CN113051644B - Hydropower station diversion inclined shaft excavation diameter determining method suitable for TBM construction - Google Patents
Hydropower station diversion inclined shaft excavation diameter determining method suitable for TBM construction Download PDFInfo
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Abstract
The invention discloses a method for determining the excavation diameter of a water diversion inclined shaft of a hydropower station, which is suitable for TBM construction, wherein the diameter of a flow cross section is determined according to the economic flow velocity and rated water head of the water diversion inclined shaft of the TBM construction, then the excavation diameters of the water diversion inclined shafts of water pumping and storage power stations with different rated water heads are determined according to the diameters of the flow cross sections, finally the excavation diameters of the water diversion inclined shafts of the water pumping and storage power stations with the rated water head of more than 400m are summarized and determined to be 7.0-7.4 m, so that the excavation diameters of the water diversion inclined shafts of the water pumping and storage power stations with the rated water head of more than 400m are the same as much as possible, the excavation diameters are properly changed within a reasonable rated water head loss range, the same TBM equipment is suitable for the excavation of the water diversion inclined shafts of the water pumping and storage power stations with different rated water heads, the TBM construction cost is shared, the TBM construction cost is reduced, and meanwhile the requirements of different rated water head sets on the design performance are met.
Description
Technical Field
The invention belongs to the technical field of hydropower engineering, and particularly relates to a method for determining the excavation diameter of a diversion inclined shaft of a hydropower station suitable for TBM construction.
Background
At present, the diversion tunnel of the water delivery system of the high-water-head power station for domestic construction generally selects a multi-stage inclined shaft or a vertical shaft arrangement scheme, the diversion tunnel adopting the inclined shaft arrangement mode is the diversion inclined shaft, and the diversion inclined shaft is an important building in the hydropower station and is characterized by steep inclination angle, large diameter and long length, so that the construction difficulty is large. At present, the general design parameters of the domestic diversion inclined shaft are as follows: the inclination angle is 45-60 degrees, the excavation diameter is 6-10 m, and the maximum construction length is controlled to be about 400m due to the limitation of construction capacity. In recent years, as the construction of the domestic pumped storage power station is carried out in succession, the construction technology of the diversion inclined shaft is greatly improved, the length of the inclined shaft guide shaft is more than 400m (Baoquan 419m, dunalization 424 m) by adopting a climbing tank, and the length of the inclined shaft guide shaft is more than 300m (Hui-hold 310m, barren trench 360 m) by adopting a back-up drilling machine.
At present, the excavation construction of domestic diversion inclined shaft adopts a drilling and blasting method, and the main defects are as follows: the construction guiding and the hole forming type are not easy to control; the flatness of the excavated holes is poor, and the problems of overexcavation and underexcavation are common; the construction speed is low; poor safety, etc.
The method is limited by the current construction technical level, and the water diversion tunnel of the water delivery system of the high-water head power station of the current domestic construction is generally selected to be a multi-stage inclined shaft or vertical shaft arrangement scheme, so that the vertical face arrangement design of the pumped storage power station is limited to a great extent. The diversion tunnel of the water delivery system adopts a multi-stage inclined shaft or vertical shaft arrangement structure, so that the length of the diversion system is longer, the adjustment and design performance is poorer, and in order to cancel the diversion surge chamber, the position of the factory building is relatively forward, thereby being unfavorable for reducing the length of the auxiliary chamber and the exploration flat hole of the factory building. In addition, due to construction limitation of a reverse well drilling or tank climbing method, when the inclined well is longer, a middle flat section or a middle flat hole construction support hole has to be additionally arranged, so that engineering investment is increased, construction period is prolonged, and complexity of engineering construction layout design is increased.
