CN103674736B - Large triaxial shear testing instrument for rockfill material degradation - Google Patents
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Abstract
一种堆石料劣化大型三轴剪切试验仪，其特征在于包括试验主机、围压与孔压伺服加载系统、温控系统、闭环测控系统以及计算机控制与数据采集系统（15）。本发明的堆石料劣化大型三轴剪切试验仪采用多通道闭环控制器对伺服电机，减速机滚珠丝杠实现了轴向加荷和侧向加荷的双向独立高精度控制，可开展复杂应力路径下堆石料的力学特性试验。本发明的堆石料劣化大型三轴剪切试验仪采用具有温度控制泵的冷热控制装置和酸碱循环装置以及防腐管路，可同时进行物理风化和化学风化试验。本发明的堆石料劣化大型三轴剪切试验仪采用差动位移传感器和直径变形测量传感器，实现了堆石料试件干湿变化过程中体积变形动态变化过程的精确测量。
A large-scale triaxial shear tester for deterioration of rockfill materials, characterized by comprising a test host, a confining pressure and pore pressure servo loading system, a temperature control system, a closed-loop measurement and control system, and a computer control and data acquisition system (15). The large-scale three-axis shear tester for rockfill material deterioration of the present invention adopts a multi-channel closed-loop controller to realize bidirectional independent high-precision control of axial loading and lateral loading for servo motors and reducer ball screws, and can carry out complex stress tests. Mechanical properties test of rockfill material under path. The large-scale triaxial shear tester for rockfill material deterioration of the present invention adopts a cold and heat control device with a temperature control pump, an acid-base circulation device and an anti-corrosion pipeline, and can simultaneously perform physical weathering and chemical weathering tests. The large-scale triaxial shear tester for rockfill material degradation of the present invention uses a differential displacement sensor and a diameter deformation measurement sensor to realize accurate measurement of the dynamic change process of volume deformation during the dry-wet change process of the rockfill material test piece.
Description
技术领域technical field
本发明属于试验装置技术领域，涉及一种高土石坝筑坝堆石料的劣化性能测试设备，具体是一种堆石料劣化大型三轴剪切试验仪。本发明主要用于测量堆石料在经历物理风化（干湿和冷热作用）和化学风化（酸化）过程中的力学性能，同时还具备进行高土石坝堆石料复杂应力路径及流变、湿化试验研究功能。The invention belongs to the technical field of test devices, and relates to equipment for testing the deterioration performance of rockfill materials for high earth-rock dams, in particular to a large-scale triaxial shear tester for the deterioration of rockfill materials. The invention is mainly used to measure the mechanical properties of rockfill materials in the process of physical weathering (dry and wet and cold and heat) and chemical weathering (acidification), and also has the ability to carry out complex stress paths and rheological and humidification of high earth-rockfill dam rockfill materials. Experimental research function.
背景技术Background technique
目前，堆石料是构筑高土石坝的主要材料，为节省工程投资，保护生态环境，坝址附近一些易风化岩性的开挖堆石料已被广泛应用于堆石坝的填筑。一般而言堆石料的风化进程是极为缓慢的，但在某些情况下在很短甚至几个月的时间内就会发生明显的风化，堆石料力学性质的劣化会使其强度参数降低并引起坝体产生附加后期变形，从而导致大坝安全稳定性的降低。因此，研制能准确测试堆石料在劣化作用下强度变形指标的试验设备显得十分必要。At present, rockfill materials are the main materials for building high earth-rockfill dams. In order to save engineering investment and protect the ecological environment, some excavated rockfill materials that are prone to weathering lithology near the dam site have been widely used in the construction of rockfill dams. Generally speaking, the weathering process of rockfill materials is extremely slow, but in some cases, obvious weathering will occur within a short period of several months, and the deterioration of mechanical properties of rockfill materials will reduce its strength parameters and cause The dam body produces additional late deformation, which leads to the reduction of the safety and stability of the dam. Therefore, it is very necessary to develop test equipment that can accurately test the strength and deformation indicators of rockfill materials under the action of deterioration.
