The present invention discloses a device for measuring dynamic evolution of a three-dimensional disturbed stress under mining disturbance, comprising an outer steel cylinder. Three three-direction sensing units are arranged on the outer steel cylinder. Any two of three stress measurement directions of each three-direction sensing unit are perpendicular to each other. Nine stress measurement directions of the three three-direction sensing units are different. The present invention also discloses a method for measuring dynamic evolution of a three-dimensional disturbed stress under mining disturbance. In the present invention, stresses are measured from three perpendicular directions which are inclined, so the difficulty in measuring a three-dimensional stress in a borehole is overcome; and a spatial stress value is measured by three three-direction sensing units, and thus the size and direction of a disturbed principal stress in the borehole are calculated.

A hose for use with a blower and an underground vault. The hose surviving an explosion initiated inside the underground vault. The hose is blast-resistant, arc-flash-resistant, and fire-resistant. A first end of the hose is connectable to the blower and configured to receive fresh air from the blower when connected thereto. The hose conducts the fresh air to a second end of the hose. The second end is positionable inside the underground vault wherein the fresh air provides sufficient breathable air to any personnel present in the underground vault.

A hose for use with a blower and an underground vault. The hose surviving an explosion initiated inside the underground vault. The hose is blast-resistant, arc-flash-resistant, and fire-resistant. A first end of the hose is connectable to the blower and configured to receive fresh air from the blower when connected thereto. The hose conducts the fresh air to a second end of the hose. The second end is positionable inside the underground vault wherein the fresh air provides sufficient breathable air to any personnel present in the underground vault.

The invention relates to a power cable comprising at least one conductor element (10) and which additionally comprises at least one strip (16) arranged on at least one portion of the length of said conductor element (10). The strip (16) is equipped with a winding-free energy recovery system which supplies the strip (16) with electric current from the energy available in the conductor (10). The strip (16) has a plurality of elements (18) which generate light from this electric current.

The invention relates to a power cable comprising at least one conductor element (10) and which additionally comprises at least one strip (16) arranged on at least one portion of the length of said conductor element (10). The strip (16) is equipped with a winding-free energy recovery system which supplies the strip (16) with electric current from the energy available in the conductor (10). The strip (16) has a plurality of elements (18) which generate light from this electric current.

An impact panel for protecting mining equipment may include a plurality of ceramic tiles affixed to a base plate. The impact panel may further include at least one fixing hole disposed within the plurality of ceramic tiles and the base plate with a metal frame disposed around an outer peripheral edge of the plurality of ceramic tiles that is also affixed to the base plate. The impact panel may have at least one plug disposed inside the at least one fixing hole to seamlessly cover the at least one fixing hole. The panels may also be wired with sensors that will communicate with process control circuits allowing data collection on remote process and remote mining equipment.

An impact panel for protecting mining equipment may include a plurality of ceramic tiles affixed to a base plate. The impact panel may further include at least one fixing hole disposed within the plurality of ceramic tiles and the base plate with a metal frame disposed around an outer peripheral edge of the plurality of ceramic tiles that is also affixed to the base plate. The impact panel may have at least one plug disposed inside the at least one fixing hole to seamlessly cover the at least one fixing hole. The panels may also be wired with sensors that will communicate with process control circuits allowing data collection on remote process and remote mining equipment.

A method for real-time strength estimation, grading, and early warning of rock mass in tunnel boring machine (TBM) tunneling, and belongs to the technical field of TBM tunnel construction. The method includes the following steps: establishing a general relation model of equivalent strength R.sub.ec of the TBM boring rock mass and a field penetration index (FPI); and applying the model to TBM boring construction, estimating an integrity coefficient K.sub.v of the TBM boring rock mass in real time according to boring parameters acquired by a TBM in real time, and performing grading and early warning on the TBM boring rock mass according to a given grading standard and early warning values.

A method for real-time strength estimation, grading, and early warning of rock mass in tunnel boring machine (TBM) tunneling, and belongs to the technical field of TBM tunnel construction. The method includes the following steps: establishing a general relation model of equivalent strength R.sub.ec of the TBM boring rock mass and a field penetration index (FPI); and applying the model to TBM boring construction, estimating an integrity coefficient K.sub.v of the TBM boring rock mass in real time according to boring parameters acquired by a TBM in real time, and performing grading and early warning on the TBM boring rock mass according to a given grading standard and early warning values.

Provided are a protecting trolley and a construction method of rock burst prewarning protection system in non-contact tunnel construction. The protecting trolley includes a framework, a walking assembly, a rockfall buffering assembly, a spraying assembly and a rock burst prewarning system. The rockfall buffering assembly includes an arch frame in a fixed connection with the framework and a protecting net fixed on the arch frame. The spraying assembly includes a track car in connection with the rockfall buffering assembly and a spraying hose fixed on the track car, and the spraying hose sprays towards the surrounding rock. The rock burst prewarning assembly includes a thermosensitive infrared sensor used for detecting the temperature of the surrounding rock and a highly sensitive laser sensor used for detecting the deformation of the surrounding rock.