The TBM construction technology is used as a mechanical intelligent construction technology means, so that the arrangement of a diversion system can be optimized, the length of the diversion system is shortened, and the civil engineering quantity of the engineering is reduced; in the plant development mode comparison and selection process of the hydropower station feasibility research design stage, if the diversion inclined shaft is considered to be constructed by adopting a TBM technology, the plant position can be properly moved downstream, the length of an auxiliary chamber of the hydropower station plant can be shortened, and the engineering investment of an auxiliary chamber of the plant can be reduced; meanwhile, the closer the factory building is to the downstream side, the more beneficial to shortening the exploration flat hole of the factory building and shortening the geological exploration working period; the diversion system adopts TBM construction technology, so that the water flow inertia time constant (Tw) of the hydropower station water delivery system can be shortened, and the adjustment and design performance of the hydropower station can be improved.
However, rated heads of different pumped storage power stations are different, corresponding inclined shafts are different in excavation diameter, in general, the length of a single water diversion inclined shaft is not more than 1000m, the excavation diameter of the water diversion inclined shaft of the pumped storage power station with different heads is changed between 6.5m and 9.5m, the cost of TBM equipment is higher, the capacity of improving the excavation diameter of the equipment is poor, the excavation length of the TBM equipment is generally more than 8000m under the economic life, in order to reduce the use cost of the TBM equipment, the applicability of the TBM equipment is improved, the same TBM equipment is required to be applied to a plurality of different pumped storage power stations as much as possible, the use cost of the TBM equipment is required to be shared on the different pumped storage power stations, and therefore, the excavation diameter of the water diversion inclined shaft of the pumped storage power station with different heads is required to be designed in a standardized mode, and the popularization and application of the TBM equipment are facilitated.
Disclosure of Invention
The invention aims to provide a method for determining the excavation diameter of a diversion inclined shaft of a hydropower station, which is suitable for TBM construction, so as to solve the problems of poor economy and popularization of TBM excavation adopted by the diversion inclined shaft of a single pumped storage power station.
The invention solves the technical problems by the following technical scheme: a method for determining the excavation diameter of a diversion inclined shaft of a hydropower station suitable for TBM construction comprises the following steps:
step 1: acquiring the installed capacity, rated water head, rated flow of the pumped storage power station with different rated water heads, the economic flow rate of the diversion inclined shaft and the change rule of the economic flow rate;
step 2: analyzing and summarizing the installed capacity, the rated water head and the rated flow to obtain the installed capacity and the water supply mode applicable to the pumped storage power stations with different rated water heads; determining inclined shaft diversion flow of the water-pumped storage power stations with different rated heads according to the applicable installed capacity and water supply modes of the water-pumped storage power stations with different rated heads;
determining the economic flow rate of the diversion inclined shaft constructed by adopting TBM in the pumping energy storage power stations with different rated heads according to the economic flow rate of the diversion inclined shaft and the change rule thereof;
step 3: determining the diameter of the flow section of the diversion inclined shaft of the water-storage power station with different rated heads according to the economic flow rate of the diversion inclined shaft constructed by adopting the TBM and the diversion flow of the inclined shaft;
step 4: determining the excavation diameters of the diversion inclined shafts of the pumped storage power stations with different rated heads according to the diameter of the flow section and the construction requirements of lining after the diversion inclined shafts are excavated;
step 5: and analyzing and summarizing the excavation diameters of the diversion inclined shafts of the pumped storage power stations with different rated heads, and determining that the excavation diameter of the diversion inclined shaft of the pumped storage power station with the rated head above 400m is 7.0-7.4 m.
According to the invention, the economic flow rate of the diversion inclined shaft constructed by adopting the TBM is determined according to the economic flow rate of the diversion inclined shaft of the water-storage power station with different rated heads and the change rule thereof, the diameter of the overflow section is determined according to the economic flow rate of the diversion inclined shaft constructed by adopting the TBM and the rated heads, then the excavation diameter of the diversion inclined shaft of the water-storage power station with different rated heads is determined according to the diameter of the overflow section, finally the excavation diameter of the diversion inclined shaft of the water-storage power station with the rated heads above 400m is summarized and determined to be 7.0-7.4 m, so that the excavation diameter of the diversion inclined shaft of the water-storage power station with the rated heads above 400m is the same as much as possible, the excavation diameter is properly changed within a reasonable rated head loss range, the same TBM equipment is suitable for the excavation of the diversion inclined shafts of the water-storage power stations with different rated heads, the TBM construction cost is split, the TBM construction cost is reduced, and the requirement of the water-storage power station with different rated heads on the water-delivery power generation system is met.
