133 results about "Soil gas" patented technology

In general, the purpose of the probe system is to provide improved rapid field methods using re-designed direct push technology (DPT) and “push-pull testing” concepts to evaluate in situ chemical, biochemical, surfactant, adsorptive media, and leaching and fixation remediation technologies for hazardous subsurface contaminant(s). The probe system and methods described here when applied to a hazardous waste site being considered for in situ remediation of contaminants (organic or inorganic) by the listed treatment technologies will yield information that greatly reduces the uncertainty with regards to treatment effectiveness for the in situ soil, groundwater, and contaminant(s) conditions affecting dosage requirements and reaction rate(s) for various reactants. The probe system described here is multi-purpose in that it was designed: 1) to measure the relative permeability of the subsurface soil and groundwater to a liquid or gas ejectant, 2) to recover soil gas, soil, or groundwater samples for contaminant analyses, 3) to measure the chemical dosage and reaction, dissolution, adsorption, desorption, leaching, or fixation rate of a reactant such as a chemical or biochemical oxidant, metallic or bimetallic dehalogenating agent, surfactant or emulsifier solution, adsorbent media regenerant, leaching or fixation reagent that is injected into the matrix and withdrawn during a push-pull test, 4) to perform combinations of the above, 5) to measure the in situ adsorption capacity of adsorbent media and subsequently measure the effectiveness of regenerant(s) for the adsorbent media, and (6) to measure the effectiveness of a treated soil column for inorganic contaminant(s) leaching or fixation. In addition to being an in situ remedial alternatives evaluation tool, the probe system can be used as a reactant(s) delivery device after the specific remedial technology has been selected.

A probe for sampling a soil gas comprising a body having a cavity to which is connected an inlet and an outlet, and a gas permeable waterproof membrane wrapped around the body and sealing the cavity. The membrane allows the soil gas to flow across the membrane from the soil to the cavity. A method for measuring soil gas diffusivity comprising the step of circulating in a closed loop a carrier gas substantially at an atmospheric pressure through a diffusion gas sampling probe inserted in the soil and through a sensor used for the measurement of a concentration of at least a component of the soil gas.

A bioremediation method and system for destroying or reducing the level of contaminants in a contaminated subterranean body of water includes a plurality of spaced injection sites. The injection sites extend below ground and intersect a body of groundwater. Each of the plurality of injection sites are in communication with a supply of concentrated oxygen. The oxygen is conveyed by a delivery mechanism from the supply of oxygen to the injection points to naturally reduce the contaminants in the groundwater. The amount of oxygen delivered to the groundwater is maintained such that the amount of oxygen in the soil gas vapor is between 15% and 25%.

A method for determining a flux of a gas contained in a medium through a boundary of the medium comprises 1) measuring at least twice with a probe a concentration C of the gas over a time interval Δt and 2) determining the flux of the gas using the following mathematical equation: (I) where F is the gas flux, D is the diffusivity value and ΔC is a variation in the gas concentration during the time interval Δt. The probe is placed proximate the boundary. The probe has a gas inlet, a cavity, a gas concentration sensor and a membrane. Each element is in fluid communication with each other so that the gas flows from the gas inlet through the membrane and contacts the gas concentration sensor.F=(D∂C(z,t)∂z)z=0=DΔCπΔt(I)

The invention relates to a soil gas collector, in particular to the field of equipment for collecting and measuring a trace amount of soil gas. In the technical scheme for fulfilling the aim of the invention, a gas collector for collecting the soil gas consists of a cone frustum-shaped air chamber body without a bottom surface, a tubular connecting ring and a tubular fixed pipe which are connected with one another sequentially, wherein the lower port of the cone frustum-shaped air chamber body is directly connected with one end of the tubular connecting ring; the upper end orifice of the tubular fixed pipe is connected with the other end of the tubular connecting ring in a sleeved type and is embedded into an inclined plane rubber seal ring which is arranged on the outer wall of the tubular connecting ring so as to ensure air tightness; and the lower end orifice of the tubular fixed pipe has a tool edge shape so as to be conveniently and directly inserted into soil. The soil gas collector provided by the invention is extremely convenient to manufacture, use and maintain, has low cost, can be suitable for different soil environments such as mountains, plains, wetlands and the like through sample plot investigation, is extremely flexibly used, meets the requirements of field environments and has accurate acquired data.

