JPH07119150A - Reinforced embankment method - Google Patents

Abstract

PURPOSE:To prevent the collapse of an embankment due to earthquakes or rain water, by laying down reinforcing materials on the whole area of the embankment and rolling aggregates thereon to form a unified impermeable bed. CONSTITUTION:A reinforcing material 2 is spread all over the area to fill an embankment 1 and aggregates having particle sizes permeating water 6 are rolled on the reinforced material 2 to form a unified permeable bed 3 with the reinforcing material 2. Such one or more permeable beds 3 are laid and an embankment 1 is piled thereon. In this way, various kinds of collases of the embankment resulting from the difference of displacements of a soft ground 4 and a hard ground 5 on earthquaking, generation of the excess pore water pressure, and retained rain water at the bottom of embankment in the rainy time, can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an embankment constructed straddling soft ground and hard ground, which causes collapse and excessive pore water pressure due to a displacement difference between the soft ground and hard ground when an earthquake occurs. The present invention relates to a reinforced embankment method for preventing both collapse due to damage and collapse due to infiltration water stored in the ground at the bottom of the embankment when there is a large amount of rainfall.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing collapse of an embankment constructed on soft ground due to an earthquake disaster,
There is a method of laying a reinforcing material on the bottom of the embankment. In addition, as a method of preventing collapse of the embankment constructed on hard ground due to rainfall damage, there is a method of providing a permeable layer at the bottom of the embankment. However, the embankment constructed across the soft ground and the hard ground will collapse due to the earthquake disaster and the rainfall and flood damage. However, since the mechanism has not been fully clarified, it was unclear how to apply these construction methods. Therefore, for the embankment constructed across the soft ground and the hard ground, the reinforced embankment method using geotextal was used.

FIG. 2 is an explanatory view of a conventional reinforced embankment method without using the present invention. Here, 1 is embankment, 2 is reinforcement, 4 is soft ground, 5 is hard ground, 6 is seepage water, 7
Is a spring location. The conventional reinforced embankment method is a method of laying the reinforcing material 2 of a certain length on the slope of the embankment 1, and only the laid portion of the reinforcing material 2 is reinforced. For this reason, in the embankment 1 constructed across the soft ground 4 and the hard ground 5, the soft ground 4 vibrates more than the hard ground 5 and a displacement difference occurs when an earthquake occurs, so that the tensile force is applied to the bottom of the embankment. The embankment 1 had collapsed due to the action and excessive pore water pressure. Further, when the rainfall was large, the amount of infiltrated water 6 in the hard ground became large, and the infiltrated water 6 that had springed out from the spring location 7 was stored at the bottom of the embankment, causing the embankment 1 to collapse.

[0004]

Problems to be Solved by the Invention In an embankment constructed across a soft ground and a hard ground, collapse occurs due to an earthquake disaster and rainfall flood damage, so it is necessary to deal with earthquake disasters and collapse caused by rainfall flood damage. There is. According to the conventional technology, when an earthquake occurs, tensile force acts on the bottom of the embankment or excessive pore water pressure is generated to cause collapse, and when there is a large amount of rainfall, the infiltrated water that has sprung from the spring location is the embankment. There was a problem that it was stored at the bottom and collapsed. The present invention provides a reinforced embankment method for preventing collapse caused by earthquake disaster and rainfall and flood damage, in a embankment constructed across soft ground and hard ground, which is a method for solving the above problems. The purpose is to do.

[0005]

According to the present invention, when embankment is constructed straddling soft ground and hard ground, a reinforcing material is laid on the whole area where the embankment is constructed, and permeated water permeates through the reinforcing material. Aggregate with a particle size that can be squeezed to form a permeable layer that is integrated with the reinforcing material. After providing one or two or more permeable layers, embankment is built on the permeable layer to construct the embankment body. It is a construction method.

[0006]

[Operation] By laying the reinforcing material on the entire area where the embankment is constructed, the collapse of the embankment can be prevented even if the tensile force acts on the bottom of the embankment when an earthquake occurs. By forming the permeable layer integrated with the reinforcing material, it is possible to prevent collapse of the embankment even if excessive pore water pressure is generated at the time of an earthquake or if the infiltrated water that springs up during heavy rainfall is stored at the bottom of the embankment.

[0007]

EXAMPLE FIG. 1 is an explanatory view of an example of the reinforced embankment method of the present invention. Where 1 is the embankment, 2 is the reinforcement, 3
Is permeable layer, 4 is soft ground, 5 is hard ground, 6 is seepage water,
7 is a spring location. When constructing an embankment straddling soft ground and hard ground, a reinforcing material is first laid on the entire area where the embankment is constructed. Next, an aggregate having a particle size capable of allowing permeated water to pass therethrough is compacted on the reinforcing material to form a water-permeable layer integrated with the reinforcing material. In this method, one or two or more water-permeable layers are provided, and then embankment is constructed on the water-permeable layer to construct an embankment. Collapse due to displacement difference between soft ground and hard ground during earthquake and collapse due to excessive pore water pressure, and collapse due to storage of infiltrated water in the ground at the bottom of the embankment during heavy rainfall Both can be prevented.

[0008]

As described above, according to the reinforced embankment method of the present invention, even when the embankment is constructed over the soft ground and the hard ground, the displacement difference between the soft ground and the hard ground when an earthquake occurs It is possible to prevent both collapse due to occurrence and collapse due to excessive pore water pressure, and collapse due to the fact that permeated water in the ground is stored at the bottom of the embankment during heavy rainfall.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a reinforced embankment method of the present invention.

FIG. 2 is an explanatory view of a reinforced embankment method according to a conventional technique that does not