29 results about "Adit" patented technology

The application discloses a kind of based on virtual flat adit's slope structural plane model construction method, comprising: generating and each reality flat adit corresponding considering structural plane spatial variability reality flat adit model;Comprehensively consider the geometric characteristics of reality flat adit model and the certainty structural plane feature, generate several considering structural plane spatial variability while considering structural plane along elevation continuity random change virtual flat adit model.The application according to the actual flat adit data of site to the blank area that has not carried out flat adit exploration restores its structural plane feature as far as possible, establishes the structural plane network model in conformity with geological authenticity, to carry out subsequent slope stability evaluation work.The application realizes that the structural plane network constructed in model meets the exposure condition of reality flat adit, while considering the spatial variability of structural plane distribution characteristics in different parts of slope, solves the problem that structural plane model deviates from reality in rock slope numerical calculation and influences the slope stability evaluation.

The invention discloses a novel excavation type fan foundation and a construction method thereof, and belongs to the technical field of land wind power generation engineering, the novel excavation type fan foundation comprises a cylindrical main body foundation pit located underground and a plurality of footrills which are excavated from the side wall of the cylindrical main body foundation pit in the radial direction, and concrete is integrally poured in the foundation pit and the footrills to form an integrated fan foundation structure. During construction, firstly, the cylindrical main body foundation pit is vertically excavated downwards to the designed depth, then a footrill is tunneled on the side wall of the cylindrical main body foundation pit and is supported, then steel bars are bound, and concrete is integrally poured. According to the method, traditional large-area open excavation is changed into an innovative structure of combining the vertical foundation pit with the radial footrill, the earth excavation engineering amount and the land occupied area are remarkably reduced, damage to the environment is reduced, meanwhile, the construction cost is saved, the construction period is shortened, and comprehensive benefits are remarkable.

The method for treating mine wastewater in a roadway by using a multi-stage heavy metal control barrier comprises the following steps: intercepting the outflow of a main stream of mine wastewater in a flat adit mining roadway, so as to raise the liquid level of the mine wastewater and keep the exposed ore-bearing rock stratum and surrounding rock surface below the liquid level of the mine wastewater in an anaerobic state; filling composite organic material filling bodies and composite acid buffer material filling bodies in the roadway in sequence and at intervals, so as to react with the mine wastewater respectively; and sealing the filled roadway, so that the composite organic material filling bodies and the composite acid buffer material filling bodies are completely immersed in the mine wastewater and fully react with the mine wastewater. The method directly controls the mine wastewater generated by the exposed ore-bearing rock stratum and surrounding rock in the flat adit mining roadway, fully utilizes the underground space of a mine, constructs a reaction system in the roadway, realizes in-situ inhibition of the release of heavy metal pollutants, and blocks the migration of heavy metals. The process flow is simple and the operation cost is low.

The utility model discloses a pressure tunnel access door dredging device which comprises a pressure tunnel and a construction adit, an access door is arranged at an outlet of the construction adit, a water pump is fixedly arranged at the end, close to the construction adit, of the access door, and the output end of the water pump is connected with a water conveying channel connected with the interior of the access door. The end, away from the water pump, of the water conveying channel communicates with a water storage plate, a plurality of first water spraying pipes are evenly arranged at the bottom end of the water storage plate at intervals, a sand accumulation pool is arranged at the position, below the access door, in the pressure tunnel, a stainless steel frame is arranged at the upper end of the sand accumulation pool, and second water spraying pipes are fixedly arranged on the first water spraying pipes. Flushing water is pumped into the first water spraying pipe and the second water spraying pipe through the water pump, one end face of the sand accumulation pool is flushed through the first water spraying pipe, the other end face of the sand accumulation pool is flushed through the second water spraying pipe, and therefore silt in the sand accumulation pool can be cleaned conveniently.