The invention discloses an underground fluid laminated sampling device based on a U-shaped pipe technology. The underground fluid laminated sampling device comprises an underground fluid sample injection subsystem, a packer subsystem, a chaining subsystem, a ground sampling subsystem and a soil gas sampling subsystem, wherein the underground fluid sample injection subsystem comprises a driving pipe, a sample discharging pipe, a fluid storage container, a liquid phase check valve and a filtering element; the soil gas sampling subsystem comprises a gas phase check valve arranged at a set position; the gas phase check valve is connected with a manual pump through a pneumatic ball valve and a gas sampling bag. The invention further discloses an underground fluid laminated sampling method based on the U-shaped pipe technology. The underground fluid laminated sampling device is novel in structural design; multiple technical difficulties are overcome; compared with a product of the original technology, the underground fluid laminated sampling device has the advantages that the working performance, the application range and the system stability are greatly improved, has higher competitiveness and industrial leading superiority, can be widely applied, is good in engineering demand, and has good application prospect and commercial value.

The invention discloses a gas pushing type underground fluid stratified sampling device. The end port of a simple packer system is inserted into a pipe of a shaft system to perform embedding and fixedly riveted with the pipe through screws to form an integral cylindrical structure. The integral cylindrical structure is buried in the stratum through drilled holes, and a guide pipe in the integral cylindrical structure penetrates through small holes preserved in simple packers to be connected with a U-shaped pipe underground fluid sample feeding system. The guide pipe penetrates through the small hole preserved in a first simple packer to be connected with a gas phase filter and a gas phase check valve of a soil gas sampling system and penetrates through the first simple packer to be connected with a needle valve on the ground and a fluid sampling container. A gas pushing type ground fluid sampling system penetrates through the small hole preserved in the first simple packer to be connected with the U-shaped underground fluid sample feeding system. The gas pushing type underground fluid stratified sampling device is ingenious and novel in structure, low in cost, excellent in durability, strong in field adaptability, wide in application fields, strong in project demands and good in application prospect and commercial value.

The invention relates to a collector for collecting gas at different depths soil, which has a structure that the top end of a gas collecting tube is tip-shaped and closed with a plurality of pores arranged around the tip of the gas collecting tube which is connected with a connecting tube, the other end of the connecting tube is connected with a tee the other end of which is connected with the front end of an injector. The invention solves the defect existed in the prior soil gas collecting box and gas collecting bag. The invention, which can adapt different climate condition and meet the requirement of extensively collecting gas at different depths soil, reduces disturbance to soil, has the advantages of unnecessary of preembedding and additional power, simple structure, convenient operation, low cost, time saving and labor saving, and adaptability for simultaneously multi-point observation.

The invention discloses a simple deep soil gas sampler and a sampling method thereof. The simple deep soil gas sampler comprises a gas collecting pipe with a plurality of gas vents distributed on a peripheral wall and a gas guiding pipe, wherein one end of the gas collecting pipe is arranged as a sealing end while the other end is communicated with the gas guiding pipe; a three-way valve is arranged at the tail end of the gas guiding pipe; a waterproof gas-permeable membrane is adhered to an inner peripheral wall of the gas collecting pipe; the gas vents are divided into two sets and are linearly distributed on the pipe walls on the two opposite sides of the gas collecting pipe; and the straight lines of the gas vents are parallel to each other and are arrayed along the length direction of the gas collecting pipe. The sampler can be placed in different soil depths according to test requirements, the gases in the soil layers in different depths can be collected, and the gas concentration thereof can be conveniently determined, so that the distribution characteristics of the soil gases in different depths can be verified, and the concentration gradients and diffusion rates of the soil gases in different depths can be estimated. The sampler has an excellent sealing performance, the outside atmospheric environment almost has no interference to the sampler, the experimental result error is small, and the precision is high.

