PL-v100 - 便携式点荷载试验仪
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PL-100V 是一款经济实惠的便携式点荷载试验仪，用于测定岩石强度分类的点荷载强度指数。其数字读数单元配有大尺寸显示屏，电池供电，带键盘。
PL-100V 是一款经济实惠的便携式点荷载试验仪，用于测定岩石强度分类的点荷载强度指数。其数字读数单元配有大尺寸显示屏，电池供电，带键盘。
PL-100V 点荷载试验仪由加载框架、液压缸、泵和带数字读数单元的压力表组成，用于最大载荷读数。上锥形压板固定在框架上，下压板固定在液压缸活塞上。框架上固定有刻度尺，指示试样直径。
试验程序
根据可用岩石试样使用三种点荷载试验配置：
直径法 – 轴向法 – 不规则块法
直径法和轴向法分别使用长径比（L/D）大于 1.0 和介于 0.3 与 1.0 之间的岩芯试样。没有岩芯时使用合适不规则形状的岩石块。
所有配置的试验步骤相同：
试样放置在锥形压板之间，闭合压板以接触。在刻度尺上读取接触点之间的距离"De"。增加载荷使破坏在 10 至 60 秒内发生，并读取和记录破坏载荷"P"。
主要特性
载荷能力达 100 kN
可选 kN 力单位显示
便于运输
直接读取试样直径
载荷分辨率：1N
载荷测量精度：+/- 1%
应用领域
测定岩石强度分类的点荷载强度指数
测定岩石各向异性
预测其他岩石强度特性，如单轴拉伸和压缩强度
| General specifications | |
| Maximum specimen size | 102 mm |
| Maximum load | 100 kN |
| Effective resolution | 18 bit (1/262’000 div) |
| Pressure gauge | |
| Range | 100 000 kPa |
| Accuracy | 1% F.S. |
| Available units | kN*, MPa, psi |
| Load measurement accuracy | 1 kN |
* Based on conversion factor determined at calibration
| Main frame assembly | |
| Height | 418 mm |
| Length | 200 mm |
| Depth | 200 mm |
| Weight | 14 kg |
| Pump assembly | |
| Height | 160 mm |
| Length | 798 mm |
| Depth | 310 mm |
| Weight | 8.3 kg |
Interpretation The Point Load Tester allows users to determine an “Uncorrected Point Load Strength Index” (Is). This index must be corrected to a standard equivalent diameter (De) of 50 mm. It then becomes a unique property of the rock tested (Is(50)) which is most useful in rock strength classification.
Rock anisotropy is quantified by the “Strength Anisotropy Index” (Ia(50)). This index is the ratio of the greatest to least (Is(50)) index measured respectively perpendicular and parallel to the existing planes of weakness.
The uniaxial tensile (UTS) and compressive (UCS) strengths can be approximated from the Is(50) index. The UTS is about 1.25 times Is(50) and the UCS is normally between 20 and 25 times the Is(50) index.
Is is obtained from the following equation:
Is = P / De2 where:
- Is : Uncorrected Point Load Strength Index, in MPa or psi
- P : Failure load, in MN or lbf
- De : Equivalent core diameter, in meters or inches (De = D for diametral tests)
The ISRM* “Suggested Method for Determining Point Load Strength” size correction procedure is used. Is(50) is obtained either graphically, mathematically or by testing 50 mm (maximum diameter) specimens.
*ISRM: International Society of Rock Mechanics.
The unit comes in a custom-made road case.
Accessoires disponibles
- Set of spare conical platens
- Set of spare protective shields
- Calibration Kit
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