The invention provides an SCCRF (structural cross constraint random field) generation method and system. The method utilizes parameters of actual sampling data as multi-dimensional constraint data, and generates a new random field by considering the cross correlation between rock and soil spatial structure and different variables. According to the method, the actual observation data is taken as the known point position condition data, and unknown point data is generated by considering the crossover among a plurality of variables through synergistic Kriging. The hard data is constrained by thesoft data while the original regionalized variable random field is generated, and then the random field considering the correlation among the regionalized variables is obtained. At the same time, thecomplete random field and the co-Kriging method are combined to consider the directional complex anisotropic spatial variation structure, and then the structural cross constraint random field is generated. The generation method reproduces the second-order statistical characteristics of the research area parameters, considers the random field simulation of the complex anisotropic spatial variationstructure type, and improves the assignment precision.

SCCRF (structural cross constraint random field) generation method and system

The invention provides a fractal dimension analysis method for determining a rock structural surface laboratory reasonable size. The fractal dimension is applied to representing the rock structural surface roughness, the size effect rule of the rock structural surface roughness is analyzed, a function relational expression is given, and the novel method for determining the rock structural surface laboratory reasonable size through the function curve slope dip angle is put forward. The method overcomes the defect of the one-sidedness caused when the structural surface size effect is researched by calculating the rock structural surface two-dimensional section line fractal dimension, and meanwhile the theoretical foundation is provided for determining the rock structural surface reasonable size inside a laboratory.

Fractal dimension analysis method for determining rock structural surface laboratory reasonable size

The invention discloses a generation method of soil parameter six-node triangular random field unit samples. The method includes the steps of firstly, regarding two-dimensional spatial soil parametersas two-dimensional continuous stable random fields, and performing six-node triangular grid discrete and unit numbering; secondly, determining six-node triangular local average random field covariance; determining a feature vector matrix P according to an assembled overall random field covariance matrix A; fourthly, building a first random vector beta; fifthly, determining a second random vectoralpha; sixthly, generating a group of local average random field samples; seventhly, generating multiple groups of local average random field samples. The method has the advantages that six-node triangular random field grids and six-node triangular finite element grids can use the same grids, the acquired local average random field samples can be directly applied to random finite element calculation, unit number correspondence relation is clear, calculation accuracy, easiness in programming and high universality are achieved, and the samples are widely applicable to the discrete analysis of random finite element random fields.

Generating method of soil parameter six-node triangular random field unit samples

The invention relates to a calculation method for a rock structure surface multi-fractal parameter. The method is used for quantifying rock structure surface roughness. The method comprises the steps of obtaining three-dimensional shape data of a rock test piece structure surface; dividing the structure surface into a plurality of small grids through utilization of a projection covering method, generating random numbers, selecting different division schemes for triangles in the small grids according to the parity of the random numbers, calculating an area of each small grid, the total area of the structure surface, and the roughness probability and measurement of the structure surface of each small grid; carrying out fitting through a least square method to obtain multi-fractal spectrum parameters corresponding to different ranging degree, and calculating the generalized fractal dimension and the multi-fractal parameter; carrying out repeated sampling, enabling sampling results to satisfy a 3 sigma rule, providing a structure surface multi-fractal parameter probability density distribution function, and taking a mean value of the sampling results as a precise calculation value for searching the structure surface multi-fractal parameter.

Calculation method for rock structure surface multi-fractal parameter

A gradient-type graphene smart-concrete-based corrosion detection apparatus and method. A aggregate-shaped and gradient-type smart-concrete-based corrosion detection apparatus made by graphene has the features of small volume, good compatibility with concrete, and high sensitivity. The manufacturing method for said apparatus comprises: first dissolving graphene in water under the action of a surfactant, then formulating a graphene-based smart mortar according to a certain formulation ratio, and pouring same by layers according to gradients to form an aggregate-type concrete corrosion detection apparatus, wherein electrodes, which may be mesh-shaped, rod-shaped or point-shaped electrodes need to be placed first, and then calibration is performed after the smart mortar is solidified and maintained for 28 days. Said apparatus is placed into concrete of a building structure, the electrodes are led out by means of a wire, and the change of the resistance between the electrodes is measured to represent the corrosion degree and health state of the concrete at that site.