The invention discloses an active soil gas collecting device and collecting method. The active soil gas collecting device comprises a gas collecting bag, a gas sampling device, a filter, a nylon gas guiding pipe and a soil gas sucking and filtering device, wherein the gas sampling device is composed of a diaphragm pump, a regulating valve, a buffer, a flow meter, an electronic time-controlled circuit, an under-pressure indicating circuit, a power supply, a gas inlet and a gas outlet, wherein the soil gas sucking and filtering device consists of a fixed cylinder frame, a filter net, gravel, a nylon gas guiding pipe and a threaded pipe joint. When a soil gas is collected, the gas inlet pipe of the gas sampling device passes through the filter, and is connected with the nylon gas guiding pipe of the soil gas sucking and filtering device by virtue of a flexible through connection pipe, and the gas collecting bag is connected with the gas outlet pipe of the gas sampling device. The active soil gas collecting device can be used for collecting the soil gas in an existing monitoring cell, and can be distributed in soil of different depths according to a test requirement for collecting soil gases of different depth ranges, can be used for realizing long-term monitoring in the fixed-point soil, is simple in structure, high in soil gas collecting efficiency, and convenient and rapid to operate, and has a good effect.

The invention relates to a rice field-upland field rotation rice soil gas in-situ acquisition system and an acquisition method thereof, which belongs to the field of the gas acquisition technology and is specially used for the in-situ acquisition of the soil gas in the rice soil section plane under the condition of the rice field-upland field rotation. The invention comprises that: PVC pipes with the 40 mm inside diameter are chosen; total eight pores are uniformly distributed on the exchange interface of the pipe wall at the bottom of every gas cavity; all gas cavities are separated with PVC sheets which are perforated and allow a nylon tube gathering gas to pass through. A nylon slim tube passes through the upper part of the PVC sheets and is connected to a triple valve with a silicone tube. The acquisition method comprises detection of air tightness, installation, pre-equilibration and the system keeps airtight state; when in observation, a syringe directly gathers the needed voluminal gas. The invention can be used for gathering soil gas in the inundation state or in the drainage state, can gather in-situ gas with different section plane depth on the same locus, has easy operation and easily available materials, can be wildly applied to the rice field and wetland soil gas acquisition, and overcomes various kinds of defects in the prior art.

The invention relates to a device for in-situ environment remediation in an organic pollution site. The device comprises a water supply system, a water heating system, a flow valve, a superheated steam in-situ injection system, a monitoring well, a soil gas stripping and ground waste gas and wastewater processing system and the like. Water from the water supply system is fast heated by using the high-frequency water heating system and then enters the high-frequency superheated steam in-situ injection system through control of the flow valve, so that the superheated steam in-situ injection is realized; and meanwhile, the remediation effect is enhanced by using the soil gas stripping and ground waste gas and wastewater processing system, and a remediation effect is observed by the monitoring well. The device has the advantages that the problems that the heating speed is low, the steam injection temperature s low and the like of the traditional heating system are solved, organic pollutants which are high in boiling point and difficult to volatilize are efficiently removed, and meanwhile, energy can be saved by 50 percent.

The invention discloses a layered acquisition apparatus and monitoring method for soil gas, belonging to the technical field of soil monitoring. The layered acquisition apparatus comprises a well casing body; the well casing body comprises filtering sections and interlayer sections; sealing and separating plates are arranged in the parts, corresponding to the interlayer sections, of the well casing body; the interior of the well casing body is divided into a plurality of sampling chambers by the sealing and separating plates; the parts, corresponding to the filtering sections, of the wall of the well casing body are provided with sieve pores; the well casing body is also internally provided with a plurality of groups of gas sampling pipes having opened bottoms and located in different sampling chambers; and each group of gas sampling pipes comprises a gas inlet pipe and a gas outlet pipe which are correspondingly arranged. As the layered acquisition apparatus is placed in a wellhole, the acquisition apparatus can simultaneously acquire and monitor to-be-detected gas at different lengths and effectively guarantees gas sampling quality, so the accuracy of monitoring results of soil gas is guaranteed.

