169 results about "Groundwater seepage" patented technology

The invention relates to a subsurface flow simulating and predictive analysis method which comprises the following steps of: dynamically observing and collecting groundwater date of a mining area, integrating the groundwater data into a graphic workstation by utilizing a data engine, automatically establishing a finite element mesh model of the dynamic water level of each water layer, and determining parameter partitions and corresponding parameter values so as to realize the dynamic analog of water level of the water layer and the simulation of groundwater migration; and carrying out the simulation of a groundwater seepage field and the dynamic and real-time simulation of aquifer in designed software and hardware environments, and carrying out interactive analysis, prediction and evaluation on various models in the VR environment and the WEB environment by using tools such as interactive operation, information inquiry, and the like. The method can provide the scientific basis of reasonably developing and utilizing water resources for the future development and the evolution tendency of groundwater resources, and achieves low overall cost, easy popularization and use as well as flexible and reliable operation.

The invention discloses a testing device and a testing device method for simulating collapse of tunnel surrounding rock under conditions of rainfall and underground water seepage. The testing device comprises a model testing box, a rainfall adjustable simulating system, an underground water seepage simulating system, an underground water supplying system, a water content testing system, a stress monitoring system, a digital radiography noncontact measuring system and an optical fiber bragg grating displacement monitoring system. By simulating a progressive failure process of tunnel weak broken surrounding rock under the action of seepage of surface water and underground water, mechanical behaviors of crushing the surrounding rock under different rainfall conditions and different underground water seepage path conditions are quantitatively researched. By obtaining multiple-physical field information in a tunnel surrounding rock collapse process, multi-information features in different evolutionary phases and internal links of information of all fields of the collapse are analyzed, a progressive failure process and fracture morphology and ranges of the tunnel weak broken surrounding rock under different factors are determined, and the effective basis is provided for disclosing a progressive failure principle and a dynamic pressure arch effect of the weak broken surrounding rock under conditions of rainfall and underground water seepage.

The invention relates to a transparent soil test method for simulating groundwater seepage of a drawdown and confined aquifer of a foundation pit. The method comprises the following steps: filling a model box with a transparent material in layers; installing a drawdown well pipe, sealing bearing plates and a tracer agent tube and connecting a pressure measuring plate; injecting a liquid into the model box to ensure that the supplemental water level is stable and fixed in the test process; starting the drawdown well pipe, continuously adjusting the pumping speed to reach the drawdown requirements; after the pumping speed is stable, releasing a tracer agent into the model box and shooting the flowing state of the tracer agent by a high-speed camera; and measuring pore-water pressure and change of different layers in the measurement test process by a pore-pressure measuring device. According to the transparent soil test method, the seepage path of the flow at the periphery of a waterproof curtain can be directly observed; related parameters of the seepage path law, the seepage speed and the like can be accurately analyzed through a picture shot by the high-speed camera; and the seepage law of the underground water in foundation pit rainfall is obtained by changing the insertion ratio of diaphragm walls, the length of a pumping filter pipe and the plane and section distances between different diaphragm walls and the filter pipe.

The invention discloses a GMS-based (groundwater modeling system) forecast method for ground water seepage fields at different mining levels of a mining area. The method comprises the steps that through performing analytical investigation on hydrogeological conditions of an area, boundary conditions and water containing bodies are generalized, ground water runoff conditions are analyzed, and coefficients of each source sink term are determined; the GMS is adopted to perform finite difference grid division on a simulation area, an initial water head is determined based on the water level of an observation well, hydrological parameters of each simulation sub-area are determined based on a pumping test and the provided data, hydrological module types of the source sink terms in the area are analyzed, assignment is performed on a corresponding hydrogeological map layer by combining the determined source sink term coefficients, and then a subarea map of the osmotic coefficients at different mining levels is obtained; prediction models for ground water seepage fields of a mining area are established based on GMS, and the observation data is utilized to adjust the hydrogeological parameters of the models, and finally, simulation is performed by combining with the discharge capacities at different mining levels to obtain the ground water seepage fields at different mining levels. The method has the advantages of convenience in operation, excellent three-dimensional visualization function and reliable result.

