9 results about "Megascale engineering" patented technology

The present invention relates to a method for predicting the dynamic operating driving force of a pipeline straight-plate pig. The method comprises the following steps: obtaining basic parameters of the pipeline and the straight-plate pig, cyclically executing a driving force prediction process for all straight plates and accumulating the results; first, calculating the equivalent deflection angle, equivalent deflection angular velocity, and equivalent deflection angular acceleration; second, using the straight-plate deformation and deformation rate formulas to calculate the vertical deformation, vertical deformation rate, horizontal deformation, and horizontal deformation rate; and further selecting different calculation formulas for bending force and compression force according to different operating states. The bending force and compression force are then introduced into different driving force prediction formulas to calculate the straight-plate driving force. The instantaneous driving force of the straight-plate pig during dynamic operation is the driving force obtained by the final accumulation. Compared with the prior art, the present invention provides a simple and easy-to-use driving force prediction method. Only one auxiliary test is required. The input parameters can be simply calculated according to the process to achieve high computational efficiency, a wide range of applicable working conditions, and convenient large-scale engineering applications.

The invention discloses an efficient integral transformation cohesion fracture phase field simulation method and device. The method is applied to finite element simulation software and comprises the following steps: establishing a geometric model of a material to be simulated, and performing mesh generation on the geometric model to obtain a mesh model; determining a constitutive relation between strain and stress based on the energy degradation function, the elastic stiffness tensor of the to-be-simulated material and inherent mechanical parameters; determining a control equation based on the dissipative function functional, the energy storage function and the thermodynamic law; obtaining a residual equation according to the control equation and the constitutive relation; the residual equation is linearized, and the control equation is converted into a matrix control equation; applying a load condition on the outer boundary of the grid model, and solving to obtain a phase field distribution result by gradually loading a load step based on a matrix control equation; for each load step, it is determined to complete the iteration of the load step when convergence is reached. The method can be implemented in ABAQUS software, and is efficient and suitable for large-scale engineering application.

The invention relates to a concrete saturated hydraulic conductivity measuring device, and relates to the technical field of building material performance test.The concrete saturated hydraulic conductivity measuring device comprises a water supply tank, one side of the water supply tank is connected with a first measuring mechanism through a water supply mechanism, and the first measuring mechanism is arranged on a mounting plate; according to the invention, water is supplied to the first measuring mechanism through the water supply mechanism, and the first measuring mechanism and the second measuring mechanism are used for effective measurement; therefore, the problems that a traditional concrete saturated hydraulic conductivity measuring method can only measure one set of equipment and cannot test multiple sets of concrete saturated hydraulic conductivity at the same time, so that the measuring time is seriously influenced, the time is wasted, the automation degree and the testing efficiency are not high, and the testing cost is low in the prior art are effectively solved. The requirements of large-scale engineering test and scientific research work are difficult to meet.

The application discloses a butt welding joint modeling simulation method based on shell elements, comprising the following steps: based on microhardness testing, dividing a butt welding joint sample into a weld zone, a heat affected zone and a base material zone, and calibrating hardening model parameters for each zone; establishing a shell element model, assigning the hardening model parameters to corresponding shell elements, and correcting the flow stress of the shell elements in the weld zone by the excess height, wherein the correction coefficient K is the maximum load ratio of the reserved excess height sample and the milled excess height sample; defining a nonlinear damage accumulation fracture criterion for the shell elements, wherein the equivalent plastic failure strain is a function of the stress triaxiality; and introducing a grid dependency factor to correct the equivalent plastic failure strain. The application solves the problem of bearing capacity prediction distortion of the shell element model by microhardness partitioning and excess height correction, and realizes accurate prediction of the fracture behavior under a multi-stress state by the stress triaxiality related fracture criterion and grid regularization, and is suitable for large-scale engineering simulation such as vehicle collision.