目前国内外已研制出少数几台用于测试堆石料劣化特性的试验设备，但存在以下主要问题：At present, a few test equipment for testing the deterioration characteristics of rockfill materials have been developed at home and abroad, but there are the following main problems:
（1）试样直径太小，缩尺效应过大。国际上现有的试验设备为意大利米兰技术大学的小型压缩仪（直径为55.7mm，高度为22mm）和英国谢菲尔德大学的小型直剪仪，国内现有的试验设备为清华大学的中型压缩仪（直径和高度均为15cm）。随着施工水平及碾压工艺的提高，堆石料的最大粒径已经达到120cm，而上述试验设备允许试验的最大粒径仅为3cm，缩尺效应过大；(1) The diameter of the sample is too small, and the scaling effect is too large. The existing test equipment in the world is the small compression instrument (55.7mm in diameter and 22mm in height) of the Technical University of Milan in Italy and the small direct shear instrument of the University of Sheffield in the UK. The existing domestic test equipment is the medium-sized compression instrument of Tsinghua University (both diameter and height are 15cm). With the improvement of construction level and rolling process, the maximum particle size of rockfill materials has reached 120cm, while the maximum particle size allowed by the above-mentioned test equipment is only 3cm, and the scale effect is too large;
（2）只能开展K0固结试验，不能开展复杂应力路径的试验研究，不能用于测定目前常用堆石料本构模型的计算参数；(2) Only the K0 consolidation test can be carried out, and the experimental research on the complex stress path cannot be carried out, and it cannot be used to determine the calculation parameters of the constitutive model of the commonly used rockfill materials at present;
（3）仅能进行物理风化试验，不能开展化学风化试验。随着全球环境污染致使酸雨引起的风化加剧，环境变化对工程的影响将也日趋显著，因此，研究堆石料经受化学风化作用后的强度和变形特性很有必要，而现有仪器没有这一功能；(3) Only physical weathering tests can be carried out, and chemical weathering tests cannot be carried out. With the intensification of weathering caused by acid rain caused by global environmental pollution, the impact of environmental changes on engineering will become more and more significant. Therefore, it is necessary to study the strength and deformation characteristics of rockfill materials after chemical weathering, but existing instruments do not have this function ;
（4）现有的大型三轴试验设备仅能测试饱和样的体积变形，不能测量干样的体积变形。(4) The existing large-scale triaxial test equipment can only test the volume deformation of saturated samples, but cannot measure the volume deformation of dry samples.
发明内容Contents of the invention
本发明的目的在于提供一种堆石料劣化大型三轴剪切试验仪，以克服上述缺陷。The object of the present invention is to provide a large-scale triaxial shear tester for the degradation of rockfill materials, so as to overcome the above-mentioned defects.
本发明的技术方案是：Technical scheme of the present invention is:
一种堆石料劣化大型三轴剪切试验仪，包括试验主机、围压与孔压伺服加载系统、温控系统、闭环测控系统以及计算机控制与数据采集系统15；所述围压与孔压伺服加载系统将加载介质增压到指定压力后通过围压增压孔、渗水孔与试验主机的压力室相连，给试样施加围压；所述温控系统将加载介质加温或制冷到一定温度；闭环测控系统包括多通道闭环测控仪以及通过电缆线连接在多通道闭环测控仪上的压力、和变形传感器；所述计算机控制与数据采集系统15与闭环测控系统相联，闭环测控系统分别与试验主机的伺服移动加载横梁与围压与孔压伺服加载系统相联，温控系统与计算机控制与数据采集系统15相联。A large-scale triaxial shear tester for rockfill material degradation, including a test host, a confining pressure and pore pressure servo loading system, a temperature control system, a closed-loop measurement and control system, and a computer control and data acquisition system 15; the confining pressure and pore pressure servo The loading system pressurizes the loading medium to a specified pressure and connects it with the pressure chamber of the test host through the confining pressure booster hole and water seepage hole to apply confining pressure to the sample; the temperature control system heats or cools the loading medium to a certain temperature The closed-loop measurement and control system includes a multi-channel closed-loop measurement and control instrument and pressure and deformation sensors connected to the multi-channel closed-loop measurement and control instrument by cables; the computer control and data acquisition system 15 is connected with the closed-loop measurement and control system, and the closed-loop measurement and control system is connected with the closed-loop measurement and control system respectively. The servo moving loading beam of the test host is connected with the confining pressure and pore pressure servo loading system, and the temperature control system is connected with the computer control and data acquisition system 15 .
