of deformation monitoring instruments for high earth-rock dams.

[0003] Specifically, a high gravel-soil core dam is generally composed of upstream dry stone (or large stone) slope protection, upstream rockfill area, upstream transition layer, upstream filter layer, gravel-soil core wall, downstream filter layer, downstream transition layer, downstream rockfill area and dry stone (or mortar stone) slope protection. At present, the deformation monitoring means of high earth-rock dams generally adopts monitoring instruments such as beam-type settlement meters, string-type settlement meters, and large-range rod-type displacement meters. Among them, beam-type settlement meters and large-range rod-type displacement meters are generally arranged in vertical sections and elevations to meet the needs of large soil settlement deformation monitoring. Affected by the squeezing of the core wall soil and its own hanging weight, the cables are easily damaged by the squeezing of the soil, so that some monitoring instruments are damaged during the construction period. The seepage monitoring instruments of high earth-rock dams generally use osmometers, and the soil pressure monitoring generally uses soil pressure gauges. The cables of these monitoring instruments are also very easy to be broken and damaged by the dragging of large soil settlement deformation, resulting in instrument failure. In other words, monitoring instruments in high earth-rock dams generally face complex environmental conditions such as large deformation, high water pressure, and high earth pressure, which pose severe challenges to the adaptability and durability of the monitoring instruments.

[0004] The inventors have found that the survival rate of safety monitoring instruments in the built high core rockfill dams is generally not high. One of the important reasons is that the cables are damaged or destroyed due to large deformation and uneven settlement of high earth-rock dams. Therefore, as the weakest link in the earth-rock dam monitoring engineering system, the cable traction and protection methods of the monitoring instrument need to be further studied and tested to further improve the adaptability and survival rate of the monitoring instrument. Summary of the invention

[0005] In view of the technical problem of low survival rate of monitoring instruments in existing high earth-rock dams, the present invention provides a cable traction protection method inside a high earth-rock dam, which divides the cable installation area in the high earth-rock dam into an upstream rockfill area, an upstream transition layer filter layer area, a gravel core wall area, a downstream filter area, a downstream transition layer rockfill area and a shore concrete cover area according to the structure of the high earth-rock dam, and performs traction in different areas, thereby avoiding the risk of damage caused by concentrated cable traction, having relatively little impact on civil construction, and avoiding damage to instrument cables due to uneven settlement and shear dislocation in cross-area parts, thereby improving the adaptability and survival rate of monitoring instruments.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a method for protecting the internal cable of a high earth-rock dam, comprising the following steps:

[0008] According to the structure of the high earth-rock dam, the cable laying area in the high earth-rock dam is divided into the upstream rockfill area, the upstream transition layer filter layer area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area;

[0009] Flexible cable protection pipes are arranged in the upstream rockfill area, the upstream transition layer filter area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area, and a zigzag cable trench is arranged in the gravel core wall area;

[0010] Corresponding instrument cables are laid in the upstream rockfill area, the upstream transition layer filter area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area.

[0011] The cable traction protection method inside a high earth-rockfill dam provided by the present invention first divides the cable laying area in the high earth-rockfill dam into an upstream rockfill area, an upstream transition layer filter layer area, a gravel soil core wall area, a downstream filter area, a downstream transition layer rockfill area and a shore concrete cover plate area according to the structure of the high earth-rockfill dam; and flexible cable protective pipes are arranged in the upstream rockfill area, the upstream transition layer filter layer area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover plate area, and a zigzag cable groove is arranged in the gravel soil core wall area; then corresponding instrument cables are laid in the upstream rockfill area, the upstream transition layer filter layer area, the gravel soil core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover plate area, thereby avoiding the risk of cable damage due to concentrated traction, having relatively little impact on civil construction, and avoiding damage to instrument cables due to uneven settlement shear dislocation in cross-zone parts, thereby improving the adaptability and survival rate of monitoring instruments.

[0012] Specifically, the steps for laying the cable in the upstream rockfill area are:

[0013] Insert the instrument cable into the corresponding cable protection tube and pull it horizontally to the upstream dam slope;

[0014] The instrument cable that passes through the upstream dam slope is passed into the corresponding cable protective pipe along the upstream dam slope and pulled into the observation room on the dam top.

