The invention provides a testing system simulating the ultimate dynamic bearing capacity of a cyclic load lower plate anchor. The testing system comprises a plate anchor model, a cross-shaped supporting frame, a cyclic loading device and a measuring device, wherein the cross-shaped supporting frame is used for limiting an anchor shank of the plate anchor model to move perpendicular to the seabed surface. The cyclic loading device is used for exerting cyclic loads on the anchor shank and comprises a transmission device, a cyclic load and displacement load converting device and a displacement correcting device, the transmission device is used for converting constant-speed rotation input by a motor into sine simulating reciprocating rotation, the cyclic load and displacement load converting device is used for converting the reciprocating rotation into superposition of appointed constant loads and sine simulating loads, and the displacement correcting device is used for adjusting the length of a rope according to the displacement of the plate anchor model so that it can be avoided that the amplitude of the cyclic loads is attenuated due to the displacement accumulation of the plate anchor model in multiple periods. The amplitude of the cyclic loads can be effectively controlled, pore water pressure of a soil body around the plate anchor in the circular drawing process is obtained, the destroying process of the plate anchor and the soil body around the plate anchor is directly observed, and the ultimate dynamic bearing capacity of the cyclic load lower plate anchor is reasonably evaluated.

Testing system simulating ultimate dynamic bearing capacity of cyclic load lower plate anchor

The invention provides a soil consolidation detector of using weight and air pressure combined loading and a detection method. The soil consolidation detector is suitable for the technical field of property detection of soil and especially suitable for remolded soil consolidation process testing and consolidation process testing of natural soil with relatively high moisture content. The soil consolidation detector comprises a reaction frame, a weight loading device, a weight and air pressure loading conversion device, a sensing measurement device, a consolidation container and an air source pressure controller; after weight loading and forming of a certain settlement amount, upper counter-force is formed through an adjusting nut and a conversion accessory; an air pressure loading device is started to push the consolidation container to ascend to gradually replace a weight load; air pressure is applied to pre-determined consolidation pressure; and the deformations of soil samples in the weight loading process and the air pressure loading process are automatically switched and observed and the soil consolidation quality is recorded and controlled through two groups of sensors on the sensing measurement device. The soil consolidation detector is relatively high in accuracy and convenient to operate; and soil which is uniform in property and high in strength and has different soil consolidation degrees can consolidated under a high load condition.

Soil consolidation detector of using weight and air pressure combined loading and detection method

The invention discloses a vertical well drainage consolidation soft foundation processing model test device and test method, the vertical well drainage consolidation soft foundation processing model test device is characterized in that: a drainage vertical well is arranged in the box body of a model test box, a soft soil foundation is filled between the box body and the vertical well, a pore pressure and temperature integrated sensor is arranged in the soft soil foundation, a horizontal sand cushion layer, a steel plate and a settlement gauge are arranged on the soft soil foundation, a force transmission rod is fixedly arranged on the steel plate, the lower end of a jack is connected with the force transmission rod, the upper lower end of the jack is movably connected with a loading lever, one end of the loading lever is hinged with a counterforce frame, and the other end of the loading lever is provided with a hook; the test method is as follows: fixing a PVC pipe and a U-shaped heat conduction pipe in the model test box, filling soft clay, burring the pore pressure and temperature integrated sensor, turning a computer type water circulation heater on, heating a soil sample with hot water in the U-shaped heat conduction pipe, grading and loading, and testing temperature, pore water pressure and ground surface settlement data in the test process; and the test method has the advantages of reasonable and reliable analysis of laws of changes and developments of temperature, pore pressure and settlement of the vertical well foundation.