Further, in the step 2, the economic flow rate of the diversion inclined shaft constructed by adopting the TBM is 5.0 m/s-7.0 m/s.
Considering that the investment of adopting TBM equipment to excavate the diversion inclined shaft is relatively larger than that of adopting a drilling and blasting method to construct the diversion inclined shaft, the economic flow rate can be properly improved, and the economic flow rate of adopting TBM to construct the diversion inclined shaft is set to be 5.0 m/s-7.0 m/s in combination with practical engineering experience.
In step 3, the diameter of the flow section of the water diversion inclined shaft of the water pumping and energy storage power station with different rated heads is equal to the water diversion flow rate of the inclined shaft/the corresponding economic flow rate of the water diversion inclined shaft adopting TBM construction.
Further, in the step 4, the excavation diameter of the diversion inclined shaft is 1.1-2.0 m larger than the diameter of the flow section.
Further, for the water diversion inclined shaft with the length smaller than 500m and the IV surrounding rock accounting for more than 10%, determining the excavation diameter of the water diversion inclined shaft according to the excavation size of the IV surrounding rock;
for the length of the diversion inclined shaft exceeding 500m, the surrounding rock of class IV accounting for less than 10 percent and the surrounding rock of class II and class III accounting for more than 90 percent, the excavation diameter of the diversion inclined shaft is determined according to the excavation size of the surrounding rock of class III.
Further, the excavation diameter of the starting chamber of the diversion inclined shaft constructed by adopting the TBM is 0.15-0.3 m larger than that of the diversion inclined shaft, so that TBM equipment can start.
Advantageous effects
Compared with the prior art, the method for determining the excavation diameter of the diversion inclined shaft of the hydropower station, which is suitable for TBM construction, is suitable for TBM construction technology, reduces the excavation cost of the diversion inclined shaft of the TBM equipment in a single pumped storage power station, improves the excavation applicability of the diversion inclined shaft of the TBM equipment in different pumped storage power stations, and is convenient for large-scale popularization of the diversion inclined shaft excavation of the TBM equipment in the pumped storage power station.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a hydropower station catchment inclined shaft arrangement in accordance with an embodiment of the invention;
FIG. 2 is a plan view of a hydropower station catchment inclined shaft arrangement structure in an embodiment of the invention;
FIG. 3 shows the fitting line of the diameter of the flow section of the inclined water diversion well under different economic flow rates and different rated water heads in the embodiment of the invention;
the device comprises a 1-diversion upper flat hole, a 2-first construction support hole, a 3-dismantling machine cavity, a 4-diversion inclined shaft, a 5-starting cavity, a 6-assembling cavity, a 7-second construction support hole, an 8-diversion lower flat hole, a 9-lower drainage gallery, a 10-upper drainage gallery and a 11-third construction support hole.
Detailed Description
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the description below are only one embodiment of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Taking the arrangement structure of the water diversion inclined shaft of the hydropower station shown in fig. 1 and 2 as an example to illustrate the method for determining the excavation diameter of the water diversion inclined shaft of the hydropower station, which is suitable for TBM construction, the arrangement structure of the water diversion inclined shaft of the hydropower station comprises two water diversion inclined shafts 4, wherein the top of each water diversion inclined shaft 4 is provided with a water diversion upper flat hole 1, and the bottom of each water diversion inclined shaft 4 is provided with a water diversion lower flat hole 8; for the diversion inclined shaft 4 for TBM construction by adopting a reverse well method, each diversion upper flat hole 1 is connected with the corresponding diversion inclined shaft 4 through a dismantling machine cavity 3, and each diversion lower flat hole 8 is connected with the corresponding diversion inclined shaft 4 through an assembling cavity 6 and an originating cavity 5 in sequence; a first construction branch hole 2 is arranged on each diversion upper flat hole 1, and a second construction branch hole 7 is arranged on each diversion lower flat hole 8; the first construction branch holes 2 corresponding to the two adjacent water diversion upper flat holes 1 are connected, the second construction branch holes 7 corresponding to the two adjacent water diversion lower flat holes 8 are connected, namely, the first construction branch holes 2 of one water diversion upper flat hole 1 are connected with the first construction branch holes 2 of the other water diversion upper flat hole 1, and the second construction branch holes 7 of one water diversion lower flat hole 8 are connected with the second construction branch holes 7 of the other water diversion lower flat hole 8.