[0015] Specifically, the cable protective tube on the upstream dam slope is fixed on the upstream dam slope by means of buckles.

[0016] Specifically, the steps for laying the cable in the upstream transition layer filter layer area are:

[0017] Pull the instrument cable horizontally along the water flow direction to the upstream filter layer;

[0018] The instrument cable that passes through the upstream filter layer is pulled horizontally in the upstream filter layer along the cross-flow direction to the cable corridor beside the concrete cover plates on both sides;

[0019] The instrument cable pulled to the cable corridor will be pulled along the slope of the cable corridor to the observation room on the dam top.

[0020] Specifically, the steps for laying the cable in the gravel soil core wall area are:

[0021] Dig a zigzag cable trench along the core wall along the direction of water flow for the instrument cables inside the core wall;

[0022] Install a seepage-blocking ring bare wire outside the cable in the zigzag cable trench and pull it to the core wall axis in a "snake-like" manner;

[0023] Pull the instrument cable at the core wall axis vertically to the observation room on the dam top.

[0024] Specifically, the zigzag cable groove is an "N"-shaped groove.

[0025] Specifically, in the process of vertically pulling the instrument cable at the core wall axis to the dam top observation room, an EPE pearl cotton protective cover is passed through the outside of the instrument cable.

[0026] Specifically, the steps for laying the cable in the downstream anti-filtration area are:

[0027] Pull the instrument cable horizontally to the downstream filter layer of each monitoring section;

[0028] Lead the concentrated instrument cables vertically to the nearest strip elevation;

[0029] The vertical instrument cable is then pulled along the monitoring strip to the downstream dam slope observation room.

[0030] Specifically, the steps for laying the cable in the rockfill area of ​​the downstream transition layer are as follows:

[0031] Pull the instrument cables horizontally and concentrate them;

[0032] Lead the centralized instrument cable vertically to the nearest strip elevation;

[0033] The vertical instrument cable is then pulled along the monitoring strip to the downstream dam slope observation room.

[0034] Specifically, the steps for laying the cable in the shore concrete cover area are:

[0035] A cable corridor is pre-buried transversely in the concrete of the cover slab and is pulled to the downstream side of the cover slab;

[0036] Pull the instrument cable through the cable corridor and the corresponding cable protection pipe to the observation room on the dam top.

[0037] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0038] The cable traction protection method inside a high earth-rockfill dam provided by the present invention first divides the cable laying area in the high earth-rockfill dam into an upstream rockfill area, an upstream transition layer filter layer area, a gravel soil core wall area, a downstream filter area, a downstream transition layer rockfill area and a shore concrete cover plate area according to the structure of the high earth-rockfill dam; and flexible cable protective pipes are arranged in the upstream rockfill area, the upstream transition layer filter layer area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover plate area, and a zigzag cable groove is arranged in the gravel soil core wall area; then corresponding instrument cables are laid in the upstream rockfill area, the upstream transition layer filter layer area, the gravel soil core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover plate area, thereby avoiding the risk of cable damage due to concentrated traction, having relatively little impact on civil construction, and avoiding damage to instrument cables due to uneven settlement shear dislocation in cross-zone parts, thereby improving the adaptability and survival rate of monitoring instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] in:

[0041] Figure 1 A schematic flow chart of a method for protecting the internal cable of a high earth-rock dam provided by an embodiment of the present invention;

[0042] Figure 2 This is a longitudinal cross-sectional view (along the dam axis direction) of the cable traction of the high earth-rock dam according to an embodiment of the present invention;

[0043] Figure 3This is a cross-sectional view (monitoring section) of a cable traction of a high earth-rock dam according to an embodiment of the present invention;

[0044] Figure 4 This is a cable traction diagram for the shore concrete cover area according to an embodiment of the present invention.