Vertical well drainage consolidation soft foundation processing model test device and test method

The invention discloses a hydraulic control punching box type wave generation device and method.The hydraulic control punching box type wave generation device comprises a testing water channel, a hydraulic jack, a punching box, a transmission rod, a cam shaft and a high-speed camera.The hydraulic jack is adjusted, and the height of a wave maker is controller, so that the maximum underwater penetration of the punching box is adjusted, and the cam shaft connected with a rotating shaft of a motor is used for controlling the working stroke of the punching box.A groove-type guide rail is arranged on the rear side of the cylindrical punching box and tightly attached to the rear wall of the testing water channel.The punching box is designed in a cylindrical shape, waves are generated by collision between the punching box and the water surface, and waves generated by the arc structure of the punching box are closer to natural waves.The function of adjusting the wave height, the wave length and the period of the waves is achieved by comprehensively controlling the maximum underwater penetration, stroke and frequency of the punching box.The motor rotates to drive the punching box to move up and down to generate waves, the characteristics of the generated waves can be directly observed through the side wall of tempered glass, and the high-speed camera is fixed to the exterior of the water channel, so that wave information is obtained in real time, and the information is transmitted to an ocean wave spectrum display.

Hydraulic control punching box type wave generation device and method

The invention discloses a self-balance lever-type loading device and a using method thereof. The loading device comprises a left column, a right column, a base plate, a top plate, a fixed rack, a stepper gear box, a thread transmission slide bar, a lever rack, a roller, a displacement sensor, an LVDT displacement meter, a high-low level controller, a counterweight weight, a stepper motor, a dowel steel roller seat, a suspender roller seat, a locking pin bolt, a hanger, a loading weight, an integration controller, a dowel steel, a force transmission ball head, a pressure sensor, a loading plate, a pressure digital displaying instrument, and a computer. Through the displacement sensor and high-low level controller, which are invertedly arranged on the bottom of the roller, the transmission of the stepper motor is controlled by the computer, a vertical load is applied on a model, at the same time, the loaded lever is automatically leveled, and thus the vertical displacement of the loading plate is measured. The loading is realized by lifting the loading weight, moreover, static load with different lever ratios can be loaded, and the device is simple and practical, is suitable for tests of indoor models, and can satisfy the loading conditions in engineering practice.

Self-balance lever-type loading device and using method thereof

A flap type wave generator system in a high-gravity field comprises a centrifugal machine system, a motor, a belt, a speed changer, a force conversion device, a flap device and a wave eliminating device, wherein a model box is arranged in a hanging basket of the centrifugal machine system, the wave generator system is arranged on the model box, the force conversion system is fixed on the upper surface of a top cover of the model box, the axial direction of the motor, the axial direction of a transmission shaft and the axial direction of the speed changer are perpendicular to the top cover of the model box, and the motor, the transmission shaft and the speed changer are arranged in parallel; the output of the motor passes through the transmission shaft and then is output by the speed changer through speed change to the input end of the force conversion device, the force conversion device converts the rotating motion output by the motor into the linear reciprocating motion which is then output to the second end of a flap, the flap device comprises the flap, a fixing plate and a support, the support is fixed on a base plate of the model box, the first end of the flap is connected with the fixing plate in a rotary mode, and the second end of the flap is connected with the output end of the force conversion device in a rotary mode. The mechanical driving flap type wave generator has the advantages of being high in control precision and good in wave generation frequency characteristic.

Flap type wave generator system in high-gravity field

The invention discloses a centrifugal simulation system for the freeze thawing deformation of a water conveyance canal in a salty-cold region The centrifugal simulation system consists of a centrifugal machine, a model box, a water circulation refrigerating plant and a temperature controller, wherein the model box consists of an outer box, an inner box and an interlayer filling material and is used for setting a canal model; the water circulation refrigerating plant consists of multiple semiconductor refrigerating sheets connected with one another in series and a water cooling device; the water cooling device comprises a water pipe, a water pump and a water tank; the temperature controller is used for setting and monitoring the ambient temperature in the model box so as to simulate a real site environment temperature; the model box is arranged in a basket of the centrifugal machine; the semiconductor refrigerating sheets are fixed on the top in the model box; the water circulation cooling device is arranged on a rotating arm of the centrifugal machine; refrigeration plates of the semiconductor refrigerating sheets downwards absorb heat of the canal model; heat dissipation plates of the semiconductor refrigerating sheets dissipate heat through the water circulation cooling device The technical problems of simulation and testing in the frost heaving-thaw collapse process of the water conveyance canal under the action of a hypergravity field are solved