An intelligent soil gas-flux monitoring system and monitoring method are disclosed. The system includes a host box and a data collection system. The data collection system includes a gas chamber, a carbon dioxide sensor, a humidity sensor and a temperature sensor. The gas chamber includes an insect-proof net cover, a cylinder provided with an automatically controlled functional gate plate, and a flange. The cylinder is mounted between the insect-proof net cover and the flange. The carbon dioxide sensor is mounted on the flange at the bottom of the gas chamber. A measuring end of the carbon dioxide sensor protrudes into the gas chamber. A measuring end of the temperature sensor is in the environment surrounding the gas chamber. A measuring end of the humidity sensor is inserted into soil surrounding the gas chamber. The carbon dioxide sensor, the humidity sensor and the temperature sensor are connected to the host box. A problem that air flow rate measurement is required for CO2 flux calculation is avoided. Connection between the gas chamber and the host box with an air pipe is not needed, thus avoiding air blockage in an air pipe aeration process and an air pressure balance problem in the gas chamber. Sealed gas measurement and opened air change and circulation are adopted, and long-term continuous automatic monitoring can be achieved.

The invention relates to the technical field of contaminated land remediation, in particular to a movable in-situ heat strengthened soil gas phase extracting device and a movable in-situ heat strengthened soil gas phase extracting method, and aims to solve the technical problems of low efficiency, long remediation period and difficulty in thoroughly removing pollutants caused by adopting normal temperature gas phase extracting in a soil gas phase extracting technology in the prior art. The movable in-situ heat strengthened soil gas phase extracting device comprises a soil heat treatment system; the soil heat treatment system comprises a plurality of work units; each work unit comprises at least one extracting well and a plurality of heating wells; the heating wells are distributed along the extracting well; the plurality of the heating wells form a regular polygon structure; the heating wells are positioned at the vertexes of a regular polygon; the extracting well is positioned in the centre of the regular polygon. According to the technical scheme adopted by the invention, the remediation efficiency can be improved remarkably, the remediation period is short, and the pollutants are removed easily.

The invention relates to a transitory activated carbon adsorption radon sampling device and a method for exploring transitory activated carbon adsorption radon. The transitory activated carbon adsorption radon sampling device comprises a soil gas collector, an electric time suction pump and an activated carbon absorber, wherein the air inlet of the electric time suction pump is connected with an air outlet hole of the soil gas collector, and the air outlet of the electric time suction pump is connected with a duct of the air inlet of the activated carbon absorber. The method for exploring transitory activated carbon adsorption radon comprises that: measurement is carried out three days after on-site data acquisition so as to avoid the influence of thoron effectively; and a multi-fractal spatial interpolation is adopted to achieve excellent effect in maintaining and enhancing local abnormal information and contribute to the highlight of local weal abnormal information on blind uranium mineralization. The device can quickly collect free radon in soil and acquire the abnormal information on radon from a deep area, and contributes to the prediction and evaluation of a blind uranium resource.

The invention discloses a concentrated combustion type in-situ thermal desorption repairing device for a contaminated site. The concentrated combustion type in-situ thermal desorption repairing devicecomprises a combustion heat transferring and waste heat recovery unit, an extraction condensation and gas-liquid separation unit, an underground water flow control unit, a soil gas control unit, a waste gas treatment unit and a waste water treatment unit. The combustion heat transferring and waste heat recovery unit comprises an air heating furnace, a gas-gas heat exchanger, an air blower, an induced draft fan, an exhaust funnel and a heating well group. The extraction condensation and gas-liquid separation unit comprises an extraction well group, heat exchanging and condensation equipment, gas-liquid separation equipment, a demist tower and a vacuum pump. The underground water flow control unit is a waterproof curtain, the soil gas control unit is a concrete layer, the waste gas treatment unit comprises adsorption equipment and a draught fan, and the waste water treatment unit comprises an adjusting pool, a combination pool, sand filtering equipment, carbon filtering equipment and awater outlet pool. According to the concentrated combustion type in-situ thermal desorption repairing device for the contaminated site, defects of the prior art can be overcome, and a better repairingeffect is achieved.