The invention provides a plugging structure of a hydraulic tunnel construction adit and a construction method. The plugging structure comprises a tunnel body, the construction adit, an air conditioning chamber, a connecting tunnel and a plugging structure body. A construction adit is arranged on the downstream portion of the tunnel body, the construction adit is divided into an upper construction adit and a lower construction adit which are connected with the upper end and the right end of the air conditioning chamber respectively, and the air conditioning chamber is connected with the tunnel body through a connecting tunnel. The plugging structure comprises five sections. The invention further provides a construction method of the plugging structure. The construction method comprises the five steps of surrounding rock pretreatment, main plugging section construction, transition plugging section construction, auxiliary plugging section construction and quality detection. By means of multi-section differential plugging design and targeted grouting measures, the method effectively adapts to periodic pressure fluctuation of the air cushion type surge chamber, the compactness, impermeability and overall stability of a plugging body are improved, construction parameters are clear, quality is controllable, and the method is suitable for water conservancy project hydraulic tunnel construction adit plugging scenes; and the method has good engineering applicability and economic benefits.

The invention provides a large and long tunnel gas pre-extraction method based on a surrounding rock pressure relief principle, and belongs to the technical field of tunnel construction. Drilling from the earth surface to the central area of the tunnel and coal seam intersecting surface to form a footrill; a main roadway is tunneled from the tail end of the footrill, and the trend is adjusted to be parallel to the coal seam inclination direction at the position close to the coal seam; auxiliary roadway networks are tunneled towards the two sides on the basis of the main roadway, and a manual pressure relief space is formed to replace a protective layer; dense crossing drilling holes are constructed in the coal seam in the auxiliary roadway, and hydraulic slotting pressure relief and permeability increase are carried out; and gas is extracted through the roadway network until the standard is reached, and finally grouting plugging is conducted. Complete parallel operation of gas extraction and tunneling is achieved through ground roadway engineering independent of a tunnel main hole, and the construction period is greatly shortened. The gas extraction efficiency and safety of the low-permeability coal seam are improved by combining the manual pressure relief space with hydraulic slotting, and the method is suitable for large and long tunnel engineering penetrating through gently-inclined and inclined high-gas coal seams.

This utility model provides an escape hydraulic structure for a pumped storage power station combined with a maintenance gate tunnel and a construction adit. It includes an inlet / outlet maintenance gate tunnel, the first end of which connects to the construction adit. The construction adit serves as an escape passage. A staircase is installed inside the inlet / outlet maintenance gate tunnel and connects to the construction adit. This utility model meets the fire safety requirements of the inlet / outlet maintenance gate tunnel. In case of emergency, personnel can escape to a safe area outside the tunnel via the escape passage.

The invention provides a high access step type continuous stoping subsequent filling mining method, and belongs to the technical field of metal mine mining, the mining method comprises the following steps: tunneling a lower layered operation space of an initial stoping unit, carrying out top-lifting construction on an upper layered operation space, and piling up a ramp; stoping the upper layer and then the lower layer until the end; after a goaf is formed through stoping, top-contact-free filling is conducted for the first time, and a circulating operation space is reserved; a first avoiding chamber is tunneled in the cyclic operation space, a lower layered operation space of a next stoping unit is constructed in a top-picking mode, and then the cyclic operation space is filled; a second avoiding chamber is tunneled, a layered operation space on a next stoping unit is constructed in a top-lifting mode, and a ramp is built in a heaping mode; and after the upper layer is stoped, the lower layer is stoped until the lower layer is communicated with the draw shaft, and the rest part of the upper layer is stoped after a third avoiding chamber is tunneled. And after stoping, adopting non-roof-contact filling and reserving a circulating operation space, repeating the working procedures until stoping is finished, and fully filling the last goaf. And efficient mining is achieved by optimizing the stoping and filling process.