所述试验主机包括自上而下依次连接的固定横梁1、伺服移动加载横梁2、四丝杠组6、负荷传感器4、压头5、压力室和主机底座8，试样置于压力室内；固定横梁1、四丝杠组6和主机底座8组成固定框架、伺服移动加载横梁2沿四丝杠组6可上下移动并对压力室内试样进行轴向加载；主机伺服电机3通过蜗轮11和齿轮传动机构12驱动四丝杠组6转动。小车9和导轨10带动压力室进出。The test host includes a fixed beam 1, a servo moving loading beam 2, a four-screw group 6, a load sensor 4, an indenter 5, a pressure chamber and a host base 8 connected sequentially from top to bottom, and the sample is placed in the pressure chamber; The fixed beam 1, the four-screw group 6 and the main machine base 8 form a fixed frame, and the servo moving loading beam 2 can move up and down along the four-screw group 6 to axially load the sample in the pressure chamber; the main machine servo motor 3 passes through the worm gear 11 and The gear transmission mechanism 12 drives the four lead screw groups 6 to rotate. The trolley 9 and the guide rail 10 drive the pressure chamber in and out.
所述压力室包括小压力室7、中压力室13和大压力室14。按照不同要求选择使用。The pressure chambers include a small pressure chamber 7 , a medium pressure chamber 13 and a large pressure chamber 14 . Choose to use according to different requirements.
所述压力室包括自上而下设置的LVDT位移传感器16、力传感器17和径向变形传感器18，径向变形传感器18设置在试样19上。The pressure chamber includes an LVDT displacement sensor 16 , a force sensor 17 and a radial deformation sensor 18 arranged from top to bottom, and the radial deformation sensor 18 is arranged on a sample 19 .
所述围压与孔压伺服加载系统20由加压伺服电机21、减速机22、滚珠丝杠加载装置23、基座24、水腔25、加载介质、电气控制部分组成，加压伺服电机21通过减速机22连接滚珠丝杠加载装置23，滚珠丝杠加载装置23的一端为水腔25，滚珠丝杠加载装置23设置在基座24上，伺服电机通过减速机驱动滚珠丝杠加载装置对水腔内的加载介质增加压力，并由电气控制部分控制运行。The confining pressure and pore pressure servo loading system 20 is composed of a pressurized servo motor 21, a reducer 22, a ball screw loading device 23, a base 24, a water chamber 25, a loading medium, and an electrical control part. The pressurized servo motor 21 Connect the ball screw loading device 23 through the reducer 22, one end of the ball screw loading device 23 is a water cavity 25, the ball screw loading device 23 is arranged on the base 24, and the servo motor drives the ball screw loading device through the reducer. The loading medium in the water chamber increases the pressure, and the operation is controlled by the electric control part.
所述温控系统包括加热机构和制冷机构，将加载介质加温或制冷到一定温度，温度控制方式为PID调节。The temperature control system includes a heating mechanism and a cooling mechanism, which heat or cool the loading medium to a certain temperature, and the temperature control method is PID regulation.
所述闭环测控系统包括多通道闭环测控仪以及压力、和变形传感器，通过电缆线与多通道闭环测控仪相联。The closed-loop measurement and control system includes a multi-channel closed-loop measurement and control instrument and pressure and deformation sensors, which are connected with the multi-channel closed-loop measurement and control instrument through cables.