The invention discloses a concentrated combustion type in-situ thermal desorption repairing method for a contaminated site. A concentrated combustion type in-situ thermal desorption repairing device is arranged and used for conducting repairing. The concentrated combustion type in-situ thermal desorption repairing device comprises a combustion heat transferring and waste heat recovery unit, an extraction condensation and gas-liquid separation unit, an underground water flow control unit, a soil gas control unit, a waste gas treatment unit and a waste water treatment unit. The combustion heat transferring and waste heat recovery unit comprises an air heating furnace, a gas-gas heat exchanger, an air blower, an induced draft fan, an exhaust funnel and a heating well group. The extraction condensation and gas-liquid separation unit comprises an extraction well group, heat exchanging and condensation equipment, gas-liquid separation equipment, a demist tower and a vacuum pump. The waste gas treatment unit comprises adsorption equipment and a draught fan, and the waste water treatment unit comprises an adjusting pool, a combination pool, sand filtering equipment, carbon filtering equipment and a water outlet pool. According to the concentrated combustion type in-situ thermal desorption repairing method for the contaminated site, defects of the prior art can be overcome, and a betterrepairing effect is achieved.

The invention relates to a box-type complete set soil and groundwater pollution two-phase extraction restoration device and an application. The box-type complete set soil and groundwater pollution two-phase extraction restoration device is integrated into a standard container and used for an organic pollution site. The box-type complete set soil and groundwater pollution two-phase extraction restoration device comprises an extraction and gas-liquid separation system, a tail gas humidity and temperature control system and a tail gas treatment system. Polluted underground water, pollutant-containing soil gas and a water insoluble free phase are extracted to the ground through an extraction well in a vacuum extraction mode, and then the separation of the gas, the water and the free phase is achieved through an inertia and gravity separation mode. The separated free phase is disposed in a recovered mode. The waste water is discharged after being subjected to ground facility treatment. The tail gas is exhausted through activated carbon adsorption treatment after humidity and temperature control. The box-type complete set soil and groundwater pollution two-phase extraction restoration device is convenient to transport and move and can be applied to a restoration project rapidly. The load of the tail gas treatment is significantly reduced and the efficiency of the activated carbon treatment is improved by installing the tail gas humidity and temperature control system. No fresh water is consumed in the operational process, and waste cold and heat of the system are fully used, so that the device is capable of saving energy and reducing emission.

The invention provides a method for monitoring soil gas by field surveying. The method comprises the following steps: selecting sites, which can be conveniently directionally drilled in the horizontal direction, of the periphery of a building or other obstacles; drilling by using a horizontal drilling tool; carrying out horizontal drilling under the building or the other obstacles, wherein a guiding device and a soil gas collection and transmission device are integrated on a drill bit at the front section of the drilling tool, and the guiding device integrated on the drill bit is connected with a receiving device on the ground in a wireless manner so as to ensure the position and depth of the underground drill bit; and when the drill bit is horizontally drilled into soil, adjusting the position of the drill bit in time if a condition that the drill bit deviates from an existing track occurs, so as to ensure that the drill bit reaches appointed depth and position in the soil.

The invention relates to a method for measuring gas leakage caused by drilling in the geological storage process of CO2. The method comprises the following main steps of: 1) before the CO2 is injected, performing background value sampling survey on the CO2 content and isotopic composition of soil at the peripheries of an injection well and a monitoring well, and finding out the content and source of the CO2 in the soil under the undisturbed condition; 2) analyzing the carbon isotope of the injected CO2, marking the feature of the isotope, and injecting into a deep salt water layer; and 3) performing sampling analysis on the content and isotope of the CO2 in the soil at positions which are different distances away from the injection well in different time periods, measuring whether the content of the CO2 in the soil is increased or not compared with that under the undisturbed condition, and measuring a relation between the content and CO2 injection. By the method, the CO2 content and isotopic composition of soil gas at the peripheries of the injection well and the monitoring well in the geological storage process of the CO2 can be monitored, so that the influence of the injection well and the monitoring well on the safety of the geological storage process of the CO2 is evaluated.