The application provides a flat adit geological structure surface occurrence calculation method, device, equipment and medium, relates to the technical field of structure surface occurrence calculation; the method comprises the following steps: obtaining three-dimensional point cloud data of the flat adit; obtaining a three-dimensional central axis point set of the flat adit; constructing a fitting circumscribed circle for projection; obtaining two-dimensional unfolded plane point cloud data; obtaining a flat adit two-dimensional plane image; obtaining a flat adit structure surface trace; obtaining three-dimensional point cloud data of the structure surface trace; based on the three-dimensional point cloud data of the structure surface trace, the principal component analysis method is used for processing, a fitting plane is obtained; based on the fitting plane, structure surface occurrence parameter information is obtained; the method of the application can efficiently and safely calculate the structure surface occurrence through point cloud, can quickly obtain dense area data, is especially suitable for dangerous or complex terrains that are difficult for people to reach, and can significantly improve the geological information acquisition efficiency and accuracy through automatic processing to ensure high precision and objectivity of the result.

This invention provides a method for excavating an underground cavern in a power plant and the underground cavern itself, relating to the field of hydraulic engineering technology. The underground cavern includes a main transformer tunnel, a main power plant, and a busbar tunnel, with the busbar tunnel connecting the main transformer tunnel and the main power plant. The underground cavern also includes a construction adit. The excavation method for the underground cavern includes the following steps: excavation work is carried out on the upstream side of the bottom of the main transformer tunnel to form a construction adit; at least part of the excavation work of the busbar tunnel is carried out through the construction adit in parallel with at least part of the excavation work of the main power plant; the busbar tunnel and the main power plant are excavated to connect, and the intersection area of ​​the busbar tunnel and the main power plant is reinforced with support. This invention can effectively improve the overall construction progress and efficiency of the underground cavern.

This invention discloses a water-stopping structure for a structural joint in an earth-rock dam gallery, relating to the field of water conservancy and hydropower engineering technology. It includes surrounding rock, a grouting adit, and a foundation gallery. A structural joint is provided between the grouting adit and the foundation gallery. A concrete water-stopping base is located at the bottom of the foundation gallery. A water-stopping structure is provided on the structural joint, comprising a first copper water-stop and a second copper water-stop. This invention uses two copper water-stops in the structural joint, with the first copper water-stop embedded in the concrete water-stopping base at the bottom, thus improving the seepage prevention reliability of the structural joint.

The invention discloses a pumped storage power station tunnel type semi-underground main exhaust machine room system and a design method thereof, an exhaust adit and a machine room tunnel form a T-shaped tunnel, a main exhaust machine room is arranged in the machine room tunnel, and an entrance of the machine room tunnel is adjacent to a hillside road. According to the method, slope excavation and slope supporting work of the ground main exhaust machine room platform is reduced, the exhaust adit is directly connected with the machine room tunnel, after the machine room tunnel is opened, the exhaust adit can be directly excavated, it is not needed to wait for slope excavation and slope supporting work of the ground main exhaust machine room platform to be completed, and the excavation efficiency of the exhaust adit is improved. The construction period is shortened, meanwhile, the whole exhaust channel can be opened as soon as possible, and favorable conditions are created for ventilation of underground workshops; the machine room tunnel is close to the existing hillside road during site selection, so that the existing hillside road resources can be well utilized, the road construction work leading to the main exhaust machine room is reduced, the construction period is greatly shortened, and the engineering investment is saved.

The application provides a long-pressure penstock emptying system without a gate valve at the end of the penstock and a working method thereof, which comprises a water inlet, a long-pressure penstock, a pressure pipeline and a plant in sequence, a pressure regulating chamber is arranged at the joint of the long-pressure penstock and the pressure pipeline, a construction adit is arranged at the end of the long-pressure penstock, the construction adit is arranged on the upstream side of the pressure regulating chamber, a maintenance gate is arranged at the end of the long-pressure penstock close to the construction adit, a water collecting pit is arranged at the bottom of the long-pressure penstock close to the construction adit, a drain pipe is communicated with the bottom of the water collecting pit, one end of the drain pipe is connected to the outside through the construction adit, a working valve is arranged at the water outlet end of the drain pipe, the water collecting pit is arranged to actively collect seepage water, the construction adit is used as a seepage water leading channel of the long-pressure penstock, and the seepage water in the long-pressure penstock can be effectively drained; the temporary water blocking sandbags can be quickly arranged and removed, and the seepage water can be effectively prevented from flowing into the pressure pipeline downstream.