The simulator includes following parts and structures: water storage tank with water pump; simulation chamber with floor plate being retained at horizon; water supply cavity inside the simulation chamber; simulation cavity with water bearing; pumping well; top impermeable layer is on superface of water bearing; pervious mesh boards; flooding backwater cavity in constant head flooding chamber located at upstream end is connected to water storage tank; flooding backwater cavity in pumping flooding chamber located at down stream end is connected to water storage tank; at least three sets of glass tube for measuring pressure are installed on wall of simulation cavity; passing through wall of simulation cavity, ends of flexible tubes connected to bottoms of tubes of measuring pressure are inserted to water bearing. The invention can determine hydrogeologic parameter and water output from water bearing, reveals state of seepage, water bearing and structure of pumping well.

The invention relates to a construction method for utilizing a grouting freezing pipe to reinforce and freeze a contact passage to restrain frost heaving and thaw collapsing. A freezing pipe is used as a grouting pipe simultaneously, the grouting freezing pipe is characterized by being composed of the grouting pipe I and a liquid supply pipe II, wherein the grouting pipe I is composed of 3-6 sections, a drill bit III is installed at the pipe end of the first section, and the two sides of a pipe body are each provided with a one-way valve IV; the liquid supply pipe II is formed by two steel pipes in a crossed and welded mode, a certain amount of cement paste is added into and mixed with the soil body to improve physical and mechanical properties of the soil body, and the influence of frost heaving and thaw collapsing on surrounding strata and buildings can be restrained when contact passage freezing reinforcement is conducted. The construction method comprises the steps of construction preparation, positioning and drilling, grouting, liquid supply pipe installation, refrigerating system installation and freezing by starting a machine after maintenance. The construction method has the advantages that the cement soil is utilized for reinforcement, the strength of the soil body is further strengthened, the anti-permeability and the self-stability capacity of the soil body and the water stop performance of the contact passage strata are enhanced, groundwater seepage is effectively controlled, and the safety of later excavation and construction is improved.

The invention provides a pouring and injection integrated indoor testing device and method for monitoring underground water seepage and precipitation. The pouring and injection integrated indoor testing device comprises a visualized round model barrel; a plurality of water penetrating plates are inserted into the visualized round model barrel; a rectangular soil sample box is formed between the water penetrating plates; a soil sample is stored in the rectangular soil sample box; a recharge well and a water precipitation well, which are connected with a water supply device, are inserted into the soil sample, and can be used for pumping and injecting water layer by layer; a pore water osmotic pressure sensor, a soil pressure sensor, a displacement sensor and a water pressure metering instrument, which are connected with an information analysis system, are buried in the soil sample; a water level variable water tank chamber is formed between the water penetrating plates and the round model barrel; and the water level variable water tank chamber is used for simulating a real working condition by controlling the height of a water level through flow control valves mounted on the recharge well and the water precipitation well.

The invention provides a single-well underground water seepage flow velocity and flow direction measuring method and measuring instrument. The measuring instrument includes a controller and a seepage detector, the seepage detector includes a shell, an upper separator plate, an inclinometry integrated sensor, a pendulum bob and pressure sensors, the pendulum bob and the center of the upper separator plate are connected through a string, due to the function of water flow, a pendulum ball at the bottom of the pendulum bob is subjected to continuous seepage force, the seepage force is transited to the adjacent pressure sensor through a disc, at the same time, the inclinometry integrated sensor measures an inclination angle and an azimuth angle of the measuring instrument and azimuth angles of the pressure sensors, a gravity component of the pendulum bob at the moment can be known, and through vector calculation of force, the magnitude and direction of the seepage force can be judged and thus is indirectly converted into the flow velocity and flow direction of seepage. The measuring instrument has the characteristics of simple structure, low power consumption and the like, and the measuring method can be widely applied to seepage condition monitoring of underground buildings or rock and earth masses such as side slopes, underground diaphragm walls and dams.

