A device and method for measuring principal stress of surrounding rock stress field
A technology of surrounding rock stress and stress, which is applied in the direction of measuring devices, force sensors in the holes of stressed structures, force/torque/power measuring instruments, etc., can solve the problem of heavy measurement workload, long time required and cumbersome operation and other issues to achieve the effect of improving accuracy, reducing construction period and time, and saving time
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Embodiment 1
[0037] like Figure 1-4 As shown, a device for measuring the principal stress of the surrounding rock stress field, it includes a borehole 1 arranged on the surrounding rock mass to be measured, the bottom position of the borehole 1 is poured with plain cement slurry 3, and the plain cement slurry 3 The upper drill hole 1 is provided with a cylindrical reinforcing body 2 inside, and the outside of the cylindrical reinforcing body 2 is wrapped with a flexible wrapping layer 7, and the inside of the flexible wrapping layer 7 is wrapped with an annular fine wire mesh 9 of high-strength metal balls 8, A pressure sensor 10 is arranged between the ring-shaped fine wire mesh 9 and the wall of the borehole 1, and a conical loading head 4 is arranged at the end of the cylindrical force applying body 2, and the center of the bottom end surface of the conical loading head 4 is A dowel bar 11 is welded at the position, and the other end of the dowel bar 11 is connected with a loading bar ...
Embodiment 2
[0049] The measuring method of the device for measuring the principal stress of surrounding rock stress field described in any one, it comprises the following steps:
[0050] Step1: Drilling parallel to the ground: select a bare bedrock to drill on the tested rock wall and grind the hole wall to make it as smooth as possible;
[0051] Step2: Equipment preparation:
[0052] 1 Pour an appropriate amount of plain cement slurry inside the borehole 1;
[0053] 2. Setting of equipment and instruments inside the borehole 1: the pressure sensor 10 connected to the pressure acquisition instrument is arranged inside the borehole 1, and then inserted into the annular fine wire mesh 9 wrapped with a flexible wrapping layer 7 and a high-strength metal ball 8 inside. Cylindrical reinforcing body 2, and grouting pipe 6 is set, and then the tapered loading head 4 is wrapped inside it; the amount of expansion mud required is calculated in advance through the standard fracturing pressure of th...
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