The method for determining the excavation diameter of the diversion inclined shaft of the hydropower station suitable for TBM construction comprises the following steps:
step 1: and acquiring the installed capacity, rated water head, rated flow of the pumped storage power station with different rated water heads, the economic flow rate of the diversion inclined shaft 4 and the change rule of the economic flow rate.
And according to the built pumped storage power station, the corresponding installed capacity, rated water head, rated flow, economic flow rate of the diversion inclined shaft 4 and change rules of the economic flow rate can be obtained.
Step 2: analyzing and summarizing the installed capacity, the rated water head and the rated flow to obtain the installed capacity and the water supply mode applicable to the pumped storage power stations with different rated water heads; and determining the inclined shaft diversion flow of the water-pumped storage power stations with different rated heads according to the applicable installed capacity and the water supply mode of the water-pumped storage power stations with different rated heads.
Determining the economic flow rate of the diversion inclined shaft 4 constructed by adopting TBM in the pumping energy storage power stations with different rated heads according to the economic flow rate of the diversion inclined shaft 4 and the change rule thereof; considering that the investment of adopting TBM equipment to excavate the diversion inclined shaft is relatively larger than that of adopting a drilling and blasting method to construct the diversion inclined shaft, the economic flow rate can be properly improved, and the economic flow rate of adopting TBM to construct the diversion inclined shaft 4 is set to be 5.0 m/s-7.0 m/s in combination with practical engineering experience.
Step 3: and determining the diameter of the flow section of the water diversion inclined shaft 4 of the water pumping and energy storage power station with different rated heads according to the economic flow rate of the water diversion inclined shaft 4 constructed by adopting the TBM and the water diversion flow rate of the inclined shaft, wherein the diameter of the flow section of the water diversion inclined shaft 4 of the water pumping and energy storage power station with different rated heads is equal to the water diversion flow rate of the inclined shaft divided by the corresponding economic flow rate of the water diversion inclined shaft 4 constructed by adopting the TBM.
In the embodiment, the diameter of the flow section of the water diversion inclined shaft 4 of the water pumping and energy storage power station with different rated heads is equal to the water diversion flow rate of the inclined shaft/the corresponding economic flow rate of the water diversion inclined shaft 4 adopting TBM construction.
By counting the Tw values and the change rules of pressure pipelines of the pumped storage power stations with different rated heads, the higher the water head of the pumped storage power stations is, the smaller the running Tw value of the pressure pipelines is, and the pump storage power stations with the rated heads above 500m are combined with preliminary establishment of the economic flow rate of the TBM construction diversion inclined shaft, and the diameter of the diversion inclined shaft flow cross section constructed by adopting the TBM is about 5.5m; the pumped storage power station with the rated water head of 400-500 m can be combined with the power station regulation and guarantee design to design and optimize the water delivery system so as to meet the diameter requirement of the flow section of the diversion inclined shaft in TBM equipment construction. Tw is the water flow inertia time constant of the pressure pipe.
Step 4: and determining the excavation diameters of the diversion inclined shafts 4 of the pumped storage power stations with different rated heads according to the diameter of the flow section and the construction requirements of the lining after the excavation of the diversion inclined shafts 4.