计算机控制和处理系统将参数和控制信号传输给闭环测控系统，闭环测控系统根据上述参数和控制信号控制轴向与围压伺服加载系统，轴向与围压伺服加载系统根据所给压力、位移控制信号对试件加载，温控系统根据计算机控制和处理系统的参数要求，将围压与孔压伺服加载系统中加载介质加温或制冷到一定温度，试件受压力后产生的变形值，通过传感器采集相关参数反馈至所述闭环测控系统中的闭环控制仪，闭环控制仪将采集到的参数经放大处理后传输给计算机控制处理系统，并通过显示器显示和打印机打印出最终结果。The computer control and processing system transmits the parameters and control signals to the closed-loop measurement and control system. The closed-loop measurement and control system controls the axial and confining pressure servo loading system according to the above parameters and control signals, and the axial and confining pressure servo loading system is controlled according to the given pressure and displacement. The signal loads the test piece, and the temperature control system heats or cools the loading medium in the confining pressure and pore pressure servo loading system to a certain temperature according to the parameter requirements of the computer control and processing system. The deformation value of the test piece after the pressure is passed The relevant parameters collected by the sensor are fed back to the closed-loop controller in the closed-loop measurement and control system, and the closed-loop controller transmits the collected parameters to the computer control processing system after amplifying and processing, and prints out the final result through display and printer.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明的堆石料劣化大型三轴剪切试验仪具有以下特点：The rockfill material degradation large-scale triaxial shear tester of the present invention has the following characteristics:
（1）试样直径分为10cm、20cm和30cm三种，能在同一台设备上开展最大粒径为2cm、4cm、6cm力学特性试验，有效解决了不同设备间系统误差将对测试结果的影响，可用于研究缩尺效应对堆石料力学特性的影响；(1) The diameter of the sample is divided into three types: 10cm, 20cm and 30cm. The maximum particle size of 2cm, 4cm and 6cm can be tested on the same equipment, which effectively solves the impact of systematic errors between different equipment on the test results. , which can be used to study the influence of scale effect on the mechanical properties of rockfill materials;
（2）本发明的堆石料劣化大型三轴剪切试验仪采用多通道闭环控制器对伺服电机，减速机滚珠丝杠实现了轴向加荷和侧向加荷的双向独立高精度控制，可开展复杂应力路径下堆石料的力学特性试验；(2) The large-scale triaxial shear tester for rockfill material deterioration of the present invention adopts a multi-channel closed-loop controller to realize two-way independent high-precision control of axial loading and lateral loading for servo motors and reducer ball screws, which can Carry out tests on the mechanical properties of rockfill materials under complex stress paths;
（3）本发明的堆石料劣化大型三轴剪切试验仪采用具有温度控制泵的冷热控制装置和酸碱循环装置以及防腐管路，可同时进行物理风化和化学风化试验；(3) The large-scale triaxial shear tester for rockfill material deterioration of the present invention adopts a cooling and heating control device with a temperature control pump, an acid-base circulation device and anti-corrosion pipelines, and can simultaneously perform physical weathering and chemical weathering tests;
（4）本发明的堆石料劣化大型三轴剪切试验仪采用差动位移传感器和和直径变形测量传感器，实现了堆石料试件干湿变化过程中体积变形动态变化过程的精确测量；(4) The large-scale triaxial shear tester for rockfill material degradation of the present invention uses differential displacement sensors and diameter deformation measurement sensors to realize accurate measurement of the dynamic change process of volume deformation during the dry-wet change process of rockfill material specimens;
（5）本发明的堆石料劣化大型三轴剪切试验仪采用伺服电机减速机滚珠丝杠对轴向加载与围压孔压调压方式，可进行轴向荷载为1500kN、围压为4MPa、持续时间不少于30天的流变变形试验。(5) The large-scale triaxial shear tester for rockfill material deterioration of the present invention adopts the servo motor reducer ball screw for axial loading and confining pressure pore pressure regulation, and can perform axial load of 1500kN, confining pressure of 4MPa, A rheological deformation test with a duration of not less than 30 days.
附图说明Description of drawings
图1为本发明的总装结构示意图。Fig. 1 is a schematic diagram of the assembly structure of the present invention.
图2为本发明的试验主机的结构示意图。Fig. 2 is a structural schematic diagram of the test host of the present invention.
图3为本发明的试验主机的俯视示意图。Fig. 3 is a schematic top view of the test host of the present invention.
图4为本发明的围压与孔压伺服加载系统图。Fig. 4 is a diagram of the confining pressure and pore pressure servo loading system of the present invention.
图5为本发明的三轴压力室图。Figure 5 is a diagram of a triaxial pressure chamber of the present invention.
图中：1为固定横梁、2为伺服移动加载横梁、3为主机伺服电机、4为负荷传感器、5为压头、6为四丝杠组、7为小压力室、8为主机底座、9为小车、10为导轨、11为蜗轮、12为齿轮传动机构、13为中压力室、14为大压力室、15为计算机控制与数据采集系统、16为LVDT位移传感器、17为力传感器、18为径向变形传感器、19为压力室底座、20为围压与孔压伺服加载系统、21为加压伺服电机、22为减速机、23为滚珠丝杠加载装置、24为基座、25为水腔。In the figure: 1 is the fixed beam, 2 is the servo moving loading beam, 3 is the servo motor of the main engine, 4 is the load sensor, 5 is the pressure head, 6 is the four-screw group, 7 is the small pressure chamber, 8 is the base of the main machine, 9 10 is a trolley, 10 is a guide rail, 11 is a worm wheel, 12 is a gear transmission mechanism, 13 is a medium pressure chamber, 14 is a large pressure chamber, 15 is a computer control and data acquisition system, 16 is an LVDT displacement sensor, 17 is a force sensor, 18 19 is the pressure chamber base, 20 is the confining pressure and pore pressure servo loading system, 21 is the pressurization servo motor, 22 is the reducer, 23 is the ball screw loading device, 24 is the base, 25 is water cavity.
