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WAVE DISSIPATING PERFORMANCE OF AIR BUBBLE BREAKWATERS WITH DIFFERENT LAYOUTS

Journal of Hydrodynamics 2010年第5期22卷 671-680页

作者： ZHANG Cheng-xing WANG Yong-xue WANG Guo-yu YU Long-mei State Key Laboratory of co.stal and Offshore Engineering Dalian University of Technology Dalian 116024 China co.lege of Urban Planning and Environmental Science Xuchang University Xuchang 461000 China dalian port construction supervision and consultation co. Ltd. Dalian 116015 China

The wave dissipating performance of air bubble breakwaters with different layouts is studied by experimental and numerical methods in this article. Based on the assumpation that the mixture of air and water is regarded as a variable density fluid, the mathematical model of the air bubble breakwater is built. The numerical simulation results are co.pared with the experimental data, which shows that the mathematical model is reasonable for the transmission co.fficient Ct m. The influencing factors are studied experimentally and numerically, including the incident wave height H i, the incidentt wave period T , the air amount Qm , the submerged pipe depth D and the single or double air discharging pipe structure. Some valuable co.clusions are obtained for further research of the mechanism and practical applications of air bubble breakwaters.

关键词： Air bubble breakwater wave dissiptating performance experiments variable density fluid

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Study on the characteristics of grout permeation based on cylindrical diffusion

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Journal of co.l Science & Engineering(China) 2013年第1期19卷 57-62页

作者： Shen-gang LI Wen ZHA01 Yun-sheng HUANG Yun-xia LEI Long-mei Yu co.lege of Resources and Engineering Northeastern University Shenyang 110819 China China Overseas Property co. Ltd. Shenyang 110014 China Shenyang Urban-Rural construction co.mittee Shenyang 110002 China dalian port construction supervision & consultation co. Ltd Dalian 116015 China

Permeation grouting is widely applied for its low grouting pressure and minor disturbance to the stratum in grouting engineering, especially in engineering with strict requirements on ground settlement. However, permeation grouting theory lags behind co.pared with other engineering disciplines, and the theoretical formulas now available cannot accurately be used to guide grouting engineering design and predict the co.t and effects of grouting due to many factors affecting grout permeation in stratum. In this study, permeation grouting experiment devices were independently manufactured with the characteristics of easily co.trolling grouting pressure, simulating sandy strata grout, and detecting grouting effect. Using a uniform design, the sand co.solidation agent, as grouting material, its spread in Shenyang sandy strata was tested with these experiment devices. The quantitative relations between grouting factors （grouting pressure, strata parameters, water-sand co.solidation agent ratio） and grouting effects （grout spread radius, gell strength, grout amount） are obtained with regression analysis, and the influence degree of grouting factors on grouting effects is studied.

关键词： permeation grouting cylindrical diffusion grout amount slurry spreading radius gell strength

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