Compared with the construction of a drilling and blasting method, the TBM construction method basically has no overbreak, and the excavation diameter of the diversion inclined shaft 4 is 1.1-2.0 m larger than the diameter of the flow section of the diversion inclined shaft 4 in order to facilitate the requirements of primary support and later permanent support of the diversion inclined shaft 4 lined by the later steel plate. For the length of the diversion inclined shaft 4 is less than 500m, the IV-class surrounding rock accounts for more than 10%, and the excavation diameter of the diversion inclined shaft 4 is determined according to the excavation size of the IV-class surrounding rock; for the diversion inclined shaft 4, the length exceeds 500m, the class IV surrounding rock accounts for less than 10 percent, the class II and class III surrounding rock accounts for more than 90 percent, and the excavation diameter of the diversion inclined shaft 4 is determined according to the excavation size of the class III surrounding rock. In this embodiment, the excavation diameter of the inclined water diversion well 4 is 1.6m larger than the flow section diameter of the inclined water diversion well 4. The flow section refers to the net section after lining excavation.
In this embodiment, the assembly chamber 6 and the disassembly chamber 3 are both in a city door shape, which is convenient for the assembly and disassembly of the TBM device. The originating chamber 5 adopts a horseshoe shape, and the side wall can provide counter force for the supporting shoe, thereby facilitating the originating. The excavation diameter of the originating chamber 5 is 0.15-0.3 m greater than the excavation diameter of the catchment inclined shaft 4, the gap facilitates the stepping of the TBM device, and the minimum value of the length of the originating chamber 5 should be greater than the host length of the TBM device. In this embodiment, the excavation diameter of the originating cavern 5 is 0.2m greater than the excavation diameter of the catchment inclined shaft 4.
Step 5: and analyzing and summarizing the excavation diameters of the diversion inclined shafts of the pumped storage power stations with different rated heads, and determining that the excavation diameter of the diversion inclined shaft of the pumped storage power station with the rated head above 400m is 7.0-7.4 m.
The flow section of the diversion inclined shaft 4 is determined according to the combination of the factors of the installed capacity, the rated water head, the rated flow and the like of the hydropower station, the diameter of a pipeline can be properly reduced within the range of reasonable water head loss, the construction cost of TBM is reduced, and meanwhile, the requirements of adjusting and guaranteeing the design performance of hydropower stations with different water head sections are met. And (3) according to the collection and arrangement of the power generation rated head, the installed capacity, the rated flow, the diversion inclined shaft diameter and the flow velocity of each hydropower station, carrying out statistical analysis, and preliminarily planning to obtain the economic flow velocity of the high-pressure pipeline diversion inclined shaft 4 under TBM construction. And calculating the design Tw values and the change rules of the high-pressure pipelines of different water head segments, and calculating the excavation diameters and lengths of the diversion inclined shafts 4 of the high-pressure pipelines of the hydropower stations of different water heads according to the planned economic flow rates of the high-pressure pipelines, as shown in Table 1.
TABLE 1 calculation table of excavation diameters of TBM construction inclined shafts with different water heads and different installed capacities
In order to improve the adaptability of TBM equipment, the cross section size of each inclined shaft of the hydropower station needs to be unified as much as possible. According to the principle of the economic flow rate of the pressure pipeline, the flow rate of the cross section of the TBM constructed inclined shaft is 7.0m/s in the embodiment, the design performance is guaranteed by combining the adjustment of a water power station, and the excavation diameter of the inclined shaft is found to be about 7.16m when the rated water head of the power station is 400 m. For the water pumping energy storage power station with the rated water head lower than 400m, the design of the water delivery system can be optimized by combining with the adjustment and guarantee design of the power station so as to meet the requirement of the excavation diameter applicability of TBM equipment. In addition, TBM equipment is through reforming transform, and the excavation diameter can be adjusted, and its popularization suitability is wider. In order to meet the construction requirements of the excavated back lining (concrete lining or steel plate lining) of the diversion inclined shaft 4 of different power stations and different geological conditions, the excavation diameter of the diversion inclined shaft 4 is 1.6m larger than the diameter of the flow section of the diversion inclined shaft 4.
