Consolidation properties of dredger fill under surcharge preloading in coast region of Tianjin

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1 GLOBAL GEOLOGY Vol. 30 No. 2 Jun cm 100% ` TU447 A doi /j. issn Consolidation properties of dredger fill under surcharge preloading in coast region of Tianjin ZHANG Ying 1 WANG Qing 1 WANG Yu-jie 2 MA Jun-hua 3 YANG Jing 4 WANG Ji-liang 4 1. College of Construction Engineering Jilin University Changchun China 2. Testing Scientific Experiments Center Jilin University Changchun China 3. Shenyang Design and Research Institute Sino-coal Engineering Group Shenyang China 4. The Three Gorges Investigation Institute Co. Ltd Wuhan China Abstract Dredger fill making roads is an effective way to solve the land shortage in coastal areas. In order to quicken drainage consolidition and shorten the construction period of dredger fill taken the dredger fill in coast region of Tianjing as studied object the basic properties and subsidence characteristics of dredger fill in Tianjin were studied by water subsidence and laboratory tests without external force self-weight consolidation. The consolidation and subsidence characteristics of dredger fill in Tianjin has been obtained through the quantitative analysis of the consolidation degree and velocity and its evaluation. The results showed that the graduated compression constant amplitude waterhead inhabited the formation of low permeability soil to some extent. The consolidation degree closed to 100% when the waterhead was 45 cm. The consolidation degree was better with the closer distence from drain. The permeability decreased and the soil tended to consolidation when the accumulation load increased. Key words surcharge preloading dredger fill settlement pore water pressure consolidation properties

290 30 1 2 3 4 1 1 3 3 3 24 h 3 0. 1 cm 3 3 4 3 1 3 848.

2 h cm cm 2 51 cm cm 3 30 cm 35 cm 40 cm 45 cm 3 5 cm cm 30 cm Fig. 1 Self-made settlement instrument device

3 ~ mm 9 Table 1 1 Grain size composition of experimental soils < ~ ~ ~ ~ ~ 2 > 2 a b a. b. mm. Table 2 /% 2 Comprehensive result of physical and chemical properties of dredger fill /% W L /% W p PH Ip /19. 1 /mmol 100g - 1 /% Ip % 3 2 Fig. 2 Log curve of settlement and time 30 cm 35 cm 40 cm 45 cm 2 35 cm d d 30 cm 1 15 d

4 v = S i +1 - S i / t i +1 - t i 1 S i + 1 S i t i + 1 t i Table 3 i = Setting parameters table of consolidation degree solution α β S 1 /cm S 2 /cm S 3 /cm t 1 /min t 2 /min α = 1. 3 Fig. 3 Log curve of settlement rate and time d Fig. 4 Change of consolidation degree under whole pressure d min 35 cm U = 1 - αe -βt 2 35 cm 4 45 cm 100% 3 t 1 t 2 t 3 t 3 - t 2 = t t 1 S 1 S 2 S cm 45 cm cm

5 cm Fig % ~ 26. 3% 1. 1% ~ 4. 5% 0. 75% ~ 2. 4% 0. 91% ~ 2. 1% Change curves of pore pressure under natural settlement stage 7 Fig. 6 6 Change curves of pore pressure under seepage drainage stage Fig. 7 different load levels 6 h min 14 d 0. 2 cm ml /d 22 d d cm 45 cm Relation curves of time and displacement under

6 D SHI Xu-chao. Study on consolidation properties and deformation mechanism of marine ooze Ph'D dissertation rine soft soil J. Journal of Jilin University Earth Science Edition J D ZHANG Dan-feng DENG Hao YANG Bin. Evaluation WANG Chun-bo. Study on the solidified technology and and analysis on reinforeing soft clay foundation by pre- mechanism for hydraulic fill of Tianjin inshore new devel- loading method with accumulating load J. Underground Space and Engineering J J WU Zheng-you. In-situ observation and analysis on the ZHANG Zhong-qiong WANG Qing LI Xiao-ru et al. deposition and consolidation of pumped slurry at Lianyun- Engineering geological characters of soft soil by vacuum gang J. Port & Waterway Engineering J J LIU Ying WANG Qing. Laboratory tests for the sedimentation of dredger fill in Lianyungang area Jiangsu search on engineering geologic properties of blown PENG Tao WU Wei HUANG Shao-kang et al. Re- filled China J. Geological Bulletin of China D. D ZHU Jian-cai. Mechanism and technology of vacuum ZHANG Zhong-qiong. Research on lab simulation test of combined with surcharge preloading Ph'D dissertation quick consolidation technique for dredger fill with high clay master's degree thesis D. Changchun Jilin University D. Institude of Rock and Soil Mechanics Chinese A- cademy of Sciences cm % J d QIN Yan WANG Qing HOU Hong-ying. Study on properties of soft soil in engineering geology around vacuum 4 5 preloading J. Global Geology cm J FANG Hou-guo LIU Ping-hui XIAO Shu-fang et al. Analysis on mechanism of drain and consolidation of ma- oped area master's degree thesis D. Tianjin Tianjin Urban Construction Institute combined with surcharge pre-loading reinforcement J. Global Geology muck J. Geotechnical Investigation D. Hangzhou Zhejiang University 2004.

7 J WANG Sheng-yuan. Deformation analysis of primary consolidation and secondary consolidation of saturated soft clay J. Chinese Jounal of Geotechnical Engineering M GONG Xiao-nan. Foundation treatment manual the second edition M. Beijing China Architecture & Building Press J. SHEN Xiao-yu. Primary consolidation theory of saturated soft clay J. Earth Science J SONG Jing WANG Qing CHEN Hui-e et al. Fractal dimension of porous of heavy clay and saliniferous dredger fill during the process of consolidation J. Journal of Jilin University Earth Science Edition 檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿檿 ISSN /CN /P CA AJ E mail sjdz@ jlu. edu. cn http / /sjdz. jlu. edu. cn

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