具体实施方式Detailed ways
下面结合具体图示，进一步阐述本项发明的实现技术手段、创新点与主要功能。The technical means, innovations and main functions of this invention will be further elaborated below in conjunction with specific illustrations.
如图1～3所示，一种堆石料劣化大型三轴剪切试验仪，包括试验主机、围压与孔压伺服加载系统、温控系统、闭环测控系统以及计算机控制与数据采集系统15；所述围压与孔压伺服加载系统将加载介质增压到指定压力后通过围压增压孔、渗水孔与试验主机的压力室相连，给试样施加围压；所述温控系统将加载介质加温或制冷到一定温度；闭环测控系统包括多通道闭环测控仪以及通过电缆线连接在多通道闭环测控仪上的压力和变形传感器；所述计算机控制与数据采集系统15与闭环测控系统相联，闭环测控系统分别与试验主机的伺服移动加载横梁与围压与孔压伺服加载系统相联，温控系统与计算机控制与数据采集系统15相联。As shown in Figures 1 to 3, a large-scale triaxial shear tester for rockfill material deterioration, including a test host, a servo loading system for confining pressure and pore pressure, a temperature control system, a closed-loop measurement and control system, and a computer control and data acquisition system 15; The confining pressure and pore pressure servo loading system pressurizes the loading medium to a specified pressure and then connects with the pressure chamber of the test host through the confining pressure boosting hole and the water seepage hole to apply confining pressure to the sample; the temperature control system will load The medium is heated or refrigerated to a certain temperature; the closed-loop measurement and control system includes a multi-channel closed-loop measurement and control instrument and pressure and deformation sensors connected to the multi-channel closed-loop measurement and control instrument through cables; the computer control and data acquisition system 15 is connected to the closed-loop measurement and control system The closed-loop measurement and control system is connected with the servo moving loading beam of the test host and the confining pressure and pore pressure servo loading system respectively, and the temperature control system is connected with the computer control and data acquisition system 15.
试验主机包括自上而下依次连接的固定横梁1、伺服移动加载横梁2、四丝杠组6、负荷传感器4、压头5、压力室和主机底座8，试样置于压力室内；固定横梁1、四丝杠组6和主机底座8组成固定框架、伺服移动加载横梁2沿四丝杠组6可上下移动并对压力室内试样进行轴向加载；主机伺服电机3通过蜗轮11和齿轮传动机构12驱动四丝杠组6转动。小车9和导轨10带动压力室进出。The test host includes a fixed beam 1, a servo moving loading beam 2, a four-screw group 6, a load sensor 4, an indenter 5, a pressure chamber and a host base 8 connected sequentially from top to bottom. The sample is placed in the pressure chamber; the fixed beam 1. The four-screw group 6 and the main engine base 8 form a fixed frame, and the servo mobile loading beam 2 can move up and down along the four-screw group 6 to axially load the sample in the pressure chamber; the main engine servo motor 3 is driven by the worm wheel 11 and gears Mechanism 12 drives four lead screw groups 6 to rotate. The trolley 9 and the guide rail 10 drive the pressure chamber in and out.
压力室包括小压力室7、中压力室13和大压力室14。按照不同要求选择使用。The pressure chambers include a small pressure chamber 7 , a medium pressure chamber 13 and a large pressure chamber 14 . Choose to use according to different requirements.
压力室包括自上而下设置的LVDT位移传感器16、力传感器17和径向变形传感器18，径向变形传感器18设置在试样上。The pressure chamber includes an LVDT displacement sensor 16, a force sensor 17 and a radial deformation sensor 18 arranged from top to bottom, and the radial deformation sensor 18 is arranged on the sample.