As shown in fig. 1 and 2, for the ultra-long diversion inclined shaft 4 (diversion inclined shaft 4 with the diversion length of more than 500 m), in order to meet lining construction after TBM construction of the diversion inclined shaft 4, a lining construction working surface is added, a third construction branch hole 11 is arranged in the middle of each diversion inclined shaft 4, and the third construction branch holes 11 corresponding to two adjacent diversion inclined shafts 4 are connected. And a rock column is reserved between the third construction branch hole 11 and the corresponding diversion inclined shaft 4, the length of the rock column is not less than 1 time of the excavation diameter of the diversion inclined shaft 4, and the rock column ensures the safety of TBM equipment during tunneling construction. After TBM construction passes through the intersection of the diversion inclined shaft 4 and the third construction branch hole 11, the reserved rock pillar is blasted, and the blasting construction should consider the influence on the TBM construction diversion inclined shaft 4.
For the diversion inclined shaft 4 adopting the steel plate lining structure, an upper drainage gallery 10 of the pressure steel pipe is arranged at a position 40-60 m away from the steel lining starting point of the diversion inclined shaft 4, a lower drainage gallery 9 of the pressure steel pipe is arranged at the top of the diversion lower flat hole 8, and the external water pressure born by the pressure steel pipe is relieved by the upper drainage gallery 10 and the lower drainage gallery 9. An upper drainage gallery 10 is provided near the steel lining point of the inclined water diversion well 4, wherein the vicinity is 40 m-60 m away from the steel lining point of the inclined water diversion well 4, and the distance is calculated according to the water pressure in the inclined water diversion well 4 and the allowable hydraulic gradient of surrounding rock.
The upper drainage gallery 10 is constructed by the third construction branch hole 11. Considering that the TBM is constructed from bottom to top by adopting a reverse well method, the requirements of the diversion inclined well 4 on geological conditions are relatively high, and for a hydropower station with undefined geological conditions of the diversion inclined well 4, the construction of the TBM is suggested that the upper drainage gallery 10 is constructed before the construction of the diversion inclined well 4 so as to facilitate the exploration of geological conditions of the diversion inclined well 4 in advance. The upper drainage gallery 10 and the lower drainage gallery 9 can be constructed by adopting TBM (Tunnel boring machine) or drilling and blasting methods, and the section size is small.
Step 6: verification process
Step 6.1: the economic flow rate of the diversion inclined shafts of the pumping energy storage power stations with different rated water heads constructed by adopting TBM is V, V is more than or equal to 5.0m/s and less than or equal to 7.0m/s, the flow section diameters of the diversion inclined shafts corresponding to the different rated water heads are calculated when V=5.0 m/s, V=6.0 m/s and V=7.0 m/s respectively, and as shown in figure 3, the flow section diameters corresponding to V=5.0 m/s and 250/300/350/400/450/500/550/600/650/700 of the rated water heads, V=6.0 m/s and 250/300/350/400/450/500/550/600/650/700 of the rated water heads and V=7.0 m/s and 250/300/350/400/450/500/550/600/650/700 of the rated water heads are obtained respectively.
The diameter of the flow section is equal to the water diversion flow rate of the inclined shaft/the corresponding economic flow rate of the water diversion inclined shaft 4 constructed by adopting TBM.
Step 6.2: the flow cross section diameters of the diversion inclined shafts corresponding to different rated water heads (250/300/350/400/450/500/550/600/650/700) when V=5.0 m/s, V=6.0 m/s and V=7.0 m/s are respectively subjected to linear fitting to obtain linear fitting straight lines of the flow cross section diameters of the diversion inclined shafts when V is 5.0m/s, 6.0m/s and 7.0m/s, as shown by broken lines in fig. 3, a specific linear fitting formula is as follows:
wherein D is the diameter of the flow cross section, and H is the rated water head.
