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System and method of hydraulic anchor rod drawing creep test based on creeper

A creep test and creep instrument technology, which is used in the application of stable tension/pressure to test the strength of materials, instruments, scientific instruments, etc. Perfection, unclear constitutive relationship, etc., to achieve the effect of reliable test method, high stiffness, and reliable test system

Active Publication Date: 2018-11-16
ZHONGYUAN ENGINEERING COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"Currently, most of the anchoring body creep tests do not satisfy the actual physical state and occurrence environment of the rock. Some domestic scholars took the lead in conducting multi-field coupling tests, which restored the actual situation to a certain extent. The constitutive relationship in the deformation stage is not yet clear, the nonlinear creep constitutive model is still incomplete, and the understanding of the creep failure mechanism is not deep enough. Therefore, based on the background of the deep development of underground engineering, it is necessary to further carry out comprehensive and Hierarchical creep tests to fill theoretical gaps and guide engineering practice

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  • System and method of hydraulic anchor rod drawing creep test based on creeper
  • System and method of hydraulic anchor rod drawing creep test based on creeper
  • System and method of hydraulic anchor rod drawing creep test based on creeper

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: as Figure 1~8 所示的一种基于蠕变仪的液压式锚杆拉拔蠕变试验系统,包括试样检测装置、试样固定装置、加压装置和液压转换装置6;试样检测装置包括电脑1、应变仪2和锚杆测力计9,应变仪2包含有应变片13,电脑1、应变仪2、锚杆测力计9以及应变片13通过导线依次连接;所述试样固定装置包括桌台3、钢板4、锚杆7和试样夹具8,桌台3固定设在地面上,钢板4固定设在桌台3的台面下方,试样夹具8内装有岩石试样15,岩石试样15内预埋有应变片13,钢板4中间开设有通孔I,锚杆7穿过通孔I插设在岩石试样15的中轴线上,锚杆测力计9安装在锚杆7上,锚杆测力计9处于钢板4和试样夹具8之间;所述加压装置包括蠕变仪5,蠕变仪5包括蠕变仪压头51和蠕变仪工作台52;液压转换装置6包括主动千斤顶10、从动千斤顶11以及连接主动千斤顶10和从动千斤顶11的液压管道12,主动千斤顶10下端固定设在蠕变仪压头51正下方的蠕变仪工作台52上,从动千斤顶11固定设置在桌台3上,桌台3上设有通孔II,从动千斤顶11的拉杆穿过通孔II与锚杆7固定连接。

[0029] 一种基于蠕变仪的液压式锚杆拉拔蠕变试验方法,包含以下步骤:

[0030] 步骤一:在岩石试样15中心轴线上进行钻孔,将岩石试样15沿中心轴线向两边裂开,在岩石试样15的径向钻孔内壁上贴应变片13,把锚杆7放在岩石试样15的钻孔内并用锚固剂14粘合;

[0031] 步骤二:将岩石试样15和锚杆7放入试样夹具8内并置于钢板4下,在钢板4和试样夹具8中间放置锚杆测力计9,将从动千斤顶11置于桌台3上,将锚杆7通过锚杆固定栓114与拉杆113相连,调整主动千斤顶10的位置,使主动液压活塞102处于蠕变仪压头51的正下方;

[0032] 步骤三:通过导线依次连接电脑1、应变仪2、锚杆测力计9以及应变片13;检查线路确定正常后,根据锚杆7的极限抗拔力,通过蠕变仪5、液压转换装置、锚杆7进行力的传递,并最终实现对岩石试样15进行逐级加载,通过应变片13把力转化为电信号传递给应变仪2,应变仪2得出的数据传输给电脑1进行实时计算、显示,根据试验过程确定对岩石试样15的合理加载方式与试验终止条件;

[0033] 步骤四:整理应变仪2的测试数据,绘制应变-时间曲线,作为研究锚...

Embodiment 2

[0034]Embodiment 2: A hydraulic anchor rod pulling creep test system based on a creep meter, the active jack 10 includes an active hydraulic cylinder 101 and an active hydraulic piston 102, and the bottom end of the active hydraulic cylinder 101 is fixed on the creep meter On the workbench 52, the active hydraulic piston 102 is directly below the indenter 51 of the creep instrument; the driven jack 11 includes a driven hydraulic cylinder 111, a driven hydraulic piston 112, and a pull rod 113, and the upper end of the pull rod 113 passes through the through hole II and the driven jack 113. The bottom of the hydraulic cylinder 111 is fixedly connected with the bottom of the driven hydraulic piston 112; other structures and test methods are the same as those in Embodiment 1.