The invention discloses a method for observing obstruction of microbial groundwater seepage and blockage as well as a device thereof. The method comprises the followings steps: (1) adding a porous medium to an experiment box; (2) regulating water level of an upstream control water tank to stabilize the water flow, constantly illuminating with a light source, and recording light rays from the box; (3) recording the water level and nutritive substances of the control water tank by a digital camera and storing the images; (4) quantitatively analyzing microbial aggregation density and porous medium density, obtaining a sample containing microbe aqueous solution and the porous medium from a sampling valve of the experiment box; and (5) killing microbes by the ultraviolet ray; wherein, the experiment box is equipped with a valve, a filter screen and a water storage tank which is connected with a water pump, the water pump is connected with the control water tank, and a water inlet tube is connected with the experiment box. The method helps directly observe and record the propagation and migration of the microbes in the porous medium, the blockage manner and change of a water flow passage, obtains the observation data, facilitates the control of the microbial activity and sampling analysis, and is applicable to simulation research of the microbial seepage and obstruction problem in a groundwater source heat pump system.

The invention discloses a combined mixed-discharge technology for mining barren rock soil and solidified tailings, which is capable of systematically researching burying characteristics, hydrogeologic conditions, mining process and discharged refuse materials of natural geology and foundation rock layers of the areas with a refuse dump and physico-mechanical properties of the foundation, analyzing and calculating relative parameters of the refuse dump, then analyzing bearing capacity of the refuse dump and respectively calculating settlement capacity and heaving floor of the foundation of the refuse dump according to limiting equilibrium principle, designing the solidified tailings (7) into a trapezoidal structural body with upper wide and bottom narrow and distributing the solidified tailings in various platforms of the refuse dump at certain intervals to form a mining barren rock soil and solidified tailing combined mixed-discharge refuse dump. The mining barren rock soil and solidified tailing combined mixed-discharge refuse dump is subjected to elastoplasticity finite-element analysis, ground water transfusion field analysis and stability and reliability analysis, and finally soil discharge technology and soil discharge parameters of the mining barren rock soil and solidified tailing combined mixed-discharge refuse dump are optimized. By the aid of the combined mixed-discharge technology for the mining barren rock soil and solidified tailings, safety potential hazards existing in tailing warehouses are eliminated, the problem of difficulty in land acquisition for construction of the tailing warehouses is solved, normal production of mines can be guaranteed, and foundation construction cost of the tailing warehouse and long-distance transporting cost of the tailings and operation cost are all saved.

The invention discloses a test apparatus and test method for simulating a tunnel-side slope system under effects of rainfall and earthquake. The apparatus includes: an artificial rainfall test system,an underground system, a uniform airbag loading system, a model test box, an earthquake action platform, and a test monitoring system; a test object is placed on the bottom of the uniform airbag loading system in order to apply a load to the test object thereby; the test object is arranged in the model test box; the artificial rainfall test system can simulates rainfall, wherein a water outlet end is located on the uniform airbag loading system; the earthquake action platform is disposed on the bottom of the model test box. By means of model test with the test apparatus, instability mechanismof the tunnel-side slope system under effects of rainfall, underwater seepage, earthquake and the like and coupled effects thereof can be discovered. The apparatus and method can supply effective basis for tunnel construction, disaster prevention and control of side slopes, and monitoring, management and prediction.

The invention discloses a simulator for blocking groundwater seepage by an underground structure, belonging to the technical field of building engineering, and comprising a water tank, a model box, baffles, a phreatic aquifer, an aquiclude, a confined aquifer, a displacement meter and a water level observation pipe, wherein the water tank is connected with a model box, the model box is internally and vertically provided with a plurality of baffles, the phreatic aquifer, the aquiclude and the confined aquifer are sequentially and horizontally paved in the model box from the top down, the displacement meter is vertically installed on the surface of the phreatic aquifer, and the water level observation pipe is vertically embedded in the confined aquifer of the model box and sequentially perforates the phreatic aquifer and the aquiclude. By adopting the invention, groundwater three-dimensional seepage and soil mass deformation condition of the soil mass having the underground structure at each moment can be conveniently and efficiently observed, and real, exact and efficient parameters are provided for the design and the construction by analyzing test results, such as water head change, the ground subsidence distribution and the like, thereby the high efficiency and the safety of an urban underground engineering construction can be ensured.