Centrifugal simulation system for freeze thawing deformation of water conveyance canal in salty-cold region

The invention discloses a centrifugal model foundation soil layer consolidometer which consists of a leveling device, a lever loading device, a guide force transmission device, a consolidation container and a framework, wherein the leveling device consists of a handwheel and a worm wheel and worm mechanism; the lever loading device comprises a horizontal lever, a connection device and a weight hanging disk; the connection device comprises a transverse shaft and eccentric transmission shafts arranged at two ends of the transverse shaft, wherein the eccentric transmission shafts consist of main body shafts and eccentric shafts; an eccentric hole is formed in one end of each main body shaft, and each eccentric shaft is arranged at the other end of the corresponding main body shaft; a turbine shaft is vertically arranged; the handwheel drives a worm through a gear to drive the turbine shaft to move up and down; the connection device and the weight hanging disk are respectively connected with two ends of the horizontal lever; the transverse shaft is horizontally arranged and is perpendicular and fixedly connected with the horizontal lever; the end parts of the transverse shaft are fixedly connected with the eccentric transmission shafts through the eccentric holes; the bottom of the turbine shaft is connected with the transverse shaft in a rotatable manner; the eccentric shafts are connected with a pressurization head through rolling bearings; the bottom end of the pressurization head is in contact with the top end of a force transmission rod; the lower end of the force transmission rod is fixedly connected with a pressurization plate in the consolidation container.

Centrifugal model foundation soil layer consolidometer

A centrifugal model test lateral static force loading device comprises a permanent-magnet low-speed synchronous motor, a gear case, a worm gear, and a load sensor; the permanent-magnet low-speed synchronous motor is vertically disposed on the gear case; the output of the permanent-magnet low-speed synchronous motor is outputted to the worm gear in a parallel manner after deceleration by gears in the gear case; a turbine shaft is disposed horizontally; the load sensor is disposed at the end of the turbine shaft in a horizontal direction. The device of the invention can simulate a large lateral static force amplitude, and can continuously and stably apply a lateral load; a lateral load-displacement curve can be obtained during loading; the device facilitates the arrangement of a geotechnical centrifugal model; the operation of the invention is quite safe, and accurate control can be realized.

Centrifugal model test lateral static force loading device and testing method

A force converting system of a rocker panel type wave maker in a high gravity field is composed of a model tank, a servo motor, a speed changing box, a rotating disc, a connecting rod and a rocker panel device. The servo motor, a transmission shaft and the speed changing box are fixed to the upper surface of a top cover of the model tank, an output shaft of the servo motor is connected to the upper end of the transmission shaft through a synchronous belt wheel, the lower portion of the transmission shaft is provided with the speed changing box, the lower end of the transmission shaft is provided with the rotating disc, a center hole of the rotating disc is in rigidity connection with the output end of the transmission shaft, the rotating disc is provided with a plurality of eccentric holes, the distances between the eccentric holes and the circle center are different, the connecting rod is horizontally arranged, the first end of the connecting rod is rotationally connected with one eccentric hole in the rotating disc, the second end of the connecting rod is rotationally connected with the first end of a rocker panel, and the first end of the rocker panel penetrates through a sliding groove in the top cover of the model tank to be rotationally connected with the connecting rod. The rotating force output by the motor is converted into force circularly moving along the straight line in the both directions on a centrifugal machine to drive the rocker panel, and the designed wave load is accurately simulated and controlled.

Gu Xingwen

Papers

Flap type wave generator system in high-gravity field

Centrifugal simulation system for freeze thawing deformation of water conveyance canal in salty-cold region

Centrifugal model foundation soil layer consolidometer

Centrifugal model test lateral static force loading device and testing method

Force converting system of rocker panel type wave maker in high gravity field