岩石测向约束膨胀试验仪概述:
该仪器为千分表数字直读式结构，适用于各类岩石膨胀性试验中的侧向约束情况下，轴向位移变化的试验，配有透水板，千分表等试验装置。
Overview of rock direction-directed expansion tester:
The instrument is a dial gauge digital direct reading structure, which is suitable for the test of axial displacement change under the lateral restraint condition of various rock swelling tests, and is equipped with a test device such as a water permeable plate and a dial gauge.
岩石测向约束膨胀试验仪技术参数:
★千分表量程：1mm
★精 度：0.001mm
★玻璃槽长*宽：95*95mm
★玻璃槽高度：85mm
★金属环直径：φ50mm
★金属环高度：55mm
★设计试块尺寸：φ50*20mm
★主机外形尺寸：200*100*195mm
Technical parameters of rock direction-directing expansion tester:
★ Dial gauge range: 1mm
★ Precision: 0.001mm
★ glass slot length * width: 95 * 95mm
★Glass tank height: 85mm
★Metal ring diameter: φ50mm
★ Metal ring height: 55mm
★Design test block size: φ50*20mm
★ Host size: 200*100*195mm
岩石测向约束膨胀试验仪试验步骤:
★将试件放入内壁涂有凡士林的金属套环内，在试件上下分别放置薄型滤纸和透水板。
★顶部放上固定金属荷载块并安装垂直千分表。金属荷载块的质量应能对试件产生5kPa的持续压力。
★读记千分表读数，每10min读记1次，直至3次读数不变
★缓慢地向盛水容器内注人洁净水，直至淹没上部透水板。
★在第1小时内，每隔l0min测读变形1次，以后每隔1h测读变形1次，直至3次读数差不大于0.001mm为止。浸水后试验时间不得小于48h。
★试验过程中，应保持水位不变，水温变化不得大于2℃
★试验过程中及试验结束后，应详细描述试件的崩解、掉块、表面泥化或软化等现象。
Rock direction-finding expansion tester test steps:
★ Place the test piece in the metal collar with Vaseline on the inner wall, and place thin filter paper and water permeable plate on top of the test piece.
★ Place a fixed metal load block on top and install a vertical dial gauge. The mass of the metal load block shall be capable of producing a continuous pressure of 5 kPa on the test piece.
★Read the dial gauge readings and read them every 10 minutes until the 3 readings remain unchanged.
★ Slowly inject clean water into the water container until the upper permeable plate is submerged.
★In the first hour, the deformation is measured once every 10 minutes, and then the deformation is read once every 1 hour until the difference of 3 readings is not more than 0.001 mm. The test time after immersion shall not be less than 48 hours.
★ During the test, the water level should be kept unchanged, and the water temperature change should not exceed 2 °C.
★ During the test and after the test, the disintegration, falling off, surface muddy or softening of the test piece shall be described in detail.
岩石测向约束膨胀试验仪侧向约束膨胀率计算:
按下列公式分别计算岩石自由膨胀率、侧向约束膨胀率、膨胀压力
VH=△H/H *100
VD=△D/D *100
VHP=△H1/H *100
PS=F/A
式中：
VH——岩石轴向自由膨胀率(%)
VD——岩石径向自由膨胀率(%)
VHP——岩石侧向约束膨胀率(%)
Ps——岩石膨胀压力(MPa)
△H——试件轴向变形值(mm)
H——试件高度mm
△D——试件径向平均变形值(mm)
D——试件直径或边长(mm)
△H1——有侧向约束试件的轴向变形值(mm)
F——轴向荷载(N)
A——试件截面积(mm2)
岩石轴向自由膨胀率、径向自由膨胀率、侧向约束膨胀率试验结果精确至0.1%,
岩石膨胀压力试验结果精确至0.001MPa.
Calculation of lateral constrained expansion ratio of rock direction-finding expansion tester:
Calculate the rock's free expansion rate, lateral restraint expansion rate, and expansion pressure according to the following formula
VH=△H/H *100
VD=△D/D *100
VHP=△H1/H *100
PS=F/A
In the formula:
VH——axial free expansion rate of rock (%)
VD - radial free expansion rate of rock (%)
VHP - rock lateral restraint expansion rate (%)
Ps - rock expansion pressure (MPa)
△H——axial deformation value of the test piece (mm)
H——test piece height mm
△D——The radial average deformation value of the test piece (mm)
D——test piece diameter or side length (mm)
△H1——axial deformation value of the laterally constrained test piece (mm)
F——axial load (N)
A——cross-sectional area of the test piece (mm2)
The experimental results of axial free expansion rate, radial free expansion rate and lateral restraint expansion rate of the rock are accurate to 0.1%, and the rock expansion pressure test results are accurate to 0.001 MPa.
岩石测向约束膨胀试验仪试验记录:
膨胀性试验记录应包括岩石名称、试验编号、试件编号、试件描述、试件尺寸、温度、试验时间、轴向变形、径向变形和轴向荷载。
Rock direction finding constrained expansion tester test record:
The expansive test record shall include the rock name, test number, test piece number, test piece description, test piece size, temperature, test time, axial deformation, radial deformation and axial load.