The invention discloses a method for leaking stoppage of an external wall of an underground structure, which comprises the following steps: (1) drilling the external wall of the underground structure; (2) embedding a grouting pipe; (3) grouting; and (4) cutting the grouting pipe, and repairing the hole. The method adopts a path opposite to the ground water seepage path, and the cement slurry is filled in the gap on the back of the wall, thereby realizing the purpose of stopping water. The active leaking stoppage outside the side wall of the underground structure is achieved through drilling the external wall of the underground structure, embedding the grouting pipe, filling the seepage crack with the cement slurry and blocking the water flow channel. Therefore, the method has a wide scope of application, and can be used for seepage treatment of cracks caused for different reasons. The construction is simple, the scope of one-time treatment is large, and the cost of the method is lower than the method of leaking stoppage through chemical grouting. Moreover, no grouting of crack slots is needed for leaking stoppage, thereby reducing the damage to the concrete appearance; and simultaneously, the effect of leaking stoppage is good, and no repeated leakage can occur. Therefore, the method can be widely applied in leaking stoppage of construction joints, expansion holes, settlement joints, temperature shrinkage cracks and other cracks.

The invention relates to a method for advanced forecast of a tunnel water inflow position. The method comprises the following steps: firstly measuring the flow rate and the flow direction of underground water at any space point in an underground water seepage field by utilizing a single well isotope tracer method, then establishing a concept model, deducing the rough water inflow position and the water inflow through mathematics deduction, finally performing local temperature measurement and drilling and obtaining the accurate water inflow position according to the temperature effect of the underground water on a rock body. The method provided by the invention has the benefits that the accuracy is high, the workload is reduced, and the effect of human factors is avoided; meanwhile, the method is not affected by tunnel construction and also has no effect on the tunnel construction, and the tunnel forecast efficiency is improved.

The invention relates to a U-type ground heat exchanger heat and moisture transfer performance simulation test device and test method, which belongs to the technical field of ground-source heat pump air-conditioning. The device comprises a constant temperature water area, a circulating water pump, a sand test bed, a U-type ground heat exchanger, a constant temperature remote boundary simulation system, a groundwater seepage simulation system, a flow meter, a flow control valve, a temperature sensor, a humidity sensor and a data acquisition device. According to the invention, experiments of the influence law of soil type, soil stratification, borehole backfill materials, soil moisture content, soil original temperature, inlet water temperature, fluid flow and the like on the heat transfer performance of the U-type ground heat exchanger can be completed; heat transfer characteristic experiments of the U-type ground heat exchanger under the conditions of groundwater seepage and heat and moisture migration can be carried out; tests of a variety of working conditions can be carried out; and the defect that simply the heat transfer performance of the U-type ground heat exchanger under the condition of a test hole can be acquired through the existing test device, while the influence law of different factors on the heat transfer performance of the U-type ground heat exchanger under different working conditions cannot be acquired is overcome.

The invention provides a laboratory simulation test method for researching underground water seepage obstruction caused by a pile foundation. The laboratory simulation test method comprises the following steps of 1, soil pavement and test preparation, 2, water injection pressurization, 3, self-weight consolidation, and 4, a laboratory seepage test. The laboratory simulation test method can conveniently and effectively observe and research underground water seepage in soil with a pile foundation, can research the influence produced by the number, depth and arrangement of pile foundations on underground water seepage by analysis of water head distribution in the test, can provide reasonable and feasible computing design parameters for design and construction, and is used for guaranteeing safety and efficiency of ground pit construction in the urbanization process.

