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                                              Determination of rock disintegration index
                                              作者:管理員    發布于:2019-09-02 15:29:18    文字:【】【】【
                                              Determination of rock disintegration index
                                              First, the purpose of the experiment
                                              1. Understand the method for determining the rock disintegration index.
                                              2. Determine the amount of disintegration, disintegration index, disintegration time and disintegration of the rock under certain conditions.
                                              Second, the experimental principle
                                              Many types of rocks, especially those with high clay content, are prone to disintegration and spalling under the short-term effects of short-term humidity and air drying. This experiment is to simulate the natural wetting and drying process of rock by artificial mechanical means. After the cycle, the hard rock can also undergo three or more standard cycles, and the rock sample exhibits resistance to softening and disintegration.
                                              We call it the fracture resistance of rock.
                                              Third, experimental equipment, instruments
                                              1. The anti-disintegration instrument consists of a transmission device, a test cylinder and a water tank. The cylinder has a diameter of 140 mm and is surrounded by a 2 mm standard mesh. The transmission consists of a motor and a gearbox. The rotation speed is 20 rpm; the tank volume is 150×150×120 mm, and a test cylinder with horizontal shaft support and free rotation is installed therein; the device is as shown in the following figure.
                                              2, balance: weighing 1000g, the amount of 0.1g
                                              3, oven
                                              4, dryer
                                              Fourth, the test piece specifications and quantity
                                              The shape of the test piece is roughly spherical, without angular edges. The quality of each test piece is between 40 and 60 grams, and 10 representative test pieces are selected for each group.
                                              V. Measuring methods and procedures
                                              1. Select the test piece, check the name and number of the test piece, and fill it in the record form.
                                              2. The test piece is placed in a clean cylinder, and then the cylinder is placed in an oven at a temperature of 105 to 110 ° C for 24 hours, and then taken out to cool to room temperature, and the total mass m0 of the cylinder and the test piece is weighed.
                                              3. Place the cylinder and test piece in the water tank and connect the transmission.
                                              4. Inject tap water into the water tank (generally tap water of 20 °C). The water level should be 20mm below the axis of the cylinder. Turn on the motor and turn the cylinder at 10 rpm for 10 min. The calculation accuracy is 0.5 min.
                                              5. Take the cylinder out of the sink and place the cylinder and the remaining test piece in the oven.
                                              Bake at a temperature of 105 to 110 ° C for 24 hours, and after cooling, weigh the mass of the cylinder plus the residual test piece m1;
                                              6, repeat 3 to 5 procedures, and then weigh the cylinder plus the mass of the residual test piece m2;
                                              7. Pour out the residual test piece in the cylinder, wipe the cylinder, and call the cylinder mass m3.
                                              Sixth, calculation and finishing
                                              Calculate the rock fracture resistance index according to the following formula:
                                              Where: Id1, Id2 - first and second resistance to disintegration index (%);
                                              M0——the mass of the test piece before the disintegration (g);
                                              M1——the mass of the residual test piece after the first disintegration (g);
                                              M2——the mass of the residual test piece after the second disintegration (g);
                                              M3 - the mass of the cylinder (g).
                                               
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                                              五月丁香六月综合缴情在线
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