Assignment Detail:- SVY2302 Mine Surveying - University of Southern Queensland
Underground Surveying Problems
Question 1: As Mine Surveyor of an underground mine you have been instructed to design a tunnel to join a crosscut to a haulage drive- The details of the crosscut and drive are shown below-
Crosscut
Bearing:
61°06'25"
Grade:
1:50
Last Survey Station:
5417-744 E
2448-954 N
1099-439 RL Floor
Haulage drive
Bearing:
321°43'10"
Grade:
-1:100
Last Survey Station:
5594-088 E
2384-402 N
1107-549 RL Floor
The face of the crosscut is 80m ahead of the last station- Both the crosscut and haulage drive are 5m wide and 4m high-
The tunnel is to have a circular horizontal alignment turning right from the crosscut with a radius of not more than 50m and not less that 30m with a maximum grade of 1 in 10-
a- Calculate the co-ordinates of the two tangent points for the most cost effective solution- b- Plot the crosscut and drives at suitable scale showing all relevant information- Show the proposed walls as dashed lines on the plan- c- Calculate the co-ordinates of a point -STN 45- that is 5m along the centreline of the tunnel from the TP in the crosscut -TP1-- Check your calculations using the plan-d- From this point -STN 45- a chord line bearing 82°43' is to be set out- At 2m intervals calculate the centreline offsets from this line and reduced levels of the floor- e- At what chainage from STN 45 should mining cease and why????
Question 2:
To establish horizontal control on a new level the surveyor has traversed between two single wires hung in separate shafts-
The surveyor has set up the instrument at IS100 sighted to Wire X and has installed and made observations to wall stations WS150 and WS151- The observations at IS1000 are as follows-
To
Wire X
FL
215°44'30"
25-382
FR
35°44'16"
WS150
FL
60°19'45"
39-838
FR
240°19'31"
WS151
FL
67°14'48"
115-986
FR
247°14'56"
The surveyor then sets up at IS101 observed to the wall stations as well as WireY- The observations at IS101 are as follows-
To
WS150
FL
254°26'41"
121-766
FR
74°26'53"
WS151
FL
262°56'09"
45-983
FR
82°56'17"
Wire Y
FL
115°18'40"
38-340
FR
295°18'32"
a- Calculate the final adjusted co-ordinates for the two wall stations WS150 and WS151- Outline your steps clearly-
Question 3
The Falk underground coal mine has been mining the Hero seam which is a 4m high steaming coal, and the 3m high Devil seam, which is high grade soft coking coal, to allow blending and to produce coal for extra marketing potential-
It is proposed to join the present workings in the Hero seam with the workings in the Devil seam with a curved drive through the rock to allow vehicular access between the workings- The interburden is competent sandstone-
All survey stations are in the roof- The grades of both existing drives can be regarded as consistent-
Survey data is as follows:
Workings in Hero Seam
Survey Station
Easting
Northing
RL
Location
FH337
3402-123
4239-437
767-921
On heading centreline at the present face
FH336
3526-326
4174-498
772-919
On heading centreline
Workings in Devil Seam
Survey Station
Easting
Northing
RL
Location
FD113
3212-396
4125-585
758-881
On heading centreline at the present face
FD112
3179-369
3942-687
757-592
On heading centreline
The proposed drive will be 3m high and 5m wide, drivage to start at the floor at FH337- Mined material will be loaded out and dumped in back headings in the Hero workings-
The proposed drive will be a circular curve with a tangent at FH337 and tangential to centreline FD112 - FD113- Grade is to be consistent from FH337 to FD113-
a- Design the proposed drive- Calculate the radius and length of drivage-
b- Calculate where the drive meets the centreline FD112 - FD113 -the coordinate of TP--
c- Calculate the grade of the drive to meet the floor of the Devil seam at FD113-
d- Plot the drive plan showing all relevant information -show the proposed walls as dashed lines on the plan--
e- Calculate the total volume of material to be mined-
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