As can be seen from the figure 3, the excavation diameter of the pumped storage power station with the rated water head above 400m is basically not more than 7.4m, the excavation diameters of the inclined water wells of the pumped storage power stations with different rated water heads are summarized, and the pumped storage power stations with the rated water head above 400m are determined by combining the current development status of the pumped storage power stations in China (the rated water head of the subsequent pumped storage power station project to be built is more than 400 m) and the applicability of TBM equipment of the inclined water wells at home and abroad (the maximum excavation diameter is 6.6 m), and the excavation diameter of the inclined water wells with the rated water head above 400m is 7.0-7.4 m, preferably 7.2m; summarizing the values and the change rules of pressure pipelines Tw of pumped storage power stations with different rated heads, the higher the water head of the pumped storage power stations is, the smaller the operating Tw value of the pressure pipeline is, and if the TBM with the excavation diameter of 7.2m is still adopted for the pumped storage power stations with the rated head lower than 400m, the length of a diversion inclined shaft is shorter, the construction economy of the TBM is poor, and design optimization of a water delivery system is recommended to be carried out by combining with power station adjustment assurance design so as to meet the diameter requirement of the flow section of the diversion inclined shaft in TBM equipment construction.
The diversion inclined shaft 4 of the hydropower station is excavated by adopting a TBM construction method, so that the arrangement of a diversion system can be optimized, the length of the diversion system is shortened, and the civil engineering quantity of the engineering is reduced; in the plant development mode comparison and selection process of the hydropower station feasibility research design stage, if the diversion inclined shaft 4 is considered to be constructed by adopting a TBM technology, the plant position can be properly moved downstream, the length of an auxiliary chamber of the hydropower station plant can be shortened, and the engineering investment of an auxiliary chamber of the plant can be reduced; meanwhile, the closer the factory building is to the downstream side, the more beneficial to shortening the exploration flat hole of the factory building and shortening the geological exploration working period; the diversion system adopts a TBM construction technology, so that the water flow inertia time constant (Tw) of the hydropower station water delivery system can be shortened, and the adjustment and design performance of the hydropower station can be improved; the problems that the conventional drilling and blasting method for constructing the water diversion inclined shaft 4 is large in construction difficulty, slow in progress, limited in construction capacity, difficult in well guiding construction, difficult in control of a hole forming type, high in requirement on expanding and digging control blasting and high in safety risk can be solved.
Compared with the prior art, the method for determining the excavation diameter of the diversion inclined shaft of the hydropower station, which is suitable for TBM construction, is suitable for TBM construction technology, can reduce the excavation cost of the diversion inclined shaft of the TBM equipment in a single pumped storage power station, improves the excavation applicability of the diversion inclined shaft of the TBM equipment in different pumped storage power stations, and is convenient for large-scale popularization of the diversion inclined shaft excavation of the TBM equipment in the pumped storage power station.
The foregoing disclosure is merely illustrative of specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present invention.
Claims (6)
1. The method for determining the excavation diameter of the diversion inclined shaft of the hydropower station suitable for TBM construction is characterized by comprising the following steps of:
step 1: acquiring the installed capacity, rated water head, rated flow of the pumped storage power station with different rated water heads, the economic flow rate of the diversion inclined shaft and the change rule of the economic flow rate;
step 2: analyzing and summarizing the installed capacity, the rated water head and the rated flow to obtain the installed capacity and the water supply mode applicable to the pumped storage power stations with different rated water heads; determining inclined shaft diversion flow of the water-pumped storage power stations with different rated heads according to the applicable installed capacity and water supply modes of the water-pumped storage power stations with different rated heads;
determining the economic flow rate of the diversion inclined shaft constructed by adopting TBM in the pumping energy storage power stations with different rated heads according to the economic flow rate of the diversion inclined shaft and the change rule thereof;
step 3: determining the diameter of the flow section of the diversion inclined shaft of the water-storage power station with different rated heads according to the economic flow rate of the diversion inclined shaft constructed by adopting the TBM and the diversion flow of the inclined shaft;
step 4: determining the excavation diameters of the diversion inclined shafts of the pumped storage power stations with different rated heads according to the diameter of the flow section and the construction requirements of lining after the diversion inclined shafts are excavated;
step 5: and analyzing and summarizing the excavation diameters of the diversion inclined shafts of the pumped storage power stations with different rated heads, and determining that the excavation diameter of the diversion inclined shaft of the pumped storage power station with the rated head above 400m is 7.0-7.4 m.
