A tunnel drilling and blasting method construction sewage discharge calculation method

Abstract

The application provides a tunnel drilling and blasting method construction sewage discharge calculation method, first calculates the whole tunnel normal water inflow Q', second, according to the surrounding rock grade, construction season, construction step distance, calculates the polluted underground water inflow Q1 and the sewage discharge Q2 caused by the construction technology in the tunnel construction process, finally obtains the single working face construction sewage discharge Q. The application ensures the preparation of relevant manpower and material resources before the construction, avoids the large deviation in the construction process, and causes the waste of resources. The method fills the vacancy of the specification, changes the problem of constantly replacing the water pump, water pipe and sewage treatment facilities in the tunnel construction process, so that the suitable construction machinery, supporting, materials and manpower can be accurately selected in the construction organization plan. The application fully considers the factors such as the tunnel construction season, construction machinery supporting, construction step distance and surrounding rock, which has an important role in reducing the construction energy consumption and avoiding the waste of resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel engineering construction, in particular to a tunnel drill-and-blast method construction sewage discharge calculation method. BACKGROUND

[0002] In recent decades, China's economy has developed rapidly, and the urbanization process has gradually accelerated. In order to reduce the traffic pressure brought by regional population growth, the development and use of underground space are in full swing, and the scale of tunnel construction is increasing year by year. However, with the continuous increase in the number and length of tunnels, tunnel construction sewage discharge is also increasing. In the actual construction process, tunnel construction groundwater discharge is either discharged without treatment, leading to serious environmental pollution, or is overdone, causing resource waste. Tunnels are concealed works, and there is no clear specification in the current highway industry on how to reasonably calculate tunnel sewage discharge to reasonably configure sewage discharge equipment. At present, construction units either do not treat and directly discharge, or the sewage treatment device is too large or too small, often causing continuous replacement of water pipes, water pumps, and sewage facilities, leading to environmental pollution or resource waste. Therefore, it is necessary to design a highway tunnel drill-and-blast method construction sewage discharge calculation method. SUMMARY

[0003] The purpose of the present application is to provide a tunnel drill-and-blast method construction sewage discharge calculation method to solve the technical problem of calculating the highway tunnel drill-and-blast method construction sewage discharge raised in the background.

[0004] To achieve the above purpose, the present application provides the following technical solutions:

[0005] A tunnel drill-and-blast method construction sewage discharge calculation method, the surrounding rock grade, construction season, and construction step distance of the tunnel construction site are obtained, the contaminated groundwater inflow Q1 that needs to be pumped and discharged and the sewage discharge Q2 caused by the construction process are calculated according to the surrounding rock grade, construction season, and construction step distance, and finally the single face construction sewage discharge Q of a single face is obtained. The calculation formula of the single face construction sewage discharge Q is as follows:

[0006] Q=K(Q1+Q2)

[0007] Where K is a safety correction factor.

[0008] Further, first, the total tunnel normal inflow Q' is determined, and then the contaminated groundwater inflow Q1 that needs to be pumped and discharged is calculated according to the surrounding rock grade, construction season, and construction step distance, and the calculation formula is as follows:

[0009]

[0010] Where: Q1 is the normal inflow of contaminated groundwater that needs to be pumped and discharged, m3 / h;

[0011] K1 is a seasonal correction coefficient, 1.5-2 in rainy season, and 1 in other seasons;

[0012] L1 is the distance from the hole to the secondary lining trolley, m;

[0013] L2 is the distance from the hole to the working face, m;

[0014] q1 is the water inflow per meter, m 3 / h;

[0015] l is the variable of the length of the tunnel, m;

[0016] Q' is the normal water inflow of the whole tunnel, m 3 / h;

[0017] L is the length of the whole tunnel, m;

[0018] When the construction is uphill, ΔL is the distance from the working face to the secondary lining trolley, m.

[0019] When the construction is downhill, ΔL is the distance from the working face to the hole, m.

