A simple numerical method has been proposed to predict tilting and settlement of detached house due to ground liquefaction. SPH (Smoothed Particle Hydrodynamics) scheme was used for this object. In order to confirm the validity of the proposed numerical tool, we carried out a numerical simulation for the model shaking table test. Low noise and low vibration construction machine was then manufactured to satisfy the performance requirements for the construction in urban residential areas. The special designed drain pipe was used as a drainage pipe for the proposed countermeasure.
Ground liquefaction took place on landfill site and loose sandy ground during earthquakes in Japan. Some detached houses had severe damages with tilting and settlement (JGS, 2011; Tokimatsu and Katsumata, 2012; Yamaguchi et al., 2012; Huang and Yu, 2013). Many different types of liquefaction countermeasures have been proposed and applied to infrastructures. Those countermeasures cannot be utilized to detached house because machines used are too large to use in a narrow space between neighboring detached houses and the high cost. Noise and vibration levels should be also lowered to conform to the environmental standards in urban residential areas (Nagai et al., 2016; Mano et al., 2018). Therefore, it is necessary to propose a simple and economical countermeasures to reduce a house damage caused by liquefaction. Problems to be solved are summarized as:
How to predict tilting and settlement of detached house due to ground liquefaction?
How to carry out effective countermeasures at narrow ground close to neighboring detached houses?
In this study, a simple numerical method has been proposed to predict tilting and settlement of detached house due to ground liquefaction. SPH (Smoothed Particle Hydrodynamics) scheme was used for this object. In order to confirm the validity of the proposed numerical tool, a numerical simulation for the model shaking table test (Yokawa et al., 2016, 2017a). Low noise and low vibration construction machine was then manufactured to satisfy the performance requirements on construction at residential land in the urban area. The MOYAI drain pipe was used as a drainage pipe for the proposed countermeasure. The MOYAI drain pipe is made of polypropylene which has the best chemical resistance even among the high polymer materials and is a pliable and mutually bonded three-dimensional net-shaped body of water permeable material.