Embodiment 3

[0035] Embodiment 3: A hydraulic anchor rod pulling creep test system based on a creep meter, the active jack 10 includes an active hydraulic cylinder 101 and an active hydraulic piston 102, and the bottom end of the active hydraulic cylinder 101 is fixed on the creep On the instrument workbench 52, the active hydraulic piston 102 is directly below the indenter 51 of the creep instrument; the driven jack 11 includes a driven hydraulic cylinder 111, a driven hydraulic piston 112, and a pull rod 113, and the lower end of the pull rod 113 passes through the upper end of the anchor rod 7. The anchor bolt 114 with internal thread is threaded; other structures and test methods are the same as in Embodiment 2.

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Abstract

The invention relates to the field of rock mechanics and particularly relates to a system and method of a hydraulic anchor rod drawing creep test based on a creeper. The system of the test mainly comprises a sample detecting device, a sample fixing device, a pressing device and a hydraulic conversion device. The sample detecting device comprises a computer, a strain gauge and an anchor rod dynamometer. The sample fixing device comprises a table, a steel plate, an anchor rod and a sample holder. The pressing device comprises a creeper. The hydraulic conversion device comprises an active jack, adriven jack and a hydraulic pipe connecting the active jack and the driven jack. The system fully utilizes the advantages of high rigidity and small error of the creeper. The hydraulic conversion device solves the problems of a small loading space and a single loading direction of the creeper. The hydraulic conversion device keeps a small energy loss and good stability in the load transfer process and keeps a certain constant force for a long time.

Description

technical field [0001] 本发明涉及岩石力学领域,特别是指一种基于蠕变仪的液压式锚杆拉拔蠕变试验系统和方法。 Background technique [0002] 深部岩石工程不断向纵深发展导致岩石工程所处的环境愈发复杂,具体表现为“高地应力”、“高地温”、“高水压”以及工程施工带来的扰动。锚杆作为一种有效的支护手段,在地下空间围岩支护领域发挥着重要作用,随着时间推移,围岩在“三高一扰动”的环境下,其蠕变效应日益明显。数据表明,大多数地下工程垮塌事故往往是在完工后的使用阶段发生的,锚固体的蠕变效应是诱发因素之一,而每年因蠕变灾害造成的国民经济损失和人员伤亡也在不断增加。因此,研究锚固体的蠕变特性,揭示其蠕变机理是当下迫在眉睫的发展需求。 [0003] 国内外学者对锚固体力学特性做了大量研究,也取得了喜人的成果,然而在锚固体蠕变领域研究较少,其成果尚不足以支撑当下深部岩石工程的纵深发展。王思敬院士认为:“只有将岩体视为一个不确定的系统,才能在复杂的岩石力学问题的解决、提高理论和数值分析结果的可靠性和实用性方面取得突破。”当前大多数锚固体蠕变试验不满足岩石实际物理状态和赋存环境,国内部分学者率先进行了多场耦合试验,一定程度上还原了实际状况,然而对锚固体多场耦合作用下加速蠕变阶段的本构关系尚不明确,非线性蠕变本构模型仍不完善,对蠕变破坏机理的认识不够深刻,因此,基于地下工程纵深发展的大背景,有必要进一步开展全方位、多层次的蠕变试验来填补理论缺陷,指导工程实践。 Contents of the invention [0004] 为了解决背景技术中所存在的问题,本发明提出了一种基于蠕变仪的液压式锚杆拉拔蠕变试验系统和方法。 [0005] 本发明的技术方案是:一种基于蠕变仪的液压式锚杆拉拔蠕变试验系统,包括试样检测装置、试样固定装置、加压装置和液压转换装置;试样检测装置包括电脑、应变仪和锚杆测力计,应变仪包含有应变片,电脑、应变仪、锚杆测力计以及应变片通过导线依次连接;所述试样固定装置包括桌台、钢板、锚杆和试样夹具,桌台固定设在地面上,钢板固定设在桌台的台面下方,试样夹具内装有岩石试样,岩石试样内预埋有应变片,钢板中间开设有通孔I,锚杆穿过通孔I插设在岩石试样的中轴线上;所述加压装置包括蠕变仪,蠕变仪包括蠕变仪压...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/12
CPCG01N3/02G01N3/12G01N2203/0071
Inventor 胡江春王红芳崔力孙光林李渊孙发用吉梦洁李鹏飞鲁家濠
Owner ZHONGYUAN ENGINEERING COLLEGE