[0020] Further, the sewage discharge Q2 caused by the construction process in the tunnel construction process is composed of three construction procedures, one is the sewage discharge of rock drilling machinery, the second is the sewage discharge of dust removal machinery, and the third is the sewage discharge of cleaning or wetting the working face. The calculation formula of the sewage discharge Q2 caused by the construction process is as follows:

[0021] Q2 = Q 21 + Q 22 + Q 23

[0022] Q 21 = α1N 21 q 21 = α1N 21 G 21 (1-β)

[0023] Q 22 = α2N 22 q 22 = G 22 (1-β)

[0024] Q 23 = Aq 23 (1-β)

[0025] Wherein: Q2 is the sewage discharge of the construction process, m 3 / h;

[0026] Q 21 is the sewage discharge of rock drilling machinery, m 3 / h;

[0027] Q 22 is the discharge volume of dust removal machinery, m 3 / h;

[0028] Q 23 Sewage volume for cleaning or wetting the working surface, m 3 / h;

[0029] α1 is the ratio of all rock drilling machines working at full load simultaneously:

[0030] When the excavation section is less than 50㎡, α1=1,

[0031] When 50㎡≤excavation section≤100㎡, α1=0.8,

[0032] When the excavation section is greater than 100 m2, α1 = 0.7;

[0033] N 21 is the number of rock drilling machines;

[0034] q 21 The sewage discharge of each rock drilling machine, m 3 / h;

[0035] G 21 is the water consumption of each rock drilling machine, m 3 / h;

[0036] β is the surrounding rock permeability;

[0037] α2 is the ratio of all dust removal machines working at full load at the same time, which is 0.75;

[0038] N 22 is the number of dust removal machines;

[0039] q 22 The amount of pollutants discharged by each dust removal machine, m 3 / h;

[0040] G 22 is the water consumption of each dust removal machine, m 3 / h;

[0041] A is the area to be cleaned or moistened, m2;

[0042] q 23 The amount of sewage discharged from the cleaning or wetting working surface per square meter per hour, m 3 / (㎡×h).

[0043] Furthermore, K is a safety correction factor. When groundwater is developed in the tunnel, K is 1.2 to 1.5; when groundwater is not developed in the tunnel, K is 1.05 to 1.1.

[0044] Furthermore, the normal water inflow Q' of the entire tunnel is calculated using the precipitation infiltration method and the groundrunoff modulus method. The larger value is selected from the calculation results of the precipitation infiltration method and the groundrunoff modulus method and multiplied by the safety factor to obtain the normal water inflow Q' of the entire tunnel to be built.

[0045] Furthermore, the normal water inflow Q' of the entire tunnel is calculated using the precipitation infiltration method. The calculation formula of the precipitation infiltration method is as follows:

[0046] Qs=2.74αWA

[0047] Where: Qs is the normal daily water inflow of the tunnel (m 3 / d); 2.74 is the conversion factor; α is the rainfall infiltration coefficient; W is the average annual precipitation (mm); A is the catchment area of ​​the water body through which the tunnel passes (km 2 ).

[0048] Furthermore, the normal water inflow Q' of the entire tunnel is calculated using the underground runoff modulus method. The calculation formula of the underground runoff modulus method is as follows:

[0049] Qs=86.4MA

[0050] Where: Qs is the normal daily water inflow of the tunnel (m 3 / d); 86.4 is the unit conversion coefficient; M is the groundwater runoff modulus (L / (s·km 2 ), A is the water-collecting area of ​​the water body through which the tunnel passes (km 2 ).

[0051] Furthermore, the pumping pipe diameter d is calculated based on the sewage discharge Q of a single tunnel face. The calculation formula is as follows:

[0052]

[0053] d—diameter of the water pump (m),

[0054] Q—Construction wastewater discharge volume (L / s),

[0055] v—Water flow velocity in the pipe network (m / s), 1.5m / s for temporary water use.

[0056] Furthermore, the calculation formula for the pump head is as follows:

[0057] H=Hi+h+V 2 / 2g

[0058] H—total head of the water pump,

[0059] Hi—net head of the pump,

[0060] h—loss head of pipeline,

[0061] V 2 / 2g - kinetic energy loss head at the pump outlet,

[0062] When selecting a water pump, the rated head of the water pump should be 1-1.1 times of the total head H.

[0063] A tunnel drilling and blasting construction sewage treatment method, according to the tunnel drilling and blasting construction sewage discharge calculation method, a single working face construction sewage discharge Q is obtained, according to the sewage discharge Q, a matching sewage treatment facility is selected, when the underground water is not corrosive, the underground water discharged to the central drainage pipe in the second paragraph is regarded as non-polluted underground water and can be directly discharged; when the underground water is corrosive, the polluted underground water needs to be discharged to the outside of the hole for sewage treatment.