Gradient-type graphene smart-concrete-based corrosion detection apparatus and method

The present invention discloses a generation method of three-dimensional local average random field samples of geotechnical parameters The generation method comprises the steps: (1) regarding geotechnical parameters as a three-dimensional continuous and stationary random field, and performing random field mesh discretization and unit numbering; (2) determining a local average random field covariance; (3) determining a lower triangular matrix L according to an assembled overall random field covariance matrix; (4) constructing a random vector beta; (5) determining a random vector alpha; (6) generating a set of local average random field samples; and (7) generating multiple sets of local average random field samples In this method, a tetrahedral random field mesh and a tetrahedral finite element mesh may be the same mesh; the obtained local average random field samples can be directly applied to random finite element calculation; the correspondence of unit numbers is clear; the calculation is accurate; programming is easy; the universality is high; and the method can be widely applied to discretization analysis of the random finite element parameter random field

Generation method of three-dimensional local average random field samples of geotechnical parameters

The invention discloses a gravitational field simulation apparatus and method for an open magnetogravity model testing system. The gravitational field simulation apparatus comprises a uniform magnetic field coil assembly, a gradient magnetic field coil assembly, magnetic-conductive encased iron, uniform magnetic field compensating rings and a radial magnetic field compensating coil assembly, wherein the uniform magnetic field coil assembly is composed of a main coil and a compensating coil assembly which coaxially sleeve the magnetic-conductive encased iron, the gradient magnetic field coil assembly is composed of two same gradient coil assemblies which are coaxially and symmetrically installed at positions respectively close to a transmitting terminal A and a transmitting terminal B of the magnetic-conductive encased iron, the two uniform magnetic field compensating rings respectively sleeves the exteriors of the transmitting terminal A and the transmitting terminal B of the magnetic-conductive encased iron, and the radial magnetic field compensating coil assembly is a circular structure defined by four saddle-shaped radial magnetic field compensating coils and coaxially sleeves the exterior of testing space. The gravitational field simulation apparatus and method provided by the invention effectively overcome the technical problems of low simulated gravitational field strength, great radial errors and enclosure of testing space of conventional magnetogravity simulation apparatuses and greatly promote development of magnetogravity model testing.

Gravitational field simulation apparatus and method for open magnetogravity model testing system

The invention provides a strength gradient material and a preparation and test method thereof, belongs to preparation and test methods of similar strength materials of geotechnical engineering. The strength gradient material is prepared by uniformly mixing a base material and an auxiliary material, and continuously stirring the mixture to be solidified, wherein the base material is prepared by mixing and stirring sulfate cement clinker, bentonite and deionized water; the auxiliary material is prepared by stirring anhydrite, lime, lithium hydroxide, a water-retaining agent and deionized water; the water cement ratio of the base material and the auxiliary material both is 2-4, and the maintenance time is 20-60 min. The preparation and test method of the strength gradient material comprises the steps: controlling the maintenance time and the water cement ratio and pouring the materials in layers till a predicted strength gradient is formed; determining material strength, the water cement ratio and the maintenance time, controlling the water cement ratio and the maintenance time, pouring the materials in layers till a preset height is achieved, and performing the whole maintenance under constant-temperature and constant-humidity conditions; after the maintenance is finished, arranging micro pore pressure sensors on the surface of a sample, and combining with a digital photographic technique to perform an uniaxial test. By utilizing the strength gradient material, the deformation field characteristics of a gradient material and the scale characteristics of a failure mechanism can be achieved, and transfusion-deformation coupling measurement in a gradient material deformation process is finished.

Strength gradient material and preparation and test method thereof

The invention discloses a static cone penetration physical model testing device in the magnetic simulating gravity field environment and a method thereof. according to the device, a loading rod is used to elongate the distance from a magnetic simulating gravity field to a pressure meter and a displacement meter and reduce the influence of the magnetic simulating gravity field on the pressure meterand the displacement meter; and the distance between a three-phase asynchronous motor and the magnetic simulating gravity field is also elongated, and the influence of the three-phase asynchronous motor on the magnetic simulating gravity field is reduced. By the device of the invention, static cone penetration physical model tests of various geotechnical materials such as cohesive soil, cohesionless soil and the like in different gravity field environments can be conducted, and various grain size, grading and loading rate conditions can be simulated. By the device of the invention, the influence of the testing magnetic field environment on sensing elements such as the pressure meter, etc. can be effectively avoided. The testing device also fully considers the interference effect on the magnetic field, thus guaranteeing precision of the magnetic simulating gravity field and reliability of the testing result.

Static cone penetration physical model testing device in magnetic simulating gravity field environment and method thereof

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Generation method of three-dimensional local average random field samples of geotechnical parameters

Gravitational field simulation apparatus and method for open magnetogravity model testing system

Strength gradient material and preparation and test method thereof

Static cone penetration physical model testing device in magnetic simulating gravity field environment and method thereof