围压与孔压伺服加载系统20由加压伺服电机21、减速机22、滚珠丝杠加载装置23、基座24、水腔25、加载介质、电气控制部分组成，加压伺服电机21通过减速机22连接滚珠丝杠加载装置23，滚珠丝杠加载装置23的一端为水腔25，滚珠丝杠加载装置23设置在基座24上，伺服电机通过减速机驱动滚珠丝杠加载装置对水腔内的加载介质增加压力，并由电气控制部分控制运行。The confining pressure and pore pressure servo loading system 20 is composed of a pressurization servo motor 21, a reducer 22, a ball screw loading device 23, a base 24, a water chamber 25, a loading medium, and an electrical control part. The machine 22 is connected with a ball screw loading device 23, one end of the ball screw loading device 23 is a water chamber 25, the ball screw loading device 23 is arranged on the base 24, and the servo motor drives the ball screw loading device to the water chamber through a reducer. The loading medium inside increases the pressure, and the operation is controlled by the electrical control part.
温控系统包括加热机构和制冷机构，将加载介质加温或制冷到一定温度，温度控制方式为PID调节。The temperature control system includes a heating mechanism and a cooling mechanism, which heat or cool the loading medium to a certain temperature, and the temperature control method is PID adjustment.
闭环测控系统包括多通道闭环测控仪以及压力和变形传感器，通过电缆线与多通道闭环测控仪相联。The closed-loop measurement and control system includes a multi-channel closed-loop measurement and control instrument and pressure and deformation sensors, which are connected with the multi-channel closed-loop measurement and control instrument through cables.
闭环测控系统包括多通道闭环测控仪以及通过电缆线联接在多通道闭环测控仪上的压力和变形传感器；计算机控制处理系统与闭环测控系统相联，闭环测控系统同围压伺服加载系统相联，温控系统同围压伺服加载系统相联。The closed-loop measurement and control system includes a multi-channel closed-loop measurement and control instrument and pressure and deformation sensors connected to the multi-channel closed-loop measurement and control instrument through cables; the computer control processing system is connected with the closed-loop measurement and control system, and the closed-loop measurement and control system is connected with the confining pressure servo loading system. The temperature control system is connected with the confining pressure servo loading system.
计算机控制处理系统将参数和控制信号传输给闭环测控系统，闭环测控系统根据上述参数和控制信号控制轴向与围压与孔压伺服加载系统，轴向与围压伺服加载系统根据所给压力、位移控制信号对试件加载，温控系统根据计算机控制和处理系统的参数要求，将围压伺服加载系统中加载介质加温或制冷到一定温度，试件受到轴向与围压并产生变形值，通过压力、位移传感器采集相关参数反馈至所述闭环测控系统中的闭环测控仪，闭环测控仪将采集到的参数经放大处理后传输给计算机控制和处理系统，并通过显示器显示和打印机打印出最终结果。操作时，将试件装在压力室中，并将轴向伺服伺服移动加载横梁加载系统、围压伺服加载系统、闭环测控系统、计算机控制和处理系统、温控系统接好电源，检查接线无误后，通电试车，试车成功，即可进入试验。The computer control processing system transmits the parameters and control signals to the closed-loop measurement and control system. The closed-loop measurement and control system controls the axial and confining pressure and pore pressure servo loading system according to the above parameters and control signals. The axial and confining pressure servo loading system is based on the given pressure, The displacement control signal loads the test piece, and the temperature control system heats or cools the loading medium in the confining pressure servo loading system to a certain temperature according to the parameter requirements of the computer control and processing system, and the test piece is subjected to axial and confining pressure and produces a deformation value The relevant parameters collected by the pressure and displacement sensors are fed back to the closed-loop measurement and control instrument in the closed-loop measurement and control system, and the closed-loop measurement and control instrument transmits the collected parameters to the computer control and processing system after amplifying and processing, and displays them on the display and prints them out on the printer Final Results. During operation, install the test piece in the pressure chamber, and connect the axial servo servo moving loading beam loading system, confining pressure servo loading system, closed-loop measurement and control system, computer control and processing system, and temperature control system to the power supply, and check that the wiring is correct Finally, turn on the power for a test run. If the test run is successful, you can enter the test.
通过计算机控制处理系统将闭环测控系统中的各种传感器清零，开始进行试验，选择加卸载方式，即可进入试验状态。试验结束后，计算机控制处理系统发出指令，让围压伺服加载系统停止工作。Clear the various sensors in the closed-loop measurement and control system through the computer control processing system, start the test, select the loading and unloading mode, and then enter the test state. After the test, the computer control processing system issued an instruction to stop the confining pressure servo loading system from working.
