Distributed method for measuring moisture content of soils based on C-DTS

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1 DOI /CJGE14515 C-DTS C-DTS C-DTS T t T t w DTS DTS TU441.3 A 14548(14)5916 (1988 ) caodigfeg1@163.com Distributed method for measurig moisture cotet of soils based o C-DTS CAO Dig-feg 1, SHI Bi 1, YAN Ju-fa 1, WEI Guag-qig (1. School of Earth Scieces ad Egieerig, Najig Uiversity, Najig 146, Chia;. Suzhou NaZee Sesig Techology Co., Ltd., Suzhou 1513, Chia) Abstract: Based o the carbo-fiber-heatig-cable distributed temperature sesig system (C-DTS), a ew distributed method for measurig the moisture cotet of soils is proposed. The temperature of soil-buried-cable is measured by C-DTS i this method. The moisture cotet of soils is determied by the relatioship betwee the temperature characteristic value (T t ) ad the moisture cotet. T t is defied, ad it is proved that there is a liear relatioship betwee the moisture cotet ad T t. The relevat parameters ca be determied by calibratio experimet. The experimetal results show that the moisture cotet of soils ca be measured effectively through artificial heatig carbo-fiber-cable, ad the usage of DTS provides distributed measuremet. The accuracy of this method is related to the sectio of T t. The success of the proposed method provides a very advaced distributed approach for measurig the moisture cotet of soils. Further improvemet ad popularizatio are required. Key words: soil; moisture cotet; DTS; carbo fiber heatig optical cable; distributed sesig [1-3] 3 TDR [4-5] TDR 1BAK1B CB *

2 5. C-DTS 911 Dalto 1984 [6] 3 a [7] [8] 3 ROTDR DTS [9-11] [1] TDR C-DTS C-DTS C-DTS C-DTS C-DTS [ t 1 t ][ t 1 t ] T t T t i1 ( Ti ) (1) T t T i [ t 1 t ] T t w T t w U Q1 I R () R Q 1 U R I R I Q 1 [13] T Q (3) u Q T u Q3 Q1 Q ( T T), (4) Q 3 c m T T 4 T I R( T T) (5) 5 I R T T (6) T T T u u u T 6 u ktb (7) k b T u I R T T T u u k b

[14-15] 4 I v RT ( ) e IS vs hcv F F KT (14) R(T)I F IS v F v S c v h K T ct X (15) 1415

3 91 14 w s (8) w s w w w aw (9) a w 79 k s b w T (1) a a a wkt 1 b1 (11) k s b k1 b1 k 1 b 1 a a a ( T ) i i1 w k b (1) wktt b (13) k b 13 T t w k b C-DTS DTS ROTDR ROTDR [14-15] 4 I v RT ( ) e IS vs hcv F F KT (14) R(T)I F IS v F v S c v h K T ct X (15) 1415 C-DTS C-DTS NZS-DTS-C11 1 NZS-DTS-C11 Fig. 1 Diagram of NZS-DTS-C11 C-DTS C-DTS 4 DTS T T T t Tt w w

4 5. C-DTS V/m 18 mi PVC C-DTS Fig. Workig process of C-DTS system C-DTS w T t wktt b k b T t 3 C-DTS PVC Fig. 3 Basic cofiguratio of tests DTS DTS NZS-DTS-M6 1 m.1 6 km 3 mm 19.4 Ω/m 5 PVC.7 m m 4 PVC PVC DTS Fig. 4 Istallatio process of test device [13] d 1.13 mm d 6.9 mm 1.1 g/ 3 w sat.9%.3.9% 5%1%15%% C-DTS T T t m DTS 1 m mi 3 mi

5 Fig. 5 Time-history curves of heatig of measurig tube uder differet moisture cotets T t w [ t 1 t ] t 1 t t mi 6 Fig. 6 Relatioship betwee T t ad w of soils at differet time..itervals 6 6 T t w w3 6 mi.514tt 3.83 w3 9 mi.553tt w3 1 mi.5648tt 33.5 (16) w3 15 mi.6819tt w3 18 mi.74tt C-DTS C-DTS C-DTS 13 C-DTS C-DTS C-DTS 8% mi 16 1 Table 1 Compariso of moisture cotets calculated by T t at differet time itervals /mi /% /mi /% mi 18 mi 3 mi 5% C-DTS [5%w sat ]

6 5. C-DTS 915 C-DTS T t w 5 1 DTS T t w ktt b C-DTS mi 4 C-DTS mm 5C-DTS [5%w sat ] 5% C-DTS [1] QI Jia-feg, SONG Xue-li, LIU Ji-chao. A study o the effects of water cotet o stregth parameters of ladslide soil[j]. Applied Mechaics ad Materials, 1, 17173: [] NIAN Tig-kai, FENG Zhog-kai, YU Peg-cheg, et al. Shear test o mixed slide-zoe soils of ladslide uder differet water cotet[j]. Advaced Materials Research, 11, 31: [3] WANG Cheg-liag, BAI Mig-zhou, KUANG Xig. Study o risk assessmet method of water burstig disaster i railway tuel[j]. Applied Mechaics ad Materials, 11, 9: [4] DAILY W, RAMIREZ A, LABRECQUE D, et al. Electrical resistivity tomography of vadose water movemet[j]. Water Resources Research, 199, 8(5): [5] FRIEDMAN S P. Soil properties ifluecig apparet electrical coductivity: A review[j]. Computers ad Electroics i Agriculture, 5, 46(1): 457. [6] DALTON F N, HERKELRATH W N, RAWLINS D S, et al. Time-domai reflectometry: Simultaeous measuremet of soil water cotet ad electrical coductivity with a sigle probe[j]. Sciece, 1984, 4(465): [7] WOJCIECH S, ANDRZEJ W, OLGA A, Calibratio of a TDR probe for low soil water cotet measuremets[j]. Sesors ad Actuators, 8, 147(): [8] SKIERUCHA W. Accuracy of soil moisture measuremet by TDR techique[j]. Iteratioal Agrophsics,, 14: [9] HU Chua-log, WANG Jig-feg, ZHANG Zai-xua, et al. Research o distributed temperature sesor(dts) applied i udergroud tuel[c]// 11 Iteratioal Coferece o Optical Istrumets ad Techology: Optical Sesors ad Applicatio, 11, 8199(16): 16. [1] ZHANG Xi, FAN Tia-a. The research of distribute temperature moitorig system early warig fire i coal belt coveyor[j]. Advaced Materials Research, 1, 548: [11] GROSSWIG S, HURTIG E, KÜHN K, et al. Distributed fiber-optic temperature sesig techique(dts) for surveyig udergroud gas storage facilities[j]. Oil Gas Europea Magazie,, 7(4): [1] COTÉ A, CARRIER B, LEDUC J, et al. Water leakage detectio usig optical fiber at the periboka dam[j]. Geotechical Special Publicatio, 7, 175(59): 11. [13]. [M]. 8 (WANG Xiao-dog. Trasferts thermiques[m]. Dalia: Dalia Uiversity of Techology Press, 8 (i Chiese)) [14],. [J].,, 15(): (LIN YU-la, CHEN Yog-tai. Desig of a rama scatterig distributed optical fiber temperature sesor[j]. Optoelectroic Techology & Iformatio,, 15(): (i Chiese)) [15]. BOTDR [D]. :, 4. (ZHANG Da. BOTDR-based distributed optical fiber sesig ad its applicatio ito egieerig health moitorig[d]. Najig: Najig Uiversity, 4. (i Chiese))

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