The utility model discloses a modular soil body permeability tester comprising a soil body seepage system, a seepage working condition control system and a data acquisition system. Different modular structural members are assembled to simulate various test working conditions, thus the seepage characteristics of a soil body are researched economically and efficiently. The modular structural member comprises a top box, an organic glass cylinder, a bottom box, an artificial rainfall module, a reverse filtering part and the like; the modular structural member is convenient in mounting and dismounting and beneficial to the preparation of a sample; and the water in the seepage process can be recycled, so that the water source can be saved. In addition, all modular structural members can be freely selected and arranged according to different research purposes, so that the testing equipment has high expandability, and furthermore, various testing requirements are met. According to the utility model, the modular design concept is adopted, the testing equipment has the advantages of diversity, economy, high efficiency, expandability and the like, and the measured test parameters are more accurate.

Modular soil body permeability tester

The invention relates to an obstruction testing method for soil permeability under constant flow velocity. An apparatus for obstruction testing of soil permeability under constant flow velocity is arranged and comprises a cylindrical permeation column, differential pressure sensors, a constant flow pump, a magnetic stirrer, a laser particle analyzer, an inflow water reservoir vessel, valves, pressure-resistant flexible pipes, an effluent water collection container, etc. Obstruction particles are added into the inflow water reservoir vessel and uniformly stirred by using the magnetic stirrer, so an obstruction sample is allowed to be suspended in an infiltration liquid; the constant flow pump is used for maintaining constant seepage flow and continuously supplying water; and the differential pressure sensors are used for replacing traditional piezometric tube in measurement of seepage pressure at a plurality of different seepage sections and automatically and continuously acquiring testing data. The method visually reflects rules that how the particle sizes and quantity of the obstruction particles and seepage time change seepage pressure and permeability of the sample, can change the particle size of the obstruction sample and the content of the obstruction sample in the infiltration liquid, and is capable of carrying out continuous obstruction testing of permeability under different flow velocities so as to research influence of particle migration on the permeability of soil.

Obstruction testing method for soil permeability under constant flow velocity

Test device and test method for penetration clogging of soil

Penetrating-stretching type pore water pressure measurement device and measurement method thereof

The utility model provides a coal sample water injection device for simulating high-pressure water injection on mine site in a laboratory, wherein a water injection pump is connected with the upper part of an experimental box body, the experimental box body is a cylindrical cavity and has a hollow housing, an oil cavity filled with hydraulic oil is arranged in the hollow structure of the housing, pressure of hydraulic oil in the oil cavity is controlled by a pressurizer, seven test sample sleeves are evenly distributed in the cavity of the experimental box body, the cavity is internally filled with loading foam capsules between the test sample sleeves and between the test sample sleeves and the inner wall of the housing, a water seepage disc is arranged on the upper end of the test sample sleeve, and a drainage disc is arranged at the bottom of each test sample sleeve. The coal sample water injection device is novel and unique, simple and reliable in structure, feasible in technology, and convenient to machine, the moisture rate of experimental test samples is reduced to most practical situation by adopting the device. The coal sample water injection device has obvious correction function on the experiment results.

Coal sample water injection device for simulating high-pressure water injection at coal mine site in laboratory

The utility model relates to a seepage siltation test device for earth. A water-outlet base drum, a material containing drum and a water inlet top drum are installed on a test tower support. A hole water pressure detecting hole is arranged on the lateral face of the material containing drum, a hole water pressure sensor is installed in the hole and is connected with a computer, a three-way valve structure formed by a siltation test material container pipe, a return water control valve, a feeding inlet valve and a water delivery valve is installed at the upper end of the water inlet top drum, and a high pressure water tank is formed by a water supplying pipe and a water pump in a water collecting tank. The test device for seepage siltation of the earth feeds siltation test materials under the condition of continuous water supply, achieves the continuous process of a seepage siltation test, changes a measurement method of an existing pressure measurement pipe, utilizes multi-section seepage electronic monitoring recording and data processing, can visually reflect interrelationship between particle size, hole water pressure and seepage flow, solves the problem of influence on observation of permeability of loose media under the condition of siltation effect, and provides reliable scientific data for large engineering design.

Seepage siltation test device for earth

The utility model relates to a penetrating-stretching type pore water pressure measuring device and a measuring method A protruding segment of a conical penetrating head is inserted into a strainer pipe and connected with the strainer pipe through threads or pins, a sleeve is mounted outside the strainer pipe, matched with the strainer pipe in a sliding mode and pressed tightly on a shoulder of the conical penetrating head through a gasket, and the bottom end of a duct is arranged at the upper end of the sleeve through threads or is embedded at the upper end According to the penetrating-stretching type pore water pressure measuring device and a measuring method, the problems of the complicated pore water pressure measuring and the indirect data in saturation soft soil distributing areas is solved, the device is particularly applicable to the monitoring and measuring of fine grained soil layer pore water pressure of the causes of delta facies, oxbow lake facies, lake facies, lagoon facies, swamp facies and the like of quaternary rivers, the measuring of phreatic water level and perched water level of ground water and confined water head, and the water quality stratification monitoring and sampling of the groundwater environment Compared with the prior art, the device is simple in structure, low in cost and practical and convenient; the measuring method is simple to implement, convenient to operate and reliable in data

Chong Liu

Papers

Test device and test method for penetration clogging of soil

Penetrating-stretching type pore water pressure measurement device and measurement method thereof

Seepage siltation test device for earth

Penetrating-stretching type pore water pressure measuring device