本发明的堆石料劣化大型三轴剪切试验仪的主要创新与功能为：The main innovations and functions of the rockfill material degradation large-scale triaxial shear tester of the present invention are:
1、主机上的加载横梁可以从0-1.7m调整高度，根据试验要求可灵活更换试样尺寸，实现了在同一台设备上研究堆石料缩尺效应的设想，有效解决了缩尺效应研究中不同试验机的系统误差对试验结果的影响。1. The height of the loading beam on the host machine can be adjusted from 0-1.7m, and the size of the sample can be flexibly changed according to the test requirements, which realizes the idea of studying the scaling effect of rockfill materials on the same equipment, and effectively solves the problem of scaling effect research. The influence of the systematic errors of different testing machines on the test results.
2、闭环高精度控制器可分别控制3套伺服电机减速机滚珠丝杠加载，实现了轴向加荷和侧向加荷的双向独立高精度控制，可开展复杂应力路径下堆石料的力学特性试验。2. The closed-loop high-precision controller can separately control the loading of 3 sets of servo motor reducer ball screw, realize the bidirectional independent high-precision control of axial loading and lateral loading, and can develop the mechanical characteristics of rockfill materials under complex stress paths test.
3、采用具有温度控制泵的冷热控制装置和酸碱循环装置以及防腐管路，可同时进行物理风化和化学风化试验。3. It adopts the cold and heat control device with temperature control pump, acid-base circulation device and anti-corrosion pipeline, which can carry out physical weathering and chemical weathering tests at the same time.
4、采用差动位移传感器和和直径变形测量传感器，实现了堆石料试样干湿变化过程中体积变形动态变化过程的精确测量。4. The differential displacement sensor and the diameter deformation measurement sensor are used to realize the accurate measurement of the dynamic change process of the volume deformation during the dry-wet change process of the rockfill material sample.
5、加载横梁上的伺服电机蜗轮齿轮减速机加载装置，具有负荷时不可逆转的自锁特性，且在闭环控制器作用下，能依照试样变形情况调整负荷大小，实行力、位移闭环控制，该加载系统能提供长期稳定的压力而不会产生压力波动情况。5. The loading device of the servo motor worm gear reducer on the loading beam has irreversible self-locking characteristics under load, and under the action of the closed-loop controller, the load can be adjusted according to the deformation of the sample, and the closed-loop control of force and displacement can be implemented. The loading system can provide long-term stable pressure without pressure fluctuations.
上面所述的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的构思和范围进行限定，在不脱离本发明设计构思前提下，本领域中普通工程技术人员对本发明的技术方案作出的各种变型和改进，均应落入本发明的保护范围，本发明请求保护的技术内容已经全部记载在权利要求书中。The above-described embodiments are only described to the preferred implementation of the present invention, and are not intended to limit the concept and scope of the present invention. Under the premise of not departing from the design concept of the present invention, ordinary engineers and technicians in the field can make technical solutions of the present invention. The various modifications and improvements should fall within the protection scope of the present invention, and the technical content claimed in the present invention has been fully recorded in the claims.
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| CN105181483B (en) * | 2015-10-15 | 2017-05-03 | 安徽省建筑科学研究设计院 | Compression-shear testing apparatus for rock in dry-wet cyclic process |
| CN106644729A (en) * | 2016-10-28 | 2017-05-10 | 中南大学 | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source |
| CN106761730B (en) * | 2016-12-20 | 2019-08-06 | 安徽理工大学 | A Quickly Disassembled Clamping Assembly and Its Confining Pressure Experimental Device |
| CN108709809A (en) * | 2018-01-12 | 2018-10-26 | 中铁二院工程集团有限责任公司 | A kind of simple rock weathering, creep integration experimental rig and test method |
| CN109932249A (en) * | 2019-03-28 | 2019-06-25 | 河海大学 | Rockfill triaxial test device |
| CN113820220A (en) * | 2021-11-22 | 2021-12-21 | 成都东华卓越科技有限公司 | Large-scale coarse-grained soil triaxial testing machine and control method thereof |
| CN115389346A (en) * | 2022-08-30 | 2022-11-25 | 中国水利水电科学研究院 | Closed-loop control system applied to on-site large-scale mechanical test and control method thereof |
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