The invention relates to a control system of hydraulic boundary conditions in a water bearing layer during a similar model test, which comprises a test bench, a booster pump and a data processing device, wherein similar materials are laid in the test bench; a tunnel and a non-watertight film bag are arranged in the similar materials; a cavity in the non-watertight film bag is connected with the booster pump through a water inlet pipe; and the booster pump is connected with the data processing device. The invention has the advantages that: (1) the hydraulic boundary conditions in any selected position under any geological condition during the similar model test can be successfully controlled; (2) successful laying of the similar materials can be ensured, and the non-watertight film bag canbe laid in any position according to any shape, thereby simulating groundwater seepage or water inrush under special conditions; (3) the film bag has small volume and large flexibility, thus, after the film bag is embedded in the similar materials, the film bag can synchronously deform along with the similar materials, and the influence on the mechanical property of the similar materials at the periphery of the current position is less; and (4) the data processing device can control the hydraulic boundary conditions in the position of the film bag in the similar materials through the booster pump according to the engineering background and simulating requirements.

The invention provides a pressure bearing water level determining method for constant-flow water pump of a lower foundation pit of a suspension type waterproof curtain. According to the method, the ground water level when the waterproof curtain doesn't enter an aquifer and the ground water level change caused by the waterproof curtain are determined in a constant-flow water pumping process based on obtained soil layer information and water pumping information of the pressure bearing aquifer and according to the Darcy law and the water volume conservation principle. Thus, pressure bearing water levels in and out the lower foundation pit of the suspension type waterproof curtain in constant-flow water pump can be determined. By means of combination of the Darcy law, the water volume conservation principle and the ground water percolation theory, the distribution of pressure bearing water levels in and out the foundation pit can be visually reflected in foundation pit dewatering. Therefore, basis for analyzing effects of foundation pit dewatering on the surroundings is provided. The method is simple, practical, convenient to popularize and large in application value.

The invention discloses a numerical simulation method for an interval tunnel in a water-rich area. The method mainly comprises the following steps of 1, calculating earthquake waves, building a three-dimensional finite element model of the interval tunnel, and simulating a soil layer by adopting an entity unit; 2, determining earthquake fortification intensity of the interval tunnel, inputting earthquake waves of bedrock, and calculating displacements and internal force responses of a metro tunnel under the action of a design earthquake and a rarely met earthquake; and 3, based on conventional dynamic analysis of a tunnel interval, and by considering the influence of a groundwater seepage effect on the interval tunnel, building a three-dimensional coupling model of water-soil-structure of the metro tunnel, and inputting the earthquake waves to the bedrock of the model in an x direction (a direction perpendicular to the tunnel interval) to obtain displacement and internal force response results of a three-dimensional seepage model.

The invention discloses a method for calculating underground water seepage flow based on an equipotential surface. The method comprising the following steps: (1.1) solving a seepage field, namely solving the seepage field by adopting the conventional finite element method and solving the water head values of the nodes of each unit; (1.2) determining the water head value of the equipotential surface, defining the water head value of the equipotential surface to be determined as h0, and forming the equipotential surface by the nodes with the same water head value; and (1.3) executing the step (1.3.1) on any unit or a unit No. ie in the seepage field, wherein the step (1.3.1) includes that the relations between the water head values of the nodes and h0 are judged. The method disclosed by the invention is a new method which solves the underground water seepage flow by utilizing a finite element and has the advantages that integral is directly carried out on the equipotential surface, the section through which water flows is vertical to the flow direction, no component interference is produced and calculation accuracy is high. The flow passing through the equipotential surface of the water head is in just one direction, thus avoiding that not only the direction of gradient of the water head but also the direction of an area vector are required to be determined in a middle section method.

The invention discloses a ground source heat pump system for force seepage. The system comprises a refrigerant subsystem for refrigerating / heating a user subsystem, and a geothermal heat exchange subsystem for transferring cold / heat to the refrigerant subsystem, wherein the geothermal heat exchange subsystem is provided with a heat exchange medium main supply pipe and a heat exchange medium main return pipe; and the geothermal heat exchange subsystem comprises an underground well water heat exchange circulating loop, a buried pipe heat exchange circulating loop and an underground water seepage circulating loop which are respectively connected with the heat exchange medium main supply pipe and the heat exchange medium main return pipe so as to form a circulating loop. By the ground source heat pump system for the force seepage, soil serves as a heat / cold source of a ground source heat pump, the underground water is fully utilized as the heat / cold source of the ground source heat pump, the cold / heat exchange capacities of the whole set of ground source heat pump system are improved, and aims of energy saving, high efficiency and stable operation are fulfilled.