2. The method for determining the excavation diameter of the diversion inclined shaft of the hydropower station suitable for TBM construction according to claim 1, wherein in the step 2, the economic flow rate of the diversion inclined shaft adopting TBM construction is 5.0 m/s-7.0 m/s.
3. The method for determining the excavation diameter of the diversion inclined shaft of the hydropower station suitable for TBM construction according to claim 1, wherein in the step 3, the diameter of the flow section of the diversion inclined shaft of the water-storage power station with different rated heads is equal to the diversion flow rate of the inclined shaft divided by the economic flow rate of the corresponding diversion inclined shaft adopting TBM construction.
4. The method for determining the excavation diameter of the inclined water diversion well of the hydropower station suitable for TBM construction according to any one of claims 1-3, wherein in the step 4, the excavation diameter of the inclined water diversion well is 1.1-2.0 m larger than the diameter of the flow cross section.
5. The method for determining the excavation diameter of the diversion inclined shaft of the hydropower station, which is suitable for TBM construction, is characterized in that the excavation diameter of the diversion inclined shaft is determined according to the excavation size of the IV surrounding rock, wherein the length of the diversion inclined shaft is less than 500m and the IV surrounding rock accounts for more than 10 percent;
for the length of the diversion inclined shaft exceeding 500m, the surrounding rock of class IV accounting for less than 10 percent and the surrounding rock of class II and class III accounting for more than 90 percent, the excavation diameter of the diversion inclined shaft is determined according to the excavation size of the surrounding rock of class III.
6. The method for determining the excavation diameter of the diversion inclined shaft of the hydropower station suitable for TBM construction according to claim 1, wherein the excavation diameter of an originating cavity of the diversion inclined shaft adopting TBM construction is 0.15-0.3 m larger than the excavation diameter of the diversion inclined shaft.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102787845A (en) * | 2012-07-19 | 2012-11-21 | 中铁十三局集团有限公司 | Segmented construction method of extra-long tunnels by adopting development machines to construct inclined shafts and headings first |
| KR101482883B1 (en) * | 2013-11-07 | 2015-01-14 | 현대건설주식회사 | Slurry Shield TBM Using Micro Air Bubble and the Tunnel Construction Method thereof |
| CN110195597A (en) * | 2019-06-14 | 2019-09-03 | 中国水利水电建设工程咨询西北有限公司 | A kind of water-storage chamber and construction method suitable for TBM construction |
| CN110607798A (en) * | 2019-10-10 | 2019-12-24 | 中国电建集团北京勘测设计研究院有限公司 | Underground factory building drainage corridor suitable for TMB construction |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102787845A (en) * | 2012-07-19 | 2012-11-21 | 中铁十三局集团有限公司 | Segmented construction method of extra-long tunnels by adopting development machines to construct inclined shafts and headings first |
| KR101482883B1 (en) * | 2013-11-07 | 2015-01-14 | 현대건설주식회사 | Slurry Shield TBM Using Micro Air Bubble and the Tunnel Construction Method thereof |
| CN110195597A (en) * | 2019-06-14 | 2019-09-03 | 中国水利水电建设工程咨询西北有限公司 | A kind of water-storage chamber and construction method suitable for TBM construction |
| CN110607798A (en) * | 2019-10-10 | 2019-12-24 | 中国电建集团北京勘测设计研究院有限公司 | Underground factory building drainage corridor suitable for TMB construction |
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