The application discloses an open-pit mine pit slope adit water plugging method, and belongs to the technical field of mine facilities, which comprehensively adopts multi-level measures such as retaining walls, waterproof cloth, dikes and plant ecosystems to ensure that excellent waterproof effect is realized under extreme hydrological conditions, water intrusion and soil erosion risks are effectively reduced, and the stability of the adit structure is enhanced by engineering means such as overloading columns, pile foundations and anchoring treatment, the potential risks of geological landslides and soil settlement are reduced, the sustainability and safety of the mine pit slope are ensured, the amphibious plants used in the method not only play a role in waterproofing, but also provide important habitats for the ecosystem, improve vegetation coverage and wildlife habitats, are beneficial to ecological restoration and protection, the construction cost of the overall scheme is low, and no subsequent maintenance operation is needed, and the construction flexibility is high.

The invention discloses a multi-adaptive collaborative mining method for gently inclined thin and medium-thick bauxite. Comprising the following steps that S1, mining areas are divided in the ore body trend, and isolation ore pillars are reserved; s2, a collaborative development network is constructed, wherein the collaborative development network comprises a main adit, a belt transportation main roadway, an air inlet lifting inclined shaft and a belt air return inclined shaft; s3, the mining area is divided into two small mining areas with the two inclined shafts as boundaries, the ore body thickness of each area is determined through exploration, and distribution of thin ore bodies and medium-thickness ore bodies is recognized; s4, multi-process collaborative deployment: deploying a fully-mechanized coal mining system for the medium-thick ore body area; for the thin ore body area, a room-and-pillar method system is deployed; s5, collaborative recovery: deploying an access method system for recovery for an area in which the fully-mechanized coal mining system and the room-and-pillar method system are not deployed; s6, ore transportation and ventilation are conducted through a unified collaborative development network, and efficient and safe mining of the whole mining area is achieved; through the design of one system and multiple processes, the device perfectly adapts to the complex thickness change of gently inclined bauxite from thin to medium thickness, and the industrial problem that water and soil are not suitable for a single method is solved.

The utility model discloses a digital monitoring system for exploring adit construction safety of a pumped storage power station. The digital monitoring system comprises a digital monitoring system platform, and a personnel positioning system module, a video monitoring system module, an environment monitoring system module, an information issuing system module and a blasting early warning system module which are connected with the digital monitoring system platform, wherein the digital monitoring system platform is used for displaying information of operating personnel, scene images of a construction site and the like; the personnel positioning system module collects information of operating personnel and the like; the video monitoring system module acquires a construction site scene image in real time; the environment monitoring system module collects environment data; the information issuing system module is used for displaying team information, on-site conferences and other contents of constructors in the tunnel in real time; the blasting early warning system module collects operation blasting information. According to the utility model, joint actions of facilities can be automatically supervised, the emergency response speed and the event handling speed are improved, and the management level and the management efficiency of a construction site and the construction safety are effectively improved.

