巖石測向約束膨脹試驗儀概述:
該儀器為千分表數字直讀式結構，適用于各類(lèi)巖石膨脹性試驗中的側向約束情況下，軸向位移變化的試驗，配有透水板，千分表等試驗裝置。
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.
巖石測向約束膨脹試驗儀技術(shù)參數:
★千分表量程：1mm
★精 度：0.001mm
★玻璃槽長(cháng)*寬：95*95mm
★玻璃槽高度：85mm
★金屬環(huán)直徑：φ50mm
★金屬環(huán)高度：55mm
★設計試塊尺寸：φ50*20mm
★主機外形尺寸：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
巖石測向約束膨脹試驗儀試驗步驟:
★將試件放入內壁涂有凡士林的金屬套環(huán)內，在試件上下分別放置薄型濾紙和透水板。
★頂部放上固定金屬荷載塊并安裝垂直千分表。金屬荷載塊的質(zhì)量應能對試件產(chǎn)生5kPa的持續壓力。
★讀記千分表讀數，每10min讀記1次，直至3次讀數不變
★緩慢地向盛水容器內注人潔凈水，直至淹沒(méi)上部透水板。
★在第1小時(shí)內，每隔l0min測讀變形1次，以后每隔1h測讀變形1次，直至3次讀數差不大于0.001mm為止。浸水后試驗時(shí)間不得小于48h。
★試驗過(guò)程中，應保持水位不變，水溫變化不得大于2℃
★試驗過(guò)程中及試驗結束后，應詳細描述試件的崩解、掉塊、表面泥化或軟化等現象。
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.
巖石測向約束膨脹試驗儀側向約束膨脹率計算:
按下列公式分別計算巖石自由膨脹率、側向約束膨脹率、膨脹壓力
VH=△H/H *100
VD=△D/D *100
VHP=△H1/H *100
PS=F/A
式中：
VH——巖石軸向自由膨脹率(%)
VD——巖石徑向自由膨脹率(%)
VHP——巖石側向約束膨脹率(%)
Ps——巖石膨脹壓力(MPa)
△H——試件軸向變形值(mm)
H——試件高度mm
△D——試件徑向平均變形值(mm)
D——試件直徑或邊長(cháng)(mm)
△H1——有側向約束試件的軸向變形值(mm)
F——軸向荷載(N)
A——試件截面積(mm2)
巖石軸向自由膨脹率、徑向自由膨脹率、側向約束膨脹率試驗結果精確至0.1%,
巖石膨脹壓力試驗結果精確至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.
巖石測向約束膨脹試驗儀試驗記錄:
膨脹性試驗記錄應包括巖石名稱(chēng)、試驗編號、試件編號、試件描述、試件尺寸、溫度、試驗時(shí)間、軸向變形、徑向變形和軸向荷載。
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.
