4 results about "Vertical Strain" patented technology

This invention provides a method and apparatus for determining the safety state of soil surrounding a foundation pit, applicable to the field of foundation pit engineering technology. The method includes: obtaining strain component information of multiple soil grid units after soil division based on deformation vector information of the soil surrounding the foundation pit; the strain component information includes horizontal strain components and vertical strain components characterizing the horizontal and vertical expansion and contraction deformation of each soil grid unit, respectively, and shear strain components characterizing the shape distortion of each soil grid unit; inputting the mobilization shear strain information obtained based on the horizontal strain components, vertical strain components, and shear strain components into a model indicating the relationship between soil stress information and strain information to obtain mobilization strength information of the soil under deformation state; determining the ratio between the mobilization strength information and the reference strength information as the strength mobilization rate information characterizing the soil's safety reserve, and converting the strength mobilization rate information to obtain the soil's safety state information.

The application provides a containment concrete temperature strain correction method, device, equipment and medium, and relates to the technical field of nuclear power containment concrete strain correction. The method comprises the following steps: collecting temperature information and strain information of the containment to form a sample set; selecting a preset period of sample sets to form an analysis sample set; based on the assumption that the temperature of the containment cylinder is linearly distributed, the circumferential strain and vertical strain caused by temperature change are obtained; the analysis sample set is fitted by least squares nonlinear fitting to obtain the thermal expansion coefficient temperature correction coefficient of the concrete; and the thermal expansion coefficient and temperature correction coefficient of the concrete obtained are substituted into the formula to obtain the circumferential strain and vertical strain caused by temperature change. The method can accurately evaluate the safety index of the containment, master the actual state of the containment, and optimize the maintenance cost and resources.

The invention discloses an on-line measurement method and device for the friction coefficient of a pantograph-catenary system contact pair, and relates to the technical field of electrified railway pantograph-catenary state monitoring and tribological testing, and the method comprises the steps: enabling a pantograph head sliding plate to be equivalent to an elastic beam structure with two fixed ends, and deducing a mechanical model of the pantograph head sliding plate; a vertical strain signal, a longitudinal strain signal and vibration acceleration signals at the two ends of the sliding plate in the running process of the sliding plate are synchronously collected through strain sensors and acceleration sensors which are arranged in a distributed mode; calculating a vertical acting force and a longitudinal friction force based on the vertical strain signal and the longitudinal strain signal, performing inertia force dynamic compensation by using the vibration acceleration signal, and restoring a real normal contact force and a real tangential friction force; and according to the Coulomb friction law, the dynamic friction coefficient of the pantograph-catenary system contact pair is obtained by calculating the ratio of the real tangential friction force to the real normal contact force. According to the invention, direct and on-line measurement of the pantograph-catenary friction coefficient can be realized, and the wear state of the sliding plate and the wire can be evaluated more scientifically.

The invention discloses a method for monitoring vertical deformation of a shaft wall of a vertical shaft in a manner that the whole body cooperates with the local body, and the method comprises the following steps: S1, forming a vertical microgroove along the full depth of the shaft wall, arranging a plurality of sensing optical fibers at equal intervals in the circumferential direction, and arranging monitoring points at equal intervals on each sensing optical fiber; s2, embedding the sensing optical fiber in the microgroove by using a filling material; s3, automatically collecting data of the sensing optical fiber by using a cabinet type densely distributed demodulator; s4, introducing a high-precision laser ranging system to carry out cooperative monitoring, and forming a plurality of detection groups in combination with sensing optical fibers; and S5, performing segmentation coefficient correction on the original monitoring data of the sensing optical fiber by using the deformation quantity measured by each monitoring group, thereby obtaining a real well wall full-depth strain field. According to the invention, high-precision, near-continuous and high-cost-performance well wall vertical strain monitoring can be realized, and a potential fracture area can be accurately positioned.