岩石结构面基本摩擦角测试仪的研制与应用  

Development and application of basic friction angle tester of rock discontinuity

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作  者:陈琼[1] 吕原君 杜时贵 CHEN Qiong;LU Yuan-jun;DU Shi-gui(School of Mechanical and Electrical Engineering,Zhejiang Industry Polytechnic College,Shaoxing,Zhejiang 312000,China;Institute of Rock Mechanics,Ningbo University,Ningbo,Zhejiang 315211,China)

机构地区:[1]浙江工业职业技术学院机电工程学院,浙江绍兴312000 [2]宁波大学岩石力学研究所,浙江宁波315211

出  处:《岩土力学》2021年第8期2321-2329,共9页Rock and Soil Mechanics

基  金:国家自然科学基金(No.41427802)。

摘  要:倾斜试验法是获取岩石基本摩擦角的常用方法,但是现有倾斜测试技术未形成公认的规范,导致同种岩石材料测试结果差异较大。在现有试验仪结构及测试机制的基础上,研制出可通过倾斜或推拉方法获取岩石基本摩擦角的测试仪。它可测试尺寸长为50~150mm、高为25~75mm的系列多尺度试样,通过伺服电机和高速比减速器实现了角速度范围为6~60(°)/min的高精度匀速转动控制,并可实时监控并记录试样滑移距离、倾斜转角等试验参数。提出了测试基本摩擦角的操作流程,分析了试样尺寸及粒度、旋转角速度、滑移距离设置、结构面干燥度等影响测试结果的主要因素,给出了花岗岩、辉绿岩等11种结构面尺寸为100 mm×100 mm的试样基本摩擦角,为完善基本摩擦角测试仪的试验规范提供参考。Tilt test is a common method to obtain the basic friction angle of rock.However,the existing tilt test technology has not formed a recognized standard,leading to an obvious difference between the test results of the same kind of rock materials.To solve this problem,an inclinometer was developed to measure the basic friction angle of rock based on the existing tester structure and testing mechanism.A series of multi-scale specimens with dimensions ranging from 50 mm to 150 mm in length and 25 mm to 75 mm in height can be tested.The high-precision rotation control of angular speed ranging from 6(°)/min to 60(°)/min can be realized through the servo motor and the high-speed ratio reducer.The corresponding test parameters,such as specimen’s sliding distance and inclination angle,can be monitored and recorded in real time.Then,the operation flow of testing basic friction angle was put forward.The main factors that have obvious effects on the experimental results were analyzed,such as specimen size and processing technology,angular velocity,test results criterion and the dryness of the structural plane.In this paper,the basic friction angles of 11 specimens,including granite and diabase,with discontinuity size of 100 mm×100 mm were tested,and it provided a reference for the test specification of inclinometer.

关 键 词:倾斜测试仪 基本摩擦角 结构设计 控制 推拉测试 

分 类 号:TU458.3[建筑科学—岩土工程]

 

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