The invention discloses a factory dam area seepage control method, and relates to the technical field of factory dam area seepage prevention. The seepage control method for the factory dam area comprises the following steps that S1, a dam foundation curtain, a plant curtain and an auxiliary dam curtain are arranged, and the dam foundation curtain and the plant curtain are connected to form a whole; s2, multiple layers of grouting adit are formed in the left bank and the right bank of the dam, and the grouting adit of each layer of the right bank of the dam is connected with the grouting adit of the plant; s3, a first drainage curtain is arranged according to the position of a foundation curtain of the dam, multiple layers of drainage horizontal holes are formed in the elevation of the first drainage curtain, and a second drainage curtain is arranged on a dam toe of the dam body; and S4, a drainage curtain is arranged on the secondary dam, and a resistance body drainage horizontal hole and a plunge pool drainage horizontal hole are formed between the second drainage curtain and the dam foundation drainage curtain of the secondary dam. According to the seepage control method for the factory dam area, seepage of the factory dam area can be effectively controlled, the seepage stability of the anti-seepage curtain and the rock mass meets the requirement, and long-term safe operation of a project is guaranteed.

The invention discloses a water gushing treatment method for a tunnel adit, and aims to solve the technical problems that drainage of the tunnel adit is difficult and potential safety hazards exist in a complex strong water gushing environment. Advanced geological forecast is carried out on the tunnel face of the adit by adopting a geophysical prospecting method in combination with a horizontal advanced hole exploration mode, and the geological forecast precision of the unexcavated water-rich section of the adit is improved; through the graded relay drainage system, the technical problem that water burst in the adit moves along with the tunnel face of the adit and is not pumped and drained in time is solved; through the cooperative water blocking structure of advanced fixed-point grouting, system grouting and chemical grouting and in cooperation with a drainage system, groundwater exposure of the water-rich section of the adit is restrained, the current situation that a water curtain hole of the water-rich section of the adit is excavated is effectively improved, and the construction safety coefficient is greatly increased.

The utility model discloses a distribution system for improving slag slipping efficiency of a slag slipping well. The distribution system comprises the slag slipping well; a lower adit is arranged on the lower portion of the slag slipping well. An upper adit is arranged on the upper portion of the slag slipping well. The telescopic rod stretches out and draws back to drive the slagging-off hopper on the arm plate to swing, the slagging-off hopper is driven by the motor to rotate to scrape and pull down muck in the top area of the sliding slag accumulation body towards the lower adit, the problem that the top of the muck accumulated in a cone can block the bottom of the sliding slag well is solved, and the efficiency of sliding the muck towards the lower adit of the sliding slag well is improved.

The invention discloses a virtual adit-based slope structural plane model construction method. The method comprises the steps of generating a real adit model which corresponds to each real adit and considers spatial variability of a structural plane at the same time; geometric features and deterministic structural plane features of a real footrill model are comprehensively considered, and a plurality of virtual footrill models which consider structural plane space variability and consider continuous random change of the structural plane along the elevation simultaneously are generated. According to field actual footrill data, structural plane characteristics of a blank area without footrill exploration are truly restored as much as possible, and a structural plane network model conforming to geological authenticity is established for subsequent slope stability evaluation work. According to the method, the structural plane network constructed in the model meets the actual adit revealing conditions, meanwhile, the spatial variability of the distribution characteristics of the structural planes of different parts of the slope is considered, and the problem that in rock slope numerical calculation, the structural plane model deviates from reality and influences slope stability evaluation is solved.

This invention discloses a sealing body and sealing method for a construction adit of a diversion tunnel, comprising an outlet sealing body located at the outlet of the construction adit and an inlet sealing body located at the inlet of the construction adit. The inlet sealing body is constructed of micro-expansion concrete, and its cross-sectional shape matches the cross-section of the construction adit. The inlet sealing body also includes a water pressure balancing system and a surrounding rock bonding system. The water pressure balancing system includes at least one row of drainage holes located at the bottom of the inlet sealing body and penetrating the inlet sealing body along the axis of the construction adit. The surrounding rock bonding system includes system reinforcing bars arranged around the perimeter of the inlet sealing body in contact with the surrounding rock, and backfill grouting pipes pre-embedded in the top arch of the inlet sealing body. This invention can significantly optimize the structural dimensions of the outlet sealing body and significantly enhance the stability of the inlet slope of the construction adit.