[0045] It should be noted that:

[0046] exist Figure 2 In the figure, DC is an electromagnetic settlement ring, DW is a large-range displacement meter, HC is a beam-type settlement meter, VE is an active chamber inclinometer tube and electromagnetic settlement ring, TY is a soil displacement meter string, IN-R is a flexible inclinometer, PM is a dislocation meter, and E is an earth pressure meter;

[0047] exist Figure 3 Among them, DC is an electromagnetic settlement ring, HC is a beam-type settlement meter, VE is an activity chamber inclinometer tube and electromagnetic settlement ring, CH is a water tube settlement meter and tension line displacement meter, P is a piezometer, and E is an earth pressure gauge;

[0048] exist Figure 4 In the figure, J is the joint meter and PM is the dislocation meter. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0050] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0051] It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not need to be adopted to implement the present invention. In other embodiments, in order to avoid confusing the present invention, known methods are not specifically described.

[0052] Example

[0053] Combination Figure 1 This embodiment provides a method for protecting the internal cable of a high earth-rock dam by pulling it, comprising the following steps:

[0054] According to the structure of the high earth-rock dam, the cable laying area in the high earth-rock dam is divided into the upstream rockfill area, the upstream transition layer filter layer area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area;

[0055] Flexible cable protection pipes are arranged in the upstream rockfill area, the upstream transition layer filter area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area, and a zigzag cable trench is arranged in the gravel core wall area;

[0056] Corresponding instrument cables are laid in the upstream rockfill area, the upstream transition layer filter area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area.

[0057] It can be understood that due to the complex internal environmental conditions of the high earth-rock dam, the present embodiment divides the cable installation area in the high earth-rock dam into the upstream rockfill area, the upstream transition layer filter layer area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area to achieve "nearby traction, zoned dispersed traction", avoiding the risk of damage due to concentrated cable traction, and the cable traction makes full use of the nearby good instrument protection facilities (materials), such as monitoring strips, etc. At the same time, the instrument cables in each zone are relatively independently pulled, which has relatively little impact on civil construction on the one hand, and reduces the risk of concentrated damage on the other hand.

[0058] At the same time, due to the different settlement characteristics of the soil in each zone of the high earth-rock dam, uneven settlement will occur, and large shear displacement will occur in the cross-zone due to uneven settlement, which will damage the instrument cable. However, this embodiment realizes "no cross-zone unless necessary", thereby reducing the risk of instrument cable damage.

[0059] For cable protection pipes, flexible PE pipes (polyethylene pipes) are usually used in the civil engineering field.

[0060] Combination Figure 2 and Figure 3 , specifically:

[0061] The steps for laying the cable in the upstream rockfill area are as follows:

[0062] Insert the instrument cable into the corresponding cable protection tube and pull it horizontally to the upstream dam slope;

[0063] The instrument cable that passes through the upstream dam slope is passed into the corresponding cable protective pipe along the upstream dam slope and pulled into the observation room on the dam top.

[0064] In other words, when laying cables in the upstream rockfill area, first pass them through the PE flexible pipe and pull them horizontally to the upstream dam slope, then pass them through the PE pipe along the upstream dam slope and pull them to the observation room on the dam top, and the cable protective pipe on the upstream dam slope is fixed to the upstream dam slope by buckles.

[0065] The steps of laying the cable in the upstream transition layer filter layer area are as follows:

[0066] Pull the instrument cable horizontally along the water flow direction to the upstream filter layer;

[0067] The instrument cable that passes through the upstream filter layer is pulled horizontally in the upstream filter layer along the cross-flow direction to the cable corridor beside the concrete cover plates on both sides;

[0068] The instrument cable pulled to the cable corridor will be pulled along the slope of the cable corridor to the observation room on the dam top.

[0069] That is, the instrument cables in the upstream transition layer and upstream filter layer of each monitoring section are first pulled horizontally to the upstream filter layer along the direction of the water flow, then pulled horizontally in the upstream filter layer across the water flow to the cable corridor next to the concrete cover plates on both sides, and then pulled along the slope along the cable corridor to the dam top observation room.

[0070] Among them, the cable is protected by PE pipe when it is pulled horizontally in the transition layer and the filter layer, and a margin is reserved at the turning point. And the cable is protected by PE pipe in the cable channel.

