A chain event of the 2016 Kumamoto earthquakes caused considerable geotechnical damage related to liquefaction in many places around Kumamoto plain. Many low-rise houses and traditional Japanese style houses, which we...A chain event of the 2016 Kumamoto earthquakes caused considerable geotechnical damage related to liquefaction in many places around Kumamoto plain. Many low-rise houses and traditional Japanese style houses, which were constructed on <span style="font-family:Verdana;">shallow</span><span style="font-family:Verdana;"> foundation, suffered differential settlement and tilting due to liquefaction. To mitigate the building damages due to the liquefaction</span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">, a new countermeasure method of jet grout grid form with a horizontal slab is introduced in this study.</span></span></span><span><span><span><span style="font-family:""><span style="font-family:Verdana;"> The effectiveness of the proposed technique was evaluated through physical </span><span style="font-family:Verdana;">modelling</span><span style="font-family:Verdana;"> and numerical </span><span style="font-family:Verdana;">modelling</span><span style="font-family:Verdana;">. As </span></span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">a </span></span></span></span><span><span><span><span style="font-family:""><span style="font-family:Verdana;">part of the physical </span><span style="font-family:Verdana;">modelling</span><span style="font-family:Verdana;">, a set of 1 g shaking table tests for </span><span style="font-family:Verdana;">unimproved</span><span style="font-family:Verdana;"> case and improved case were performed, in which the mitigation effects of the grid form with a horizontal reinforcing slab were examined based on the acceleration, excess pore water pressure ratio as well as ground settlement. Numerical simulation was also performed for assessing the effect of </span><span style="font-family:Verdana;">improved</span><span style="font-family:Verdana;"> method on soil-structure interaction and building </span><span style="f展开更多
The number of marine landfills in Japan has increased over the past decade due to the lack of suitable land. For marine landfills, protection of the alluvium clay layer and improvement of the drainage performance in w...The number of marine landfills in Japan has increased over the past decade due to the lack of suitable land. For marine landfills, protection of the alluvium clay layer and improvement of the drainage performance in waste inflow are important aspects. In this paper, an economical construction method for these problems is proposed using gravel-tire chips mixture (GTCM) as the horizontal reinforcement and drainage medium beneath the waste. The content and particle size of tire chips mixed with gravel are essential factors that affect the bearing capacity and permeability of the reinforcement layer. Therefore, a series of permeability tests are conducted using newly developed large-scale triaxial compression and permeability test apparatus to investigate the effect of tire chips particle size, the mass proportion of tire chips (MPTC), and triaxial stress on the permeability of GTCM. In addition, the effectiveness of this technique is evaluated by numerical simulations. The experimental results confirm that the shear strength of GTCM is influenced by tire chips content. Furthermore, permeability coefficient of GTCM is on the order of 0.02 cm/s to 0.08 cm/s, which is higher than the tolerable level of permeability of drainage layer in landfills. GTCM sample shows excellent permeability even on higher compression. Moreover, the Non-Darcy flow properties of GTCM (non-linear) are introduced in this study, and an approximate power function relationship between the permeability coefficient and the non-Darcy flow coefficient is developed. The numerical results confirm that GTCM performs better than the sand, a traditional reinforcement material.展开更多
文摘A chain event of the 2016 Kumamoto earthquakes caused considerable geotechnical damage related to liquefaction in many places around Kumamoto plain. Many low-rise houses and traditional Japanese style houses, which were constructed on <span style="font-family:Verdana;">shallow</span><span style="font-family:Verdana;"> foundation, suffered differential settlement and tilting due to liquefaction. To mitigate the building damages due to the liquefaction</span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">, a new countermeasure method of jet grout grid form with a horizontal slab is introduced in this study.</span></span></span><span><span><span><span style="font-family:""><span style="font-family:Verdana;"> The effectiveness of the proposed technique was evaluated through physical </span><span style="font-family:Verdana;">modelling</span><span style="font-family:Verdana;"> and numerical </span><span style="font-family:Verdana;">modelling</span><span style="font-family:Verdana;">. As </span></span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">a </span></span></span></span><span><span><span><span style="font-family:""><span style="font-family:Verdana;">part of the physical </span><span style="font-family:Verdana;">modelling</span><span style="font-family:Verdana;">, a set of 1 g shaking table tests for </span><span style="font-family:Verdana;">unimproved</span><span style="font-family:Verdana;"> case and improved case were performed, in which the mitigation effects of the grid form with a horizontal reinforcing slab were examined based on the acceleration, excess pore water pressure ratio as well as ground settlement. Numerical simulation was also performed for assessing the effect of </span><span style="font-family:Verdana;">improved</span><span style="font-family:Verdana;"> method on soil-structure interaction and building </span><span style="f
文摘The number of marine landfills in Japan has increased over the past decade due to the lack of suitable land. For marine landfills, protection of the alluvium clay layer and improvement of the drainage performance in waste inflow are important aspects. In this paper, an economical construction method for these problems is proposed using gravel-tire chips mixture (GTCM) as the horizontal reinforcement and drainage medium beneath the waste. The content and particle size of tire chips mixed with gravel are essential factors that affect the bearing capacity and permeability of the reinforcement layer. Therefore, a series of permeability tests are conducted using newly developed large-scale triaxial compression and permeability test apparatus to investigate the effect of tire chips particle size, the mass proportion of tire chips (MPTC), and triaxial stress on the permeability of GTCM. In addition, the effectiveness of this technique is evaluated by numerical simulations. The experimental results confirm that the shear strength of GTCM is influenced by tire chips content. Furthermore, permeability coefficient of GTCM is on the order of 0.02 cm/s to 0.08 cm/s, which is higher than the tolerable level of permeability of drainage layer in landfills. GTCM sample shows excellent permeability even on higher compression. Moreover, the Non-Darcy flow properties of GTCM (non-linear) are introduced in this study, and an approximate power function relationship between the permeability coefficient and the non-Darcy flow coefficient is developed. The numerical results confirm that GTCM performs better than the sand, a traditional reinforcement material.