The invention relates to the technical field of risk management and control of contaminated sites, and discloses a biological barrier system and method for blocking a migration path of benzene seriesin a site to the atmosphere. The system covers a polluted area and sequentially comprises an aeration layer and a barrier layer from bottom to top, and the barrier layer is clean soil with biologicalactivity; the aeration layer comprises a filter material layer laid above the polluted area and an aeration pipe buried in the filter material layer; the soil gas monitoring system comprises a layeredmonitoring gas well and a soil gas collecting device; the soil gas collection device comprises a gas guide device buried in a layered monitoring gas well, wherein the air guide devices are communicated with an air inlet of the air extractor on the ground through guide pipes, the air guide devices are arranged at intervals in the depth direction of the layered monitoring gas well and buried in theair guide material layer, isolation layers are laid on the upper side and the lower side of the air guide material layer respectively, and the space between the isolation layers of the vertically adjacent air guide devices is filled with a connecting layer. The system is low in cost, capable of achieving in-situ blocking, free of secondary pollution, economical, environmentally friendly and goodin blocking effect.

A system and method for the accelerated decontamination of contaminated soil, vadose zone and / or groundwater is described. Contaminates are removed from soil and from the groundwater via heat injection through trenching or directionally drilled or horizontally drilled and installed delivery plumbing, pure oxygen injection through separate plumbing installed in the same manner as the plumbing used to deliver the heat, bioventing, sparging, and bioremediation, all through the oxygen delivery plumbing, and soil vapor extraction through vertical wells, all contained in one mobile treatment system. Contaminants are separated from the soil gas via filtration or oxidation. Residual contaminants in the vadose zone and / or the in the groundwater are subjected to volatilization by increased temperature via heat injection and / or oxidation via contaminant degrading microorganisms.

The invention discloses an unsaturated soil gas permeability coefficient measuring device in the field of environmental rock soil. The unsaturated soil gas permeability coefficient measuring device comprises a gas supply device, a testing device and a tail gas treatment device. The gas supply device comprises a gas storage bottle and an air compressor, the gas storage bottle is connected with a regulating valve, a pressure gauge and a mass flow controller, the air compressor is connected with the regulating valve, the pressure gauge and a glass rotor flow meter, and the gas storage bottle and the air compressor are connected to the cavity through a vent valve; and the testing device comprises a cylindrical soil sample chamber, a soil humidity temperature sensor, a soil mass pressure sensor and a digital electronic differential pressure sensor. The permeability coefficient of a gas in the soil mass can be simply and efficiently measured, the measurement result is more accurate, soil sample permeability and water retention performance modified materials can be rapidly screened, and measurement of a gas flow, a gas pressure difference, a soil internal temperature change and a water content change can be substituted into a calculation formula of the gas permeability coefficient.

Farmland soil hardening happens because an original structure of soil is destructed, surface layer organic matters are seriously destructed, soil particles are loosened and the soil is lack of moisture, as a result, the surface becomes hardened. Therefore, soil fertility is decreased continuously, soil gas permeability becomes worse, the nutrition is scarce, soil beneficial microorganisms are greatly reduced, and thus the growth of plants and crops are seriously affected. The invention relates to a preparation method and an application of a carbon based fertilizer formed by the steps of taking biochar as a substrate, combining the biochar with microbial flora and carrying out microbial composting, wherein the biochar is synthesized from straw as a raw material; with use of the method, the soil pH, the gas permeability and the soil beneficial bacteria concentration can be effectively adjusted, the soil fertility is improved, and thus cultivated land is conserved, the current situation of hardening is changed, and the ecological function of the soil is restored.