[0064] The calculation method first calculates the normal water inflow of the whole tunnel, which is the basis for sewage discharge calculation, and it is one of the sewage sources. Secondly, according to the surrounding rock grade, construction season, construction step distance, the inflow of the underground water needing to be pumped and discharged due to pollution is calculated. The sewage excluded by the construction technology is also a source of sewage discharge. The polluted underground water and the sewage excluded by the construction technology are the working face construction sewage discharge. The pipe diameter of pumping is calculated according to the working face construction sewage discharge. The head is calculated according to the water quantity and the drainage elevation, and the water pump is selected. The sewage treatment supporting facilities are selected according to the total amount of sewage discharged outside the hole of each working face. The method provides an accurate sewage discharge calculation method, fills the gap of the highway tunnel specification, changes the problem of constantly replacing the water pump, water pipe and sewage treatment facility in the tunnel construction process, and enables the appropriate construction machinery, supporting materials and manpower to be accurately selected when the construction organization plan is made.

[0065] The present application has the following beneficial effects:

[0066] The highway tunnel drilling and blasting construction sewage discharge calculation method of the present application can be used to make construction organization design and prepare relevant manpower and material resources before construction, so as to avoid large deviation in the construction process and cause resource waste. The method fills the gap of the specification, changes the problem of constantly replacing the water pump, water pipe and sewage treatment facility in the tunnel construction process, and enables the appropriate construction machinery, supporting materials and manpower to be accurately selected when the construction organization plan is made. The present application fully considers the factors such as the season of tunnel construction, construction machinery supporting, construction step distance, surrounding rock and underground water when calculating the sewage discharge, accurately judges the tunnel sewage discharge, which plays a very important role in reducing the energy consumption and carbon consumption of tunnel construction and avoiding resource waste. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0068] Figure 1 This is a flow chart of a method for calculating sewage discharge volume according to an embodiment of the present invention; DETAILED DESCRIPTION

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0070] See Figure 1 As shown in the figure, a method for calculating the sewage discharge volume of tunnel construction using the drilling and blasting method is proposed. First, the normal water inflow Q' of the entire tunnel is calculated. Based on the geological characteristics of the tunnel site, the precipitation infiltration method and the groundwater runoff modulus method are used for calculation respectively. Through comprehensive comparison, the normal water inflow Q' of the entire tunnel to be built is predicted.

[0071] (1) Precipitation infiltration method

[0072] Qs=2.74αWA

[0073] Where: Qs is the normal daily water inflow of the tunnel (m 3 / d); 2.74 is the conversion factor; α is the rainfall infiltration coefficient; W is the average annual precipitation (mm); A is the catchment area of ​​the water body through which the tunnel passes (km 2 ).

[0074] (2) Underground runoff modulus method

[0075] When calculating the water inflow of a tunnel passing through multiple surface water basins, different groundwater runoff moduli and surface water basin ranges can be selected based on the outcrop location of each water-bearing rock formation, the landform, and the runoff conditions in the hydrogeological unit. The groundwater runoff modulus method can be used to predict the tunnel water inflow. The calculation formula is as follows:

[0076] Qs=86.4MA

[0077] Where: Qs is the normal daily water inflow of the tunnel (m 3 / d); 86.4 is the unit conversion coefficient; M is the groundwater runoff modulus (L / s·km 2 ), A is the water-collecting area of ​​the water body through which the tunnel passes (km 2).

[0078] According to the engineering geological and hydrogeological conditions of the tunnel site area of the proposed tunnel and the engineering experience of the built tunnel, the larger value of Qs calculated by the precipitation infiltration method and the underground runoff modulus method is selected, and based on the engineering safety consideration, a safety factor is multiplied to finally obtain the normal water inflow Q' of the proposed tunnel.

[0079] Secondly, the contaminated groundwater inflow Q1 that needs to be pumped and discharged is calculated according to the surrounding rock grade, construction season, and construction step distance. After obtaining the normal water inflow Q' of the whole tunnel, the water inflow of each specific stake number needs to be calculated. Different surrounding rock grades have different requirements for step distance. Under normal circumstances, the distance between the working face and the secondary lining of grade III surrounding rock should not be greater than 90 m, the distance between the working face and the secondary lining of grade IV surrounding rock should not be greater than 70 m, and the distance between the working face and the secondary lining of grade V surrounding rock should not be greater than 40 m. The distance between the working face and the secondary lining reflects the distance difference between the tunnel portal and the distance between the working face and the secondary lining trolley. The water inflow is not only related to the topography and geology, but also related to the season. Due to the reason of permeation, the groundwater is abundant in the rainy season and less in the winter. The tunnel water inflow is also related to the construction organization of the construction unit and the surrounding rock grade of the tunnel. The larger the step distance between the working face and the inverted arch and the inverted arch and the secondary lining, the more the exposed space and the water inflow. After the secondary lining is completed, if the groundwater is not corrosive, it does not need to be treated separately when the uphill construction is carried out because it is directly discharged to the outside of the hole from the central drainage ditch. However, the groundwater seepage between the working face and the secondary lining is contaminated and is considered as sewage. Therefore, the contaminated groundwater inflow Q1 that needs to be pumped and discharged is calculated according to the following formula:

[0080]

[0081] Wherein: Q1 is the normal water inflow of the contaminated groundwater that needs to be pumped and discharged, m 3 / h;

[0082] K1 is the seasonal correction coefficient, which is taken as 1.5-2 in the rainy season and 1 in other seasons;

[0083] L1 is the distance from the portal to the secondary lining trolley, m;

[0084] L2 is the distance from the portal to the working face, m;

[0085] q1 is the water inflow per meter, m 3 / h;

[0086] l is the variable of the length of the tunnel, m;

[0087] Q' is the normal water inflow of the whole tunnel, m 3 / h;

[0088] L is the length of the whole tunnel, m;

[0089] When uphill construction, ΔL is the distance between the working face and the two lining trolley;

[0090] When downhill construction, ΔL is the distance between the working face and the portal m;

[0091] Again, calculate the construction process sewage discharge Q2. Due to the dust, hole, and other construction during tunnel construction process, a certain amount of sewage, due to the permeability of surrounding rock, inconsistent construction time, resulting in water supply is not necessarily sewage discharge. Construction process sewage discharge is mainly composed of three construction process sewage, one is the drilling machinery sewage, two is the dust removal machinery sewage, three is the cleaning or wet working face sewage, these three parts constitute the overall construction process sewage Q2, its calculation formula is as follows:

[0092] Q2 = Q 21 + Q 22 + Q 23

[0093] Q 21 = α1N 21 q 21 = α1N 21 G 21 (1-β)

[0094] Q 22 = α2N 22 q 22 = G 22 (1-β)

[0095] Q 23 = Aq 23 (1-β)

[0096] Where: Q2 is the construction process sewage discharge, m 3 / h;

[0097] Q 21 is the drilling machinery sewage discharge, m 3 / h;

[0098] Q 22 is the dust removal machinery sewage discharge, m 3 / h;

[0099] Q 23 is the cleaning or wet working face sewage discharge, m 3 / h;

[0100] α1 is the ratio of all drilling machinery working full load at the same time:

[0101] When the excavation section <50㎡, α1 = 1,

[0102] When 50㎡ ≤ excavation section ≤ 100㎡, α1 = 0.8,

[0103] When the excavation section is >100 m2, α1=0.7;

[0104] N 21 is the number of rock drilling machines;

[0105] q 21 is the sewage discharge of each rock drilling machine, m 3 / h;

[0106] G 21 is the water consumption of each rock drilling machine, m 3 / h;

[0107] β is the permeability of surrounding rock;

[0108] α2 is the ratio of simultaneous full load of all dust removal machines, taken as 0.75;

[0109] N 22 is the number of dust removal machines;

[0110] q 22 is the sewage discharge of each dust removal machine, m 3 / h;

[0111] G 22 is the water consumption of each dust removal machine, m 3 / h;

[0112] A is the area that needs to be cleaned or moistened, m2;

[0113] q 23 is the sewage discharge of each square per hour of cleaning or moistening the working face, m 3 / (m2×h).

[0114] Finally, the sewage discharge Q of a single tunnel face is calculated. The sewage discharge Q of a single tunnel face is the sum of the contaminated groundwater inflow Q1 and the sewage discharge Q2 of the construction process. A certain safety factor is set considering the influence of the richness of groundwater. The calculation formula of the sewage discharge Q of a single tunnel face is as follows:

[0115] Q=K(Q1+Q2)

[0116] wherein K is a safety correction factor,

[0117] for a tunnel with developed groundwater, K is taken as 1.2-1.5,

[0118] for a tunnel without developed groundwater, K is taken as 1.05-1.1.

[0119] On the basis of the above calculation results, the pipe diameter d is calculated and a suitable water pump is selected.

[0120] The size of the water pumping pipe diameter d depends on the single face construction sewage discharge Q, and the calculation formula is as follows:

[0121]

[0122] d—diameter of the water pumping pipe (m),

[0123] Q—construction sewage discharge (L / s), at this time the calculation result of the single face construction sewage discharge Q of the previous step needs to be unit converted.