The present application relates to a kind of underground metal mine rail unloading system construction method.Prospecting construction includes the construction of mine warehouse and unloading chamber construction in turn, reverse excavation guide adit excavation, unloading station bottom structure excavation, branch chute excavation and mine warehouse extension brush.Protection construction includes safety closed platform and reinforced concrete and rail support.The present application changes the mode of previous whole rail unloading system single sequence construction, fully utilizes reverse excavation guide adit and temporary closed operation platform, realizes rail unloading station bottom structure, branch chute, mine warehouse sub-department once excavation forming in vertical space range, segmented parallel operation support new idea, changes excavation sequence, construction safety closed platform and other measures, changes original rail unloading unloading system construction mutual restriction, operation space is limited, measures engineering is more complicated situation, greatly shortens construction period.

The invention is suitable for the field of water conservancy and hydropower engineering, and provides an automatic energy-saving plug structure for a long pressure water delivery tunnel adit, which comprises a plugging grouting system, a rotary single-opening plane gate and an automatic drainage check valve, the plugging grouting system comprises a concrete plugging structure and a maintenance channel, the concrete plugging structure is poured in the adit, and the maintenance channel is reserved in the middle of the concrete plugging structure. The rotary single-opening plane gate is installed on the side, close to the main hole, of the overhaul channel and used for controlling opening and closing of the overhaul channel. The automatic drainage check valve is embedded in the concrete plugging structure, communicates the branch hole with the main hole and is used for discharging accumulated water in the branch hole into the main hole in a one-way mode, and the automatic drainage check valve has the advantages of being good in safety and low in operability, low in manufacturing cost, capable of achieving automatic drainage, convenient to operate, convenient and fast to use and the like. The problems that in the prior art, a plug overhauling function is lacked, an overhauling channel is difficult to open, and accumulated water on the outer side of a plug is difficult to treat are solved.

The invention discloses a laser scanning identification method for footrill revealed fault set elements, and belongs to the field of engineering geological exploration and the field of surveying and mapping. The method comprises the following steps: collecting footrill data by using a laser scanner; conditions which need to be followed by footrill fault element exposure are stipulated and include the rust dyeing degree, the fault occurrence and the fault width, a method for obtaining fitting planes on the two sides of a fault in the fault occurrence is combined, a point on one face serves as a starting point to draw a plurality of vertical lines towards the other face, and the range value of the width is obtained; according to the fault interlayer filling condition, when the fault interlayer is only filled with pure mud or rock vein, the fault interlayer is visually visible in adit scanning data, and recording is conducted through human eye recognition; and when the interlayer filling is under the complex condition that gravel is clamped by mud or gravel is clamped by mud, a recording method based on a scanning model is adopted. According to the method, three-dimensional laser scanning characteristics and recording modes of fault elements are associated, and the method aims at avoiding the interference of the influence of adverse environments and the influence of personal errors in traditional footrill investigation operation.

The utility model relates to the technical field of adit construction equipment, especially a non - blasting adit driving device, including main frame, the top of main frame right side installs hydraulic lift mechanism, the top of hydraulic lift mechanism is installed with first sprinkling pipe through pipe clamp, the right side of hydraulic lift mechanism is installed with rotary cutting part, the bottom of main frame right side installs the material gathering shovel, the top of material gathering shovel is installed with second sprinkling pipe through pipe clamp, the back of main frame top is installed with water storage tank through bolt, the right side of water storage tank is connected with booster pump. Booster pump sends water to first sprinkling pipe and second sprinkling pipe respectively, sprays to cutting rock wall and material gathering shovel respectively, carries out dust suppression treatment to the dust produced by cutting and the stone residue collected in material gathering shovel respectively, this can effectively prevent a large number of dust pollution working environment, avoids personnel inhalation and guarantees health.

