A dynamic pull-out test device for anchor rods used in soil

Abstract

The invention discloses a dynamic drawing test device of an anchor rod for soil. The device comprises a test box. An installation space with an opened top is formed in the test box. A soil loading device is arranged in the installation space. A soil accommodation space is formed in the soil loading device. An anchor rod dynamic drawing device for dynamically drawing an anchor rod and a monitoringdevice for monitoring are arranged above the soil loading device. The soil loading system is suitable for soil, even if sliding type loading plates are relatively displaced, the soil loading device can normally work, and the load is transmitted to soil to make the soil be in a fixed stress state. The anchor rod is dynamically drawn by an actuator, in the loading mode, a load time travel curve is inputted into the actuator, and various dynamic and static loads are applied on the anchor rod. Under the assistance of sensors distributed in the system, the provided device is used to research the anchorage performance and dynamic response of an anchor rod in soil with different stress states during the process of dynamic drawing.

Description

technical field [0001] The invention belongs to the field of rock and soil anchoring engineering, and in particular relates to a dynamic pulling test device for anchor rods used in soil. Background technique [0002] As an economical and effective reinforcement method, bolt support is widely used in underground engineering, slope engineering, structural anti-floating engineering and deep foundation pit engineering. Soil anchoring relies on the shear strength of the anchor rod buried in the ground and the surrounding soil to transmit the tensile force of the structure or reinforce the ground itself to ensure the stability of the structure and soil. The successful anchoring of the bolt to the ground depends on the resistance of the ground to the pull-out of the bolt. The resistance is not only related to the type of soil, but also related to the stress state of the soil. [0003] With the continuous expansion of the application range of anchor bolts, the influence of seismic ...

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Problems solved by technology

In order to solve problem 1, the publication number is CN103698215A, and the publication date is the Chinese patent anchor cable pulling test device on April 02, 2014. The preloading device is used to pressurize the soil, but the device exerts two forces on the soil. The magnitude of the principal stress is the same, which is inconsistent with the actual situation

The publication number is CN103398901A, and the publication date is November 20, 2013. The Chinese patent is an indoor pull-out test device for anchor rods. The sample is loaded by a jack, so that the principal stress of the sample can be different, depending on the elastic modulus of the soil. Compared with the rock, the soil sample will be greatly compressed when the device applies a load to the soil sample, and the loading device is difficult to work normally, and the device is difficult to apply to the soil

In order to solve the problem 2, the Chinese Patent Anchoring Body Dynamic Tensile Experimental Device and Experimental Method with Publication No. 105510158A and Publication Date of April 20, 2016 uses a heavy hammer-lever device to convert and amplify the impact load of the free fall of the heavy hammer For the impact load on the anchor rod, but the device can only apply impact load to the anchor rod, and there are many inconveniences when applying repeated loads

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