The invention discloses a construction method for reinforcing a collapsible loess foundation based on grouting carbonization-vibration densification cooperation, which is realized through a stirring grouting-resonance densification cooperation reinforcing device, and comprises the following construction steps: S1, site pretreatment; s2, preparing slurry; s3, paying off and positioning; s4, slurry spraying, stirring and sinking; s5, stirring and air injection are stopped; s6, vibration, air injection and lifting; s7, a next pile position is replaced; and S8, pile hole backfilling. The collapsible loess reinforcement construction method is efficient, low-carbon and low-disturbance, during construction, powerful crushing of a loess structure, efficient mixing and permeation of slurry, soil and gas and full excitation of low-carbon reaction can be achieved, immediate compaction is achieved through vibration, the bearing capacity of a foundation is remarkably improved, collapsibility is eliminated, and the collapsible loess reinforcement construction method has the advantages of being simple in structure and convenient to use. The grouting carbonization-vibration densification synergistic reinforcement device used in the method is flexible to move, convenient to operate and wide in application range, can meet the application requirements of large-scale engineering, and has remarkable advantages in the aspects of resource recycling and carbon emission reduction.

The application discloses a kind of generalized theory numerical calculation method of the thermal conductivity of multiphase random mixing porous medium, the method includes the following steps: step 1, obtain the porosity of soil sample;Step 2, obtain the thermal conductivity of soil particles;Step 3, obtain the effective thermal conductivity of soil sample and the full state thermal conductivity surface under the porosity of soil sample;Step 4, obtain the volumetric water content and ice content of soil sample.The application innovatively proposes the strategy of using extreme state to calculate the thermal conductivity of soil particles, realizes the double check of parameters, eliminates the calculation error caused by the difference of soil mineral composition, and can obtain the effective thermal conductivity of soil body by calculation using conventional soil parameters.Using the method of the application, the thermal conductivity of soil body can be predicted with high precision only by using easily obtained physical parameters, and online monitoring and inversion analysis can be carried out.This is especially suitable for large-scale engineering projects and soil thermal response prediction, which greatly saves time and economic cost.

The utility model relates to the technical field of geotechnical engineering, in particular to a novel gabion frame structure. According to the technical scheme, the frame comprises a frame body and further comprises a plurality of frameworks used for being assembled into the frame body. The disassembling and assembling mechanism is arranged on the frameworks and used for enabling the frameworks to be transversely and vertically staggered and inserted into a frame body; and the connecting mechanism is arranged on the disassembling and assembling mechanism to enable the disassembling and assembling mechanism to be movably connected with the framework. According to the gabion frame structure, the framework, the dismounting and mounting mechanism, the connecting mechanism and other structures are matched, when the gabion frame structure needs to be used in a large-scale project, the construction period can be greatly shortened through the rapid and efficient splicing mode of the framework on the frame body, and therefore the construction efficiency is improved. Meanwhile, the upper protrusions and the side protrusions on the framework are checked regularly, corrosion, deformation and the like of parts are found, the parts can be replaced in time, overall disassembly and reconstruction are not needed, the maintenance cost is reduced, and the service life of the gabion is prolonged.

The invention relates to the technical field of foundation engineering, in particular to an automatic batch calculation method and system for pile foundation bearing capacity, and the method comprises the steps: inputting geological and pile foundation parameters in batches, and storing the geological and pile foundation parameters as structured data after automatic verification and formatting; original load data are integrated, and the most unfavorable load combination working condition of each pile is automatically generated; data and working conditions are read, a calculation model is automatically selected, single pile bearing capacity calculation and additional checking calculation are executed, and calculation of all pile foundations is completed through batch processing; and generating a visual chart and a standardized report. The system comprises a data input module, a database module, a multi-working-condition analysis module, a calculation engine module and a result output and visualization module. According to the method, automatic batch calculation can be achieved, the calculation time of thousands of piles is shortened to several minutes to hours, efficiency and design safety are improved, and the method is suitable for large-scale projects such as wind power projects and photovoltaic projects.

The present invention discloses a design method and system for a variable-section ultra-high-pressure plunger structure. First, the load and boundary conditions on the plunger are set. Then, by constructing the shape function of the variable-section plunger, the inner cavity structure of the variable-section plunger is determined. Secondly, based on finite element simulation calculations, the deformation distribution of the current plunger surface is obtained. Finally, the gradient descent method is used to iteratively optimize the parameters of the plunger inner cavity shape function until the termination condition is met, thereby obtaining the optimal variable-section ultra-high-pressure plunger structure. The variable-section ultra-high-pressure plunger structure and its design method proposed by the present invention, by changing the plunger inner cavity cross-sectional structure, match the plunger internal and external pressure difference with the cross-sectional stiffness, thereby significantly reducing the plunger surface deformation, taking into account both anti-deformation performance and lightweight requirements, and are easy to process, with prospects for large-scale engineering applications.