The invention discloses a novel method of tailing dry pile process. The technical scheme is used for achieving dry pile field survey, tailing character analysis, treatment and analysis of field foundations, analysis of ground water transfusion fields, confirmation of dry pile field parameters and selection of soil engineering woven bag specification. Tailing pulp is injected in soil engineering woven bags by using tailings produced by a dressing plant, water in the tailing pulp flows out through the soil engineering woven bags (3), and coarse grain tailings are left in the bags and finally completely filling the bags. The soil engineering woven bags (3) filled with the tailings are piled from bottom to top according to staggered layers, a finally stockpiling tailing dry pile dam body (6) is a prismatoid structure with a narrow upper portion and a wide lower portion, a discharge and seepage pipeline (4) is arranged in the tailing dry pile dam body, and a slope face earthing protective layer (5) is arranged on the surface of the tailing dry pile dam body (6). The new method of the tailing dry pile process can not only solve the problem caused by the fact that tailing pond terrains for construction is lack nearby a mine, but also reduces long distance delivery cost of the tailings, guarantees normal production of the mine, and quickens building speed of the mine.

The invention discloses a calculation method for displacement and displacement time in a dynamic precipitation process of a pressure-bearing partially penetrating well or well group. According to the calculation method, a specific calculation method for the displacement and the displacement time in a process of changing an initial water level of an underground water level of the pressure-bearing partially penetrating well or well group to a target water level is established according to the basic theory and basic law of underground water seepage on the basis of the existing calculation formula for daily displacement when a stable water level is kept in the precipitation process of the pressure-bearing partially penetrating well or well group by carrying out integration on a precipitation area. According to the calculation method, the current situation that the calculation of the displacement at a water level changing stage is dependent on experiences for a long time when the pressure-bearing partially penetrating well or well group is designed nowadays is changed, and the calculation and dynamic control on the displacement in the whole precipitation process of the pressure-bearing partially penetrating well or well group in engineering construction are realized.

The invention provides an isolation processing method of polluted groundwater. The isolation processing method comprises the following steps: an anti-seepage curtain separated moderately-strong permeable layer is established through a vertical anti-seepage system and a horizontal drill hole or an adit, and a vertical and horizontal draining device and a monitoring system are arranged in a weak permeable layer to change and control the groundwater seepage path to control the groundwater leakage amount of the weak permeable layer, so that the requirement that the permeability coefficient reaches 10<-7> cm / s is met, and the influence of groundwater seepage pollution on the surrounding environment can be completely controlled. The isolation processing method combines a vertical anti-seepage technology, a horizontal and vertical groundwater draining and dynamic monitoring technology and a dynamic groundwater control technology, and thus has a high application value, and is especially suitable for seepage control of polluted groundwater in a tailings impoundment and other polluted groundwater.

The invention discloses a cement-bentonite vertical antifouling separating wall structure and a method. The cement-bentonite vertical antifouling separating wall structure comprises a cement-bentonitewall and material proportioning thereof, guide walls arranged on the two sides of the ground surface of the cement-bentonite wall and overlying structures on the top faces of the cement-bentonite wall and the guide walls and surrounding ground. The cement-bentonite wall penetrates to a relatively waterproof soil layer through a high-permeability rock soil layer from the ground surface, and a stable upstream water level face and a downstream water level face are formed on the high-permeability rock soil layer. The wall material has the beneficial effects of being high in water content, low inpermeability, high in deformation resistance, high in shear strength and the like. By means of the one-step construction method of excavating groove protection walls and directly forming the wall material from bentonite mud through hydrating and hardening, the method is simple, the working face is small, and the construction process of the vertical antifouling separating wall is simplified. The formed separating wall is used for concentrating pollution source underground water transfusion adjustment and control and pollutant diffusion prevention and control, and is especially suitable for theworking condition that overlying pressure or foundation lateral pressure is large.

