摘要:
A tension meter of an anchor rod with constant resistance and large deformation comprises a pull rod and a hollow jack. The meter further includes: a rotation device for controlling the rotation angle of the hollow jack; a lifter for adjusting the height of the hollow jack and the rotation device; a first hydraulic pump for driving the hollow jack, wherein the hollow jack is fixed on the rotation device mounted on the lifter. The meter has a large measurement range and a high load capacity.
摘要:
A tension meter of an anchor rod with constant resistance and large deformation comprises a pull rod and a hollow jack (13). The meter further includes: a rotation device for controlling the rotation angle of the hollow jack (3); a lifter for adjusting the height of the hollow jack (13) and the rotation device; a first hydraulic pump (1) for driving the hollow jack (13), wherein the hollow jack (13) is fixed on the rotation device mounted on the lifter. The meter has a large measurement range and a high load capacity.
摘要:
A dynamics performance testing system, for use in testing the dynamics performance of an anchor rod or an anchor rode, comprising a main machine and a measurement and control system. The main machine comprises a vertical machine frame (1), a clamping apparatus (3) arranged on the top of the vertical machine frame (1) and used for vertically clamping the top end of a sample (6), where the sample (6) is provided at the bottom end thereof with a tray (61), a drop-hammering apparatus (2) used for being dropped vertically from the vertical machine frame (1) at a set height to impact the tray (61), a lifting apparatus used for lifting the drop-hammering apparatus at the bottom of the vertical machine frame (1) to the set height, and a protection apparatus used for physical protection and isolation to reduce bodily injury and noise. The measurement and control system controls the drop-hammering apparatus to select a parameter for drop-hammering and a process of lifting and dropping. The real-time impact on the tray (61) when the drop-hammering apparatus is dropped vertically is sensed by a force sensor, while real-time impact data received from a sensor device is analyzed, and a test result is outputted. The dynamics performance testing system is provided with versatility while the test result is accurate and reliable.
摘要:
An experimental method for simulating an impact rock-burst, comprises the following steps: making a rock sample having a through hole or a half hole; loading initial static stresses of three directions onto the rock sample; then loading dynamic load(s) by 0.5-10 minutes, to determine whether a spalling phenomenon appears on an internal surface of the hole; if appears, and the rock sample is further damaged, determining and recording a failure course, if not appears, increasing the static stress(es) or the intensity of the dynamic load, then repeating the experiment procedure as far as rock sample goes into the failure course, then determining and recording the failure course, and ending the expierment. The impact rockburst induced by dynamic load is simulated on the rock sample successfully, and by studying mechanical mechanisms of the rock-burst, the present application lays foundations for gradually understanding and mastering the nature of real rock burst.
摘要:
An experimental method for simulating an impact rock-burst, comprises the following steps: making a rock sample having a through hole or a half hole; loading initial static stresses of three directions onto the rock sample; then loading dynamic load(s) by 0.5-10 minutes, to determine whether a spalling phenomenon appears on an internal surface of the hole; if appears, and the rock sample is further damaged, determining and recording a failure course, if not appears, increasing the static stress(es) or the intensity of the dynamic load, then repeating the experiment procedure as far as the rock sample goes into the failure course, then determining and recording the failure course, and ending the expierment. The impact rockburst induced by dynamic load is simulated in the rock sample successfully, and by sudying mechanical mechanisms of the rock-burst, the present application lays foundations for gradually understanding and mastering the nature of real rock burst.
摘要:
A constant-resistance large-deformation anchor rod includes a rod body (6), a tray (3), a nut (2), and a constant-resistance device (4). The constant-resistance device (4) is formed into a cylindrical structure, and the inner surface of the constant-resistance device (4) and the outer surface of the rod body (6) are both formed with thread structures. The constant-resistance device (4) is sleeved at the tail of the rod body (6), and the tray (3) and the nut (2) are sequentially sleeved at the tail of the constant-resistance device (4). The nut (2) is in threaded connection with the constant-resistance device (4). The constant-resistance large-deformation anchor rod in the invention can be automatically stretched when the tunnel surrounding rock deforms largely, and keep the constant working resistance.
摘要:
A system and method for testing gas migration process in the coal and rock mass are disclosed. The method includes the following steps: selecting a cylindrical coal sample, applying an axial pressure and a radial pressure to the coal sample under a sealing state, and/or increasing temperature, to desorb gas absorbed by the coal sample; guiding the gas desorbed from the coal sample by a guiding passage, detecting gas flow rate and pressure, analyzing gas composition and content, and achieving a data statistics. The method provides a theory and data basis for researching the forming and occurring process of gas outburst accident in coal mine. The system is simple and easy to use, and is suitable for migration research of the gas absorbed in the deep coal-rock mass.
摘要:
A fractured roof 110 mining method entry-side anti-collapsed structure, one working face of the 110 mining method corresponds to one roadway but without retaining any coal pillar, the roadway retains an entry after the previous working face implements mining top-cutting pressure release, and a roof of the roadway is arch-shape, directional cutting is conducted on one side of the roadway, and the cutting angle is between 15-20 degrees. One working face corresponds to one roadway but without retaining any coal pillar when underground mining is conducted, which can save resources and improve recovery rate of mining. And, the roof of the roadway of the retained entry is arch-shaped, which can improve safety and ensure safety of the coal mining working face. In addition, a cutting angle is 15-20 degrees, which can effectively determine a roof caving direction after top-cutting and reduce affect to the retained entry.
摘要:
A processing method of NPR steel rebar coil is disclosed. The NPR steel rebar is cold processed and has a diameter of less than 14 mm, and has a yield strength of 800˜950 MPa, a tensile strength of 900˜1100 MPa, and a elongation of not less than 20%. The processing method comprises: an I-shaped placing step L20, an uncoiling step L30, a flattening step L40, a pointing step L50, a butt welding step L60, a hydraulic head-pushing step L70, a cold drawn smoothing step L80, a grit blasting step L90, an in-situ inline annealing step L10, an air-cooled tempering step L11, a coiling step L12, a placing step L13, a flattening step L14, a cold drawn spiral ribbing step L15, a straightening step L16, and a coiling step L17. The method can achieve full intelligence, meet the processing requirements and the automatic intelligent production requirements of NPR steel rebar coil.
摘要:
A processing method of NPR steel rebar rod is disclosed. The NPR steel rebar is cold processed and has a yield strength of 800˜950 MPa, a tensile strength of 900˜1100 MPa, and a percentage elongation at maximum force of not less than 10˜40%. The processing method comprises the following steps: a I-shaped placing step L20, an uncoiling step L30, a flattening step L40, a butt welding step L50, a sandblasting step L60, a straightening step L70, a pointing step L80, a hydraulic head-pushing step L90, a cold drawn spiral ribbing step L10, a straight forward continuous wire drawing and traction step L11, a pre-straightening step L12, a fine straightening step L13, and a cutting-off step L14. The processing method can meet the automatic intelligent production requirements of NPR steel rebar, cold rolled spiral NPR steel rebar, and pre-stressed NPR steel rebar.