Recently, the fast economic growth and concentration of population in cities has led to an increase in the construction of high-rise buildings and condensation at the city centers, and consequently, it has become unavoidable to construct the buildings close to the existing structures and use the bas...
Recently, the fast economic growth and concentration of population in cities has led to an increase in the construction of high-rise buildings and condensation at the city centers, and consequently, it has become unavoidable to construct the buildings close to the existing structures and use the basement space. The most typical example is the drilling works to create the basement space for the parking lot of large building and the construction of the subway stations and rails. As the construction has become large scale and the drilling depth has increased significantly, studies on the design of the retaining wall structure have increased in order to ensure safe construction works.
In addition, excessive deformation behavior in the retaining wall and the surrounding soil ground in the city center, where the population and high-rise buildings are concentrated, may cause the fracture in the neighboring buildings, destruction of the structures buried underground, and the collapse of the retaining wall during the construction works, thereby causing tremendous damage to property and serious injuries of human. Therefore, it has become unavoidable to map out comprehensive plans in order to ensure stability and cost-effectiveness of the soil walls and adjacent structures.
Thus, In this essay, a model soil box test about the surface of earth retaining wall was conducted to analyze ground surface settlement that influence displacement occurring from the wall and adjacent structures. Sandy soil was selected for the experiment and the conditions were divided into wall penetration depth, length of the superior angle, and strut status. Then, a 5-step excavation was constructed to analyze wall displacement and ground surface settlement about each condition to research the movements on the edge of the superior angle during excavation.
The experiment could have yielded more realistic results if a model and construction materials of the actual model were used. However, since an infinitely large construction was not possible, a soil box within the limits of the interior space had to be designed, constructed and implemented. To accomplish this, model and construction materials of the actual soil were reduced according to proportion then the experiment was carried out. Experiment tools used in this research can be classified into soil box, earth retaining wall, strut, and a measuring instrument.
From the experiment, as the length of the superior angle increased, soil wedge that act on the retaining wall increased as well. As a result, due to the increase in wall displacement and ground surface settlement of the bottom part of the soil, earth retaining superior angle was judged to be a section of greater modification compared to the lineal section. As the penetration width lengthened, the ground surface settlement of the superior angle edge was shown to be suppressed; therefore, it was decided that increasing the penetration width higher than the estimate would be advantageous for securing safety. One additional strut layer was installed to analyze the movements on the edge of the superior angle. The results showed a reduction effect on maximum ground surface settlement and maximum horizontal displacement. Accordingly, when designing the model, a measure to increase the penetration width on the edge of the superior angle as well as installing an additional strut are effective in securing safety.
Recently, the fast economic growth and concentration of population in cities has led to an increase in the construction of high-rise buildings and condensation at the city centers, and consequently, it has become unavoidable to construct the buildings close to the existing structures and use the basement space. The most typical example is the drilling works to create the basement space for the parking lot of large building and the construction of the subway stations and rails. As the construction has become large scale and the drilling depth has increased significantly, studies on the design of the retaining wall structure have increased in order to ensure safe construction works.
In addition, excessive deformation behavior in the retaining wall and the surrounding soil ground in the city center, where the population and high-rise buildings are concentrated, may cause the fracture in the neighboring buildings, destruction of the structures buried underground, and the collapse of the retaining wall during the construction works, thereby causing tremendous damage to property and serious injuries of human. Therefore, it has become unavoidable to map out comprehensive plans in order to ensure stability and cost-effectiveness of the soil walls and adjacent structures.
Thus, In this essay, a model soil box test about the surface of earth retaining wall was conducted to analyze ground surface settlement that influence displacement occurring from the wall and adjacent structures. Sandy soil was selected for the experiment and the conditions were divided into wall penetration depth, length of the superior angle, and strut status. Then, a 5-step excavation was constructed to analyze wall displacement and ground surface settlement about each condition to research the movements on the edge of the superior angle during excavation.
The experiment could have yielded more realistic results if a model and construction materials of the actual model were used. However, since an infinitely large construction was not possible, a soil box within the limits of the interior space had to be designed, constructed and implemented. To accomplish this, model and construction materials of the actual soil were reduced according to proportion then the experiment was carried out. Experiment tools used in this research can be classified into soil box, earth retaining wall, strut, and a measuring instrument.
From the experiment, as the length of the superior angle increased, soil wedge that act on the retaining wall increased as well. As a result, due to the increase in wall displacement and ground surface settlement of the bottom part of the soil, earth retaining superior angle was judged to be a section of greater modification compared to the lineal section. As the penetration width lengthened, the ground surface settlement of the superior angle edge was shown to be suppressed; therefore, it was decided that increasing the penetration width higher than the estimate would be advantageous for securing safety. One additional strut layer was installed to analyze the movements on the edge of the superior angle. The results showed a reduction effect on maximum ground surface settlement and maximum horizontal displacement. Accordingly, when designing the model, a measure to increase the penetration width on the edge of the superior angle as well as installing an additional strut are effective in securing safety.
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