[0124] v—water flow velocity in the pipe network (m / s), temporarily 1.5 m / s.

[0125] The calculation of the water pump head uses the following formula:

[0126] H=Hi+h+V 2 / 2g

[0127] H—total head of a water pump,

[0128] Hi—net head of a water pump,

[0129] h—pipe loss head,

[0130] V 2 / 2g—kinetic energy loss head at the pump outlet.

[0131] When selecting a water pump, the rated head of the water pump is 1-1.1 times the total head H.

[0132] In addition, due to the requirements of environmental protection, the sewage generated during tunnel construction must be treated before being discharged. After the single face construction sewage discharge Q is determined, the matching sewage treatment facilities are selected according to the sewage discharge. When the underground water is not corrosive, the underground water that has been discharged to the central drainage pipe in the secondary paragraph can be regarded as non-polluted underground water and can be directly discharged; when the underground water is corrosive, it needs to be discharged together with the polluted underground water to the outside of the hole for sewage treatment.

[0133] The calculation method firstly calculates the normal water inflow of the whole tunnel, which is the basis of sewage discharge calculation, and is one of sewage sources. Secondly, according to the surrounding rock grade, construction season and construction step distance, the underground water inflow needing to be pumped and discharged due to pollution is calculated. The sewage discharged by the construction process is also a source of sewage discharge. The polluted underground water and the sewage discharged by the construction process are the sewage discharge of the working face construction. According to the sewage discharge of the working face construction, the pipe diameter of pumping is calculated. According to the water quantity and the drainage elevation, the lift is calculated, and the water pump is selected. According to the total amount of sewage discharged outside the hole of each working face, the sewage treatment supporting facilities are selected. The method provides an accurate sewage discharge calculation method, fills the gap of the highway tunnel specification, changes the problem of constantly replacing the water pump, water pipe and sewage treatment facilities in the tunnel construction process, and enables the appropriate construction machinery, supporting, materials and manpower to be accurately selected when the construction organization plan is made.

[0134] The highway tunnel drilling and blasting method construction sewage discharge calculation method of the present application can be used to make construction organization design and prepare relevant manpower and resources before construction, so as to avoid large deviation in the construction process and cause resource waste. The method fills the gap of the specification, changes the problem of constantly replacing the water pump, water pipe and sewage treatment facilities in the tunnel construction process, and enables the appropriate construction machinery, supporting, materials and manpower to be accurately selected when the construction organization plan is made. In the calculation of sewage discharge, the present application fully considers the factors such as tunnel construction season, construction machinery supporting, construction step distance, surrounding rock and underground water, accurately judges the tunnel sewage discharge, which plays a very important role in reducing tunnel construction energy consumption and carbon consumption, and avoids resource waste.

[0135] The method is not only suitable for highway tunnels, but also suitable for water conservancy, railway and other tunnels excavated by the drilling and blasting method. Since there are many tunnel construction processes, the present calculation method selects several main and important factors of sewage discharge for calculation, cannot cover all sewage discharge, but the method can meet the construction needs through coefficient correction.

[0136] The preferred embodiments disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application.