The present application relates to the technical field of abandoned pyrite mine management, and particularly relates to a system and method for treating acid waste water at the source of abandoned pyrite mine adit, comprising an acid waste water in-situ treatment device, a flow guide device, a seepage prevention structure arranged on the surface of residual waste rock at the bottom of the adit, a grouting reinforcement water stop structure arranged around the over-standard gushing water point and the seepage point, and a surface sealing seepage prevention layer arranged around the exposed surface of the broken rock mass, the over-standard gushing water point and the seepage point; the acid waste water in-situ treatment device is arranged at the adit opening, and is used for collecting and treating acid waste water; one end of the flow guide device is located below the over-standard gushing water point and the seepage point, and the other end extends to the outside of the adit, and is used for guiding the unpolluted gushing water and seepage water to the outside of the adit for discharge. The present application can better solve the problem of continuous gushing water in the pyrite mine adit in the region with complex geological conditions by in-situ treatment of the adit of the abandoned pyrite mine, including hole wall seepage prevention, clear water dredging, waste rock storage and waste water treatment.

The application provides a water tunnel construction adit plugging structure and a construction method. The plugging structure comprises a tunnel main body, a construction adit, an air conditioning room, a connecting tunnel and a plugging structure. The construction adit is arranged downstream of the tunnel main body, and the construction adit is divided into upper and lower construction adits and connected to the upper end and the right end of the air conditioning room respectively. The air conditioning room is connected to the tunnel main body through the connecting tunnel. The plugging structure comprises five sections. The application also provides a construction method of the above-mentioned plugging structure, which comprises five steps of surrounding rock pretreatment, main plugging section construction, transition plugging section construction, auxiliary plugging section construction and quality detection. Through multi-section differential plugging design and targeted grouting measures, the application effectively adapts to the periodic pressure fluctuation of the air cushion type surge chamber, improves the compactness, impermeability and overall stability of the plugging body, the construction parameters are clear, the quality is controllable, and the application is suitable for the water tunnel construction adit plugging scene of water conservancy projects, and has good engineering applicability and economic benefits.

The utility model provides an arrangement structure for increasing the minimum pressure at the tail end of a water diversion upper adit, which comprises an upper reservoir water inlet / outlet, an emergency gate shaft, the water diversion upper adit and a water diversion inclined shaft which are sequentially arranged downwards from upstream, lining concrete is poured in the emergency gate shaft, and a gate groove is formed in the middle of the lining concrete. Gate groove concrete is poured at the four corners of the gate groove respectively, a breast wall is arranged between the two gate groove concrete located on the upstream side, the breast wall is located on the lower portion of the lining concrete, and the bottom face of the breast wall is connected with a water diversion upper adit. Therefore, the size of an orifice at the joint of the lower portion of the gate groove and the water diversion upper adit is reduced, the minimum pressure of the tail end of the water diversion upper adit in the hydraulic transient process is improved, the structure is simple, construction is convenient, the excavation volume of elevation increase of a water inlet and a water outlet is avoided, and engineering investment is saved.

The invention discloses a small TBM tunneling method suitable for exploring an adit, and relates to the technical field of water conservancy and hydropower engineering.The small TBM tunneling method comprises the following steps that S1, a site is assembled; s2, the starting hole is excavated; s3, the TBM equipment performs normal tunneling; and S4, returning the whole machine. According to the method, the exploration period can be effectively shortened, the safety performance is good, the construction efficiency is high, the formability of an excavated section is good, geological logging is more facilitated, blasting influence is avoided in construction, disturbance to surrounding rock is small, cavern stability is facilitated, and the supporting workload is small. The safety is relatively high, and the influence on the environment is relatively small. Geological boundaries, faults and the like exposed out of the tunnel wall are clearer and clearer, careful observation, accurate positioning and detailed description of various geological original data are facilitated, and good conditions are created for geological logging of the geological exploration adit.