The invention discloses a device and a method for intelligent fertilization in the technical field of garden machinery. The device comprises a lower supporting base, the upper side of the lower supporting base is connected with an air hammer, the bottom of the lower supporting base is a hollow pipe, and the hollow pipe is communicated with one end of a pneumatic pipeline and one end of a liquid communicating pipeline. The hollow pipe is connected with one end of a lifting rod which is hollow. The lifting rod is arranged on a lifting driver. The other end of the lifting rod is detachably connected with a soil piercing device. The lifting rod can do linear lifting motion in the lifting driver. The lower part of the soil piercing device is in a conical shape. The soil piercing device is internally provided with a liquid communicating cavity which is communicated with an inner cavity of the lifting rod. The soil piercing device corresponding to the liquid communicating cavity is provided with at least an exhaust liquid applying hole. The device and the method improve soil gas permeability, and liquid medicine is easily and uniformly applied in plant root systems, being beneficial for growth of plants.

The invention relates to a soil remediation material and in particular to a timbered soil ecological remediation material and a preparation method thereof. The timbered soil ecological remediation material is prepared by the following raw material components in parts by weight: 220-260 parts of forestry and agricultural residues, 55-68 parts of sludge, 76-85 parts of animal livestock manure, 15-25 parts of a binder, and 0.5-1.5 parts of a microbial agent. The invention further provides the preparation method for the above timbered soil ecological remediation material. The timbered soil ecological remediation material is capable of maintaining soil fertility, enabling nitrogen phosphors potassium nutrients to be released from raw materials to soil, promoting soil microbial activity and promoting decomposition thereof, improving soil porosity, reducing soil bulk density, increasing soil gas permeability, and solving conditions that the soil fertility is lost and physical and chemical properties are poor and the like.

The invention provides a soil gas-liquid permeation test system for isotropic dry-wet chemical circulation. The system comprises an organic glass cover which covers a stainless steel base, a verticalloading rod passes through a top of the organic glass cover, and a piston is fixedly connected under the vertical loading rod. A reaction chamber exhaust hole is formed in the top of the organic glasscover. A stainless steel sample base is arranged, a sample base is installed on the stainless steel sample base to serve as a soil sample containing platform, an inner confining pressure control system is arranged to be matched with the vertical loading rod to simulate the pressure borne by a soil sample in a complex environment, and a suction control system is arranged to simulate the soil sample drying process. The method is simple and easy to implement, the deformation characteristics and gas-liquid permeation law evolution of soil under complex test conditions can be monitored in real time, researchers can be helped to understand permeation, mechanics and deformation evolution mechanisms of the soil in a complex field environment, and the development of engineering disposal methods and basic theories is effectively helped.

The invention discloses a multilayer soil gas sampler and a sampling method. The sampler comprises a plurality of layers of plastic protective shells, a cylindrical plastic pipeline, a plurality of waterproof breathable hoses and a plurality of airtight polyurethane pipes, wherein two adjacent layers of the plastic protective shells are in threaded connection, each plastic protective shell is provided with a cavity, the side wall of each plastic protective shell is provided with a plurality of small holes, and a partition plate is arranged between two adjacent layers; the cylindrical plastic pipeline is provided with a cavity, penetrates through the cavity of each layer of plastic protective shell, extends to the protective end cover of the plastic protective shell at the bottommost layerand is fixed; the plurality of waterproof breathable hoses are arranged in each layer of plastic protective shell and are wound on the outer side wall of the cylindrical plastic pipeline; the airtightpolyurethane pipes are arranged in the cavity of the cylindrical plastic pipeline in a penetrating mode, the bottom end of the airtight polyurethane pipe is communicated with one end of the waterproof breathable hose, and the top end of the airtight polyurethane pipe extends out of the top end of the cylindrical plastic pipeline and is provided with two-way valve. The sampler disclosed by the invention can be used for simultaneously collecting gas of multiple layers of soil and is convenient to use.