The invention provides a prevention method for foundation pit retaining structure hole-punching and water-gushing caused by a blast of a stratum with a soft upper portion and a hard lower portion. The method comprises the steps that step 1, geological conditions in a construction site are determined; step 2, rocks above the depth of a blasted and excavated foundation pit are controlled; step 3, two-component polyurethane high polymer materials are injected to block off a vacant cave; step 4, seepage paths of underground water in the stratum are blocked off by combining the injected two-component polyurethane high polymer materials and a high-pressure rotary jet grouting pile; step 5, blasting parameters are optimized; and step 6, the blast of the next unit of blast zone is continued until the blast of all blast zones on the stratum is completed, and the construction of blast zones on the next stratum is conducted after the blasting construction of the stratum is completed. According to the prevention method, defects and deficiencies that under the condition of the foundation pit blasting construction, the blocking effect of the vacant cave is not obvious, and secondary water-gushing is prone to happening are overcome, and the effective prevention of the foundation pit retaining structure hole-punching and water-gushing caused by the blast of the stratum with the soft upper portion and the hard lower portion is achieved.

The invention discloses a deep karst leakage passage detection structure and method based on a drill rod inner pipe water level. The deep karst leakage passage detection structure comprises a drill hole (5). The drill hole (5) penetrates through an upper water-bearing layer (1) and a relative water-resisting layer (2) and reaches a lower water-bearing layer (3). A leakage passage (4) is located in the lower water-bearing layer (3). A drill rod (6) is arranged in the drill hole (5) and is of a hollow tubular structure. The inner pipe water level (8) is arranged in the drill rod (6). An outer pipe water level (9) is arranged in a cavity between the drill rod (6) and the inner wall of the drill hole (5). According to the deep karst leakage passage detection structure and method based on the drill rod inner pipe water level, the groundwater seepage field profile is drawn according to the drill rod inner pipe water level, and then the range of the leakage passage is delineated; and the drill hole inner pipe water level directly reflects the characteristics of the groundwater level on the lower portion of the drill hole and can more accurately reflect the underground space local groundwater flow characteristics and more directly embody the leakage passage information compared with a drill hole comprehensive water level.

The invention relates to the field of engineering model tests, and discloses a device for simulating a coupling effect of a foundation pit excavation stress field and an underground water seepage field. The device comprises a model case, a rainfall device, a water supply tank, two variable waterhead cases and a foundation pit excavation model box located in the model case, a displacement sensor isarranged on the foundation pit excavation model box, soil pressure sensor and water pressure sensors are arranged around the foundation pit excavation model box, a pressure measuring hole is formed in the model case, the pressure measuring hole is connected with a water pressure data collection device through the water pressure sensors, a drip hole is formed in the bottom of the rainfall device,a water pump is arranged in the water supply tank, the water pump is connected with the rainfall device through a rainfall conduit, and the bottom of the variable waterhead case is respectively connected with the water supply tank and the model case through a water supply tank connecting pipe and a model case connecting pipe. The device disclosed by the invention can simulate the mutual influenceof the stress field and the seepage field in an foundation pit excavation process under different underground water feeding conditions, and realizes the measurement of an underground water flow fieldand foundation pit settlement under different foundation pit excavation working conditions by the same experimental device.

The invention discloses a deep well cross-hole underground water flow rate, flow direction and geological parameter determining device. The determining device comprises a detector and a source injector, wherein the detector is connected with a data collection instrument, and the source injector is connected with a source-injecting control instrument. A method adopting the device comprises the following steps that the corresponding relationship between the conductivity and the concentration of a tracer material solution at different temperatures is determined; at least two drilling holes are selected; a target aquifer section is selected; the detector is lowered into the target aquifer section in a hole to test the conductivity background value and the temperature value; the source injectoris used to inject the tracer material solution into a source-injecting hole, and the detector is used to measure the water conductivity and the temperature in the detecting hole, so that obtain a distribution curve of the solubility of the tracer material solution with time is obtained; and a crossed test is carried out to calculate and obtain the seepage velocity and the flow direction of the underground water in the holes. The deep well cross-hole underground water flow rate, flow direction and geological parameter determining method can rapidly complete the determination of the undergroundwater flow rate, flow direction and related hydrogeological parametric of the underground water without radioactive pollution.