A dynamic pull-out test device and test method for anchor rods under the action of seismic waves
A test method and technology of pull-out test, applied in the field of geotechnical anchoring engineering, can solve problems such as the stress state of difficult rock and soil
Active Publication Date: 2020-07-31
HEBEI INSTITUTE OF ARCHITECTURE AND CIVIL ENGINEERING
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Problems solved by technology
The publication number is CN103698215A, and the publication date is April 02, 2014. The Chinese patent anchor cable pull-out test device uses a preloading device to pressurize the rock and soil body; the publication number is CN103398901A, and the publication date is November 22, 2013. The Chinese patent of an indoor pull-out test device for anchor rods, which can make the principal stress of the samples different in size by loading the samples through the jack, but the above-mentioned patents are difficult to keep the rock and soil in the stress state under the seismic wave load
Publication number is 105510158A, and the publication date is April 20, 2016. The Chinese patent anchor dynamic tensile test device and test method can apply impact load to the anchor rod through the weight-lever device, but the device is not suitable for complex dynamic loads. there are limitations
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Embodiment 1
[0080] The test box 8 is poured with concrete, and the positioning box 9 is poured at the corner of the test box 8 . The rock and soil sample 11 is placed in the positioning box 9 .
[0081] Arrange strain gauges 18 along the shaft of the test anchor 13, and perform waterproof treatment on it, place the test anchor 13 in the circular through hole 9, pour cement, and maintain to the specified strength. An acceleration sensor 17 is placed on the exposed part of the anchor rod 13 .
[0082] Fix the support plate 1 on the support column 2 at a suitable height, connect the actuator 6 fixedly, and provide it with a reaction force.
[0083] The end of the test anchor rod 13 is used as the actuator 6 to apply a load, and a displacement sensor 17 is arranged on the anchor rod 13 . The sample 11 and the anchor rod are placed in different stress states, and the data of the displacement sensor 16 and the acceleration sensor 17 are read at the same time to monitor the anchor rod.
[008...
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The invention discloses a testing device and a testing method of anchor rod dynamic-pulling under the action of seismic waves. The testing device thereof includes a testing box. A positioning box usedfor positioning a testing sample is disposed in the testing box. A seismic-wave loading device is disposed in the testing box, and applies bidirectional seismic wave loads to the testing sample. An anchor rod dynamic-pulling device is disposed at an upper open end of the testing box. The testing method thereof includes the following steps: installing the testing box and the positioning box; placing the testing sample; installing the seismic-wave loading device; debugging the seismic-wave loading device; installing a monitoring device on an anchor rod; installing the anchor rod dynamic-pullingdevice; and opening a vibration exciter I, a vibration exciter II and an actuator. According to the device and the method, the vibration exciters are employed to carry out application of the seismicwaves on a geotechnical body, the problem that conventionally anchor rod pulling devices cannot apply seismic loads is solved, an input load time history curve can be changed for applying different magnitudes of seismic waves, and deformation of the anchor rod under the action of the seismic loads can be observed.
Description
technical field [0001] The invention belongs to the technical field of rock-soil anchoring engineering, and in particular relates to a dynamic pulling test device and a test method for a bolt under the action of seismic waves. Background technique [0002] Bolt support is widely used in underground engineering, slope engineering and deep foundation pit engineering because of its advantages of low support cost, low labor intensity and fast support speed. With the continuous expansion of the application range of anchor bolts, the influence of earthquake effects on anchor bolts has also been proposed. When the anchor bolts are subjected to earthquake effects, the stress state of the rock and soil will change drastically, and its anchorage performance is also different from that of static loads. Anchorage performance of lower rock and soil mass. [0003] In the field of geotechnical anti-seismic, the damage of rock and soil mass and supporting structures caused by seismic waves...
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IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 董捷王志岗赵聪仲帅马瑶瑶许鹏飞
Owner HEBEI INSTITUTE OF ARCHITECTURE AND CIVIL ENGINEERING