Claims

1. A method for calculating the sewage discharge amount in tunnel drilling and blasting construction, characterized in that, The tunnel construction site surrounding rock grade, construction season, construction step distance, according to the surrounding rock grade, construction season, construction step distance calculation of contaminated groundwater inflow Q1 and tunnel construction process caused by construction technology caused by pollution Q2, ultimately draw a single face construction sewage discharge Q, single face construction sewage discharge Q calculation formula as follows: Q=K(Q1+Q2) Wherein K is the safety correction factor; First determine the whole tunnel normal water inflow Q', secondly in combination with the surrounding rock grade, construction season, construction step distance calculation of contaminated groundwater inflow Q1, Q1 calculation formula as follows: Q1 = normal inflow of contaminated groundwater to be pumped, m3 / h 3 / h; K1 is the season correction factor, take 1.5-2 in rainy season, the rest of the season take 1; L1 is the distance from the hole to the second lining trolley, m; L2 is the distance from the hole to the face, m; q1 is the inflow per meter, m 3 / h; L is the length of the tunnel, m; Q' is the normal inflow of the full tunnel, m 3 / h; When uphill construction, ΔL is the distance from the face to the second lining trolley; When downhill construction, ΔL is the distance from the face to the hole, m; Tunnel construction process caused by construction technology caused by pollution Q2 by three construction process pollution, one is drilling mechanical pollution, two is dust removal mechanical pollution, three is cleaning or wet working face pollution, construction technology caused by pollution Q2 calculation formula as follows: Alpha 1 is the ratio of all drilling machinery working full load at the same time: Q2 = Q 21 +Q 22 +Q 23 Q 21 = a1N 21 q 21 = a1N 21 G 21 (1 - β) Q 22 = a2N 22 q 22 = G 22 (1 - β) Q 23 = Aq 23 (1 - β) wherein Q2 is the construction process pollution discharge amount, m 3 / h; Q 21 m for the rock drilling machine 3 / h; Q 22 m for dust removal of the dedusting machinery 3 / h; Q 23 To clean or wet the work surface, m 3 / h; Beta is the permeability of surrounding rock; When the excavation section < 50 m 3 α1 = 1, When 50m 3 ≤ excavation section ≤ 100m 3 then α1= 0.8, When the excavation section is > 100 m 3 α1= 0.7; N 21 The number of rock drilling machines q 21 m3 / h 3 m3 / h G 21 Water consumption for each drilling rig, m 3 / h; Alpha 2 is the ratio of all dust removal machinery working full load at the same time, take 0.75; K is the safety correction factor, in the case of tunnel groundwater development, K take 1.2-1.5; In the case of no groundwater development in tunnel, K take 1.05-1.

1. N 22 The number of dust removal machines; q 22 m 3 / h; G 22 m = water consumption per dust removal machine 3 / h; A is the area to be cleaned or wetted, m 2 ; q 23 Pollution load per square meter of working surface cleaned or wetted per hour, m 3 / (m 2 ×h); The whole tunnel normal water inflow Q' is calculated by precipitation infiltration method and groundwater runoff modulus method, select the larger value from the calculation results of precipitation infiltration method and groundwater runoff modulus method, and then multiply by the safety factor to obtain the normal water inflow Q' of the proposed tunnel.

2. The tunnel drilling and blasting method construction sewage discharge calculation method according to claim 1, characterized in that, The whole tunnel normal water inflow Q' is calculated by precipitation infiltration method, and the calculation formula of precipitation infiltration method is as follows:

3. The tunnel drilling and blasting method construction sewage discharge calculation method according to claim 2, characterized in that, Qs=2.74 alpha WA The whole tunnel normal water inflow Q' is calculated by groundwater runoff modulus method, and the calculation formula of groundwater runoff modulus method is as follows: In the formula: Qs is the normal tunnel daily inflow m 3 / d; 2.74 is a conversion factor; a is the rainfall infiltration coefficient; W is the annual average precipitation, mm, and A is the catchment area of the tunnel section passing through the water-bearing body, km 2 .

4. The tunnel drilling and blasting method construction sewage discharge calculation method according to claim 2, characterized in that, Qs=86.4 MA According to the single face construction sewage discharge Q, the pumping pipe diameter d is calculated, and the calculation formula is as follows: In the formula: Qs is the normal tunnel daily inflow m 3 / d; 86.4 is a unit conversion factor; M is the groundwater runoff modulus L / (s-km 2 ), A is the catchment area of the tunnel passing through the water-bearing section km 2 .

5. The tunnel drilling and blasting method construction sewage discharge calculation method according to claim 3 or 4, characterized in that, D - pumping pipe diameter, m, Q - construction sewage discharge, L / s, V - water flow velocity in pipe network, m / s, temporary water flow velocity is 1.5 m / s. The calculation formula of water pump lift is as follows:

6. The tunnel drilling and blasting method construction sewage discharge calculation method according to claim 5, characterized in that, H - total lift of water pump, H = H1+ h + V 2 / 2g Hi - net lift of water pump, H - pipe loss lift, When selecting water pump, the rated lift of water pump should be 1-1.1 times of the total lift H. V 2 / 2g - kinetic energy loss head at the pump water outlet, According to any one of claims 1-6, a tunnel drilling and blasting method construction sewage discharge calculation method is provided, the single face construction sewage discharge Q is obtained, according to the sewage discharge Q, the matching sewage treatment facility is selected, when the groundwater has no corrosiveness, the groundwater discharged to the central drainage pipe in the second paragraph is regarded as the groundwater without pollution, which can be directly discharged; When the groundwater has corrosiveness, it needs to be discharged with the contaminated groundwater to the outside of the hole for sewage treatment.

7. A tunnel drilling and blasting method sewage treatment method characterized by, ​

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