The invention relates to a large mechanical test system for a combined adjustable constraint concrete arch frame. The system comprises a monitoring system, a hollow cylindrical counter force structure, a hydraulic loading device and an auxiliary loading device, wherein the monitoring system is used for monitoring and collecting arch frame parameters and data. The inner cylindrical surface of the counter force structure is provided with multiple oil cylinder positioning holes, the hydraulic loading device is disposed in the oil cylinder positioning holes, the hydraulic loading device comprises a hydraulic oil cylinder arranged in the oil cylinder positioning holes, a force transmission dispersion device connected with the hydraulic oil cylinder and a control system, and the hydraulic oil cylinder achieves loading through contact of the force transmission dispersion device and an arch frame to be tested. By means of the system, a 1:1 mechanical test can be carried out on the constraint concrete arch frame and other conventional arch frames, and tests of arch frames of different sizes and shapes can be achieved.

Large mechanical test system for combined adjustable constraint concrete arch frame

The present invention relates to a steel arch centring deformation measurement device under a tunnel bias state and a construction method thereof. The device comprises a concrete pedestal used for embedding in an arch support, a bottom plate used for fixing the arch support, the arch support used for providing the test supporting, a pressure applying device used for providing the test pressure anda test device used for testing the stress and the deformation of the arch support. The bottom plate is arranged on the concrete pedestal, the arch support is fixedly connected with the concrete pedestal, the pressure applying device is embedded in the arch support, and the test end of the test device is arranged in a to-be-tested area of the arch support. The construction method comprises the steps of pouring a concrete bottom plate, a steel bottom plate, a steel arch centring and a concrete arch on the concrete pedestal, and installing a water sac in a concave cavity of the concrete arch; then attaching a pressure strain gauge and a dial indicator to the steel arch centring, leading the wire of the pressure strain gauge to a strain instrument, and real-timely monitoring the stress and the deformation of the arch centring under the bias state. The beneficial effects of the present invention are that the installation is convenient, the performances are reliable, and the measurement ofthe stress and the deformation of the steel arch centring under the bias loads is realized.

Steel arch centring deformation measurement device under tunnel bias state and construction method thereof

The invention relates to a tube piece loading testing device and method. The method comprises the following steps: exerting loading force to the outer surface of a testing tube piece by using a loading oil cylinder; according to set pressure, adjusting the loading force to be approximate to the set pressure; testing the distance between the loading oil cylinder and the outer surface of the testingtube piece so as to obtain distance data; when the testing tube piece is deformed, calculating deformation according to the tested distance data, and calculating a passive soil pressure value of thetesting tube piece at a set burying depth according to the deformation; adjusting the loading force according to the passive soil pressure value to be approximate to the passive soil pressure value according to the passive soil pressure value. In a testing process of the testing tube piece, passive soil pressure change caused by tube piece deformation is taken into account, real stress situationsof the tube piece in a soil body can be simulated, and the accuracy of mechanical property testing can be improved.

Tube piece loading testing device and method

Ringpresse zur mechanischen verformung von hohlraumquerschnitten

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Ringpresse zur mechanischen verformung von hohlraumquerschnitten

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Large mechanical test system for combined adjustable constraint concrete arch frame

Steel arch centring deformation measurement device under tunnel bias state and construction method thereof

Tube piece loading testing device and method