[0071] It should be noted that in the existing technical solutions, the cables of the monitoring instruments in the upstream rockfill area and the upstream transition layer are mainly pulled vertically, and are pulled vertically along with the dam filling, so that the cables are affected by the dam filling and rolling construction for a long time, and the monitoring cables are difficult to protect and are easily damaged by the construction rolling interference. The cable pulling protection method inside the high earth-rock dam provided in this embodiment adopts the method of horizontal pulling through PE pipes to the upstream dam slope, which minimizes the impact of the dam rockfill construction on the cables.

[0072] The steps for laying the cable in the gravel soil core wall area are as follows:

[0073] Dig a zigzag cable trench along the core wall along the direction of water flow for the instrument cables inside the core wall;

[0074] Install a seepage-blocking ring bare wire outside the cable in the zigzag cable trench and pull it to the core wall axis in a "snake-like" manner;

[0075] Pull the instrument cable at the core wall axis vertically to the observation room on the dam top.

[0076] In this embodiment, the zigzag cable groove is an "N"-shaped groove.

[0077] Due to the large deformation and high earth pressure in high earth-rock dams, the tensile strength of cables is insufficient, and the cables are in direct contact with the soil. Large deformation and high earth pressure acting on the cables are likely to damage the cables. In this embodiment, when the instrument cable at the core wall axis is vertically pulled to the observation room at the dam top, an EPE pearl cotton protective sleeve is installed outside the instrument cable to avoid direct contact between the instrument cable and the soil.

[0078] This is equivalent to digging an N-shaped trench along the core wall in the direction of water flow before laying the instrument cable inside the core wall, and installing a seepage-blocking ring in the trench, pulling the bare wire in a "snake-like" manner to the core wall axis, and then vertically pulling it to the observation room on the dam top. During the vertical pulling, the cable is protected by EPE pearl cotton to avoid direct contact with the soil and reduce the impact of soil settlement and pulling.

[0079] It is understandable that, since the core wall is the most important anti-seepage body, it is generally not allowed to pass the cable in the core wall through the pipe and pull it along the direction of the water flow for protection, which makes it difficult to compact the outer periphery of the cable, and it is easy to form a seepage channel, affecting the anti-seepage effect of the dam. In addition, the existing technical solutions are all vertical bare wire traction, and the cable is pulled toward the dam top as the dam is filled. However, there are many instruments arranged in the core wall, so that many vertical cable protection areas are formed on the surface of the core wall of the dam. On the one hand, it affects the normal filling construction of the core wall, and on the other hand, it is easily damaged by the construction. In addition, it is also easy to be damaged by the pulling of soil settlement. The cable traction protection method inside the high earth-rock dam provided in this embodiment adopts the "N" groove serpentine laying concentration (the cable adds a seepage-proof ring), and the rear vertical traction adopts EPE pearl cotton protection. On the one hand, the seepage path along the length of the cable is extended, and the seepage-blocking ring is used to greatly reduce the occurrence of leakage channels along the length of the cable. On the other hand, the cables are relatively concentrated, which reduces the interference with the dam filling construction and minimizes the impact of construction machinery on the cables. In addition, the vertical traction wears EPE pearl cotton to avoid direct contact between the cable and the soil, so as to prevent soil settlement from pulling and damaging the cable.

[0080] The steps for laying the cable in the downstream anti-filtration area are as follows:

[0081] Pull the instrument cable horizontally to the downstream filter layer of each monitoring section;

[0082] Lead the concentrated instrument cables vertically to the nearest strip elevation;

[0083] The vertical instrument cable is further pulled along the monitoring strip to the downstream dam slope observation room, and the cable is protected by PE pipe throughout the pulling process.

[0084] It should be understood that in the existing technical solutions, the cables of the upstream and downstream filter layer monitoring instruments are mainly pulled vertically, which is more affected by the dam filling and rolling construction, and the cables are more susceptible to construction damage. The internal cable traction protection method of the high earth-rock dam provided in this embodiment takes into account the settlement characteristics of the filter layer (the settlement of the filter layer occurs quickly, and then the settlement slows down and stabilizes), and adopts traction along the filter layer to the left and right bank slopes, and then traction along the cable channel next to the bank slope cover. Thereby greatly reducing construction interference, and taking advantage of the fast settlement of the filter layer, it is beneficial to the cable traction protection in the filter layer, and centralized protection can be provided in the cable channel to prevent the rolling machinery and equipment from directly acting on the cable, greatly reducing the risk of cable damage.

[0085] The steps for laying the cable in the rockfill area of ​​the downstream transition layer are as follows:

[0086] Pull the instrument cables horizontally and concentrate them;

[0087] Lead the centralized instrument cable vertically to the nearest strip elevation;

[0088] The vertical instrument cable is then pulled along the monitoring strip to the downstream dam slope observation room.

[0089] For cables buried at greater depths, galvanized steel pipes can be placed inside PE pipes for protection due to the heavy pressure of the overlying rockfill.

[0090] It is known that in the existing technical solutions, the cables in the downstream transition layer and the downstream rockfill area are mainly pulled vertically, and there is also the problem of damage caused by construction rolling. This technical solution utilizes the monitoring strips (monitoring facilities) buried in the downstream transition layer and rockfill area of ​​the dam, and leads the monitoring instrument cables to the nearby monitoring strips according to the principle of nearby traction, and then leads them to the observation room behind the dam along the monitoring strips. The internal cable traction protection method of the high earth-rock dam provided in this embodiment fully utilizes the protective effect of the monitoring strips on the monitoring equipment and facilities, and realizes the protection of the instrument cables by the monitoring strips without increasing the amount of additional civil engineering, greatly reducing the interference of civil engineering construction and improving the survival rate of the monitoring instruments in this area.

[0091] Combination Figure 4 The cable laying steps in the shore concrete cover area are as follows:

[0092] A cable corridor is pre-buried transversely in the concrete of the cover slab and is pulled to the downstream side of the cover slab;

[0093] The instrument cable is pulled to the dam top observation room through the cable corridor and the corresponding cable protection pipe.

[0094] That is, when laying instrument cables through the concrete cover plates on both sides of a high earth-rock dam, they are first pre-embedded horizontally in the concrete of the cover plates and pulled to the cable corridor on the downstream side of the cover plates (the junction is protected by a PE pipe), and then pulled through the PE pipe to the observation room on the dam top.

[0095] It is understandable that the shear displacement between the core wall and the cover plates on both sides is large, which brings great challenges to the cable traction protection at this location. In the existing technical solution, the cable is pulled along the slope of the concrete cover plate surface through the PE pipe to the observation room on the top of the dam. However, due to the presence of cables at the joint, the joint between the cover plate and the concrete is not compacted, which easily forms a seepage channel and affects the anti-seepage effect of the core wall. In this embodiment, a cable channel is added on the upstream and downstream sides of the cover plate, and the channel is located in the upstream and downstream filter layer area. The instrument cable at the contact part between the cover plate and the core wall is first embedded in the cover plate concrete to the cable channel on the upstream and downstream sides, and then led to the dam top observation room through the PE pipe along the channel, which does not affect the rolling construction of the joint between the cover plate and the core wall, ensuring the anti-seepage effect of the core wall. At the same time, the cable in the upstream and downstream filter layers also reduces the impact of the huge shear displacement of the core wall on the cable.

[0096] In this embodiment, if the turning angle is greater than 10° during cable pulling, a telescopic joint (box) should be set at the turning point, and a 4m to 5m cable margin should be reserved in the telescopic joint. The reserved cables should be straightened and cannot be entangled with each other.

[0097] In summary, the cable traction protection method inside the high earth-rock dam provided in the present embodiment first divides the cable laying area in the high earth-rock dam into the upstream rockfill area, the upstream transition layer filter layer area, the gravel soil core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area according to the structure of the high earth-rock dam; and flexible cable protective pipes are arranged in the upstream rockfill area, the upstream transition layer filter layer area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area, and a zigzag cable trench is arranged in the gravel soil core wall area; then, corresponding instrument cables are laid in the upstream rockfill area, the upstream transition layer filter layer area, the gravel soil core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area, thereby avoiding the risk of concentrated cable traction damage, having relatively little impact on civil construction, and avoiding damage to instrument cables due to uneven settlement shear dislocation in cross-zone parts, thereby improving the adaptability and survival rate of monitoring instruments.

[0098] In addition, the internal cable traction protection method of a high earth-rock dam provided in this embodiment has been successfully applied in a domestic high earth-rock dam. The survival rate of the internal monitoring instruments of the dam has been increased to more than 96%. It has a high practical engineering application value and can be promoted and applied in similar projects.

[0099] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for protecting the internal cable of a high earth-rock dam, characterized in that: The following steps are involved: According to the structure of the high earth-rock dam, the cable laying area in the high earth-rock dam is divided into the upstream rockfill area, the upstream transition layer filter layer area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area; Flexible cable protection pipes are arranged in the upstream rockfill area, the upstream transition layer filter area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area, and a zigzag cable trench is arranged in the gravel core wall area; Corresponding instrument cables are laid in the upstream rockfill area, the upstream transition layer filter area, the gravel core wall area, the downstream filter area, the downstream transition layer rockfill area and the shore concrete cover area.

2. The cable traction protection method for a high earth-rock dam according to claim 1 is characterized in that: The steps for laying the cable in the upstream rockfill area are as follows: Insert the instrument cable into the corresponding cable protection tube and pull it horizontally to the upstream dam slope; The instrument cable that passes through the upstream dam slope is passed into the corresponding cable protective pipe along the upstream dam slope and pulled into the observation room on the dam top.

3. The cable traction protection method for a high earth-rock dam according to claim 2 is characterized in that: The cable protection pipe on the upstream dam slope is fixed on the upstream dam slope by means of buckles.

4. The cable traction protection method inside a high earth-rock dam according to claim 1 is characterized in that: The steps of laying the cable in the upstream transition layer filter layer area are as follows: Pull the instrument cable horizontally along the water flow direction to the upstream filter layer; The instrument cable that passes through the upstream filter layer is pulled horizontally in the upstream filter layer along the cross-flow direction to the cable corridor beside the concrete cover plates on both sides; The instrument cable pulled to the cable corridor will be pulled along the slope of the cable corridor to the observation room on the dam top.

5. The cable traction protection method inside a high earth-rock dam according to claim 1 is characterized in that: The steps for laying the cable in the gravel soil core wall area are as follows: Dig a zigzag cable trench along the core wall along the direction of water flow for the instrument cables inside the core wall; Install a seepage-blocking ring bare wire outside the cable in the zigzag cable trench and pull it to the core wall axis in a "snake-like" manner; Pull the instrument cable at the core wall axis vertically to the observation room on the dam top.

6. The cable traction protection method inside a high earth-rock dam according to claim 5 is characterized in that: The zigzag cable groove is an "N"-shaped groove.

7. The cable traction protection method inside a high earth-rock dam according to claim 5 is characterized in that: When the instrument cable at the core wall axis is vertically pulled into the dam top observation room, an EPE pearl cotton protective sleeve is passed through the outside of the instrument cable.

8. The cable traction protection method inside a high earth-rock dam according to claim 1 is characterized in that: The steps for laying the cable in the downstream anti-filtration area are as follows: Pull the instrument cable horizontally to the downstream filter layer of each monitoring section; Lead the concentrated instrument cables vertically to the nearest strip elevation; The vertical instrument cable is then pulled along the monitoring strip to the downstream dam slope observation room.

9. The cable traction protection method inside a high earth-rock dam according to claim 1, characterized in that: The steps for laying the cable in the rockfill area of ​​the downstream transition layer are as follows: Pull the instrument cables horizontally and concentrate them; Lead the centralized instrument cable vertically to the nearest strip elevation; The vertical instrument cable is then pulled along the monitoring strip to the downstream dam slope observation room.

10. The cable traction protection method inside a high earth-rock dam according to any one of claims 1 to 9, characterized in that: The steps for laying the cable in the shore concrete cover area are as follows: A cable corridor is pre-buried transversely in the concrete of the cover slab and is pulled to the downstream side of the cover slab; The instrument cable is pulled to the dam top observation room through the cable corridor and the corresponding cable protection pipe.

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