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<br />~~ FIG. 0. Depths of TDR-Measured Rock-Mass Movement, Relative Locallon of
<br />Longwall Face and Assoclaled Strallgraphy
<br />nac
<br />House g JOa
<br /> Holo Location
<br />^ for TDR Cablo ~
<br /><
<br />\V
<br />/
<br />
<br />6
<br />u 2oa
<br />w 6 5
<br />>
<br />\ $ 10C
<br />210 205 200 195 190
<br />73 60
<br />o
<br />m ~
<br /> I
<br />150 II
<br /> ~ 6 .la[
<br /> I
<br />50 m ° za
<br />•
<br />FIG. 2. Hole Locallon and Mining Sile Map that Shows Underground Works, Long-
<br />wall-Face Locallon, Dale, and Surface Culture
<br />lance indicators, marked as (d), improve location accuracy of ntcastne-
<br />ntenlx. Waveform I (May 2;t, IU:4fi) is the firs) signalurc recorded alter
<br />able insLdlalion. This record serves as the benchmark against which other
<br />signals arc compared. Waveforms 2 (.lone 12, IG:.lS), } (.lone 11, 7:21), ;uul
<br />4 (June 13, IG:2S) wcrc rcatnled before, al, :Ind :Ifler complete sevcl:utce
<br />al a depth of Gfi m (217 fl ). In a similar fashion, wave (Dons S (.tune 14.
<br />I1:17), 6 (June I-0, IG:27), and 7 (Jmlc I.1, 211ah) wcrc recut ded before,
<br />al, and after wmpletc severance al a depth of d8 m (158 fl).
<br />Time Variation of Morcutcnl
<br />• Pig. 6 compares the lime variation of the reflection signahues al Jhc
<br />severance locations (depths GG m and dpi m) with surface scnlcntcnls al the
<br />1416
<br />J00
<br />.loco ~soo o sao loco ,soo
<br />Tlmo Sirxo Cablo InslallaE (Mms)
<br />FIG. 4. Longwall Face Advance Relarlve to Cable Inslallallon In Terms o1 Dlslance
<br />and Time
<br />l~l)IL cable-bolt collar as mining progressed luwanl the cable. 'Che initial
<br />readings provide the baseline (ur subscyucnl observations.
<br />"fhc cable was installed on May 23, 1991 and polled remotely on May 28
<br />as shown in Pig. fi. There was no signalurc change between May 28 and the
<br />next leading on May 29. Between May 30 and .tune 3 the sysJCm undd nut
<br />be accessed due to interruption of declricll service caused by a lhunder-
<br />slunu. 'I~hc su rfacc nu nnuncnts wcrc not sw vcycd bchvccn May 23 and
<br />June 8.
<br />As dcmonsl rated in Pig. G, dclcclion of su bsurfacc movement by TDR
<br />some four days before dclcclion al Jhe su r(ace demonstrates the carly-
<br />warning capability of the "1'DR system. On .tune 4, remote polling showed
<br />a signalurc rc(Icchon al a depth of GG nt. This spike progressively enlarged
<br />~
<br />1r~1
<br />
<br />a q~ Fnco UndmMe Cablo
<br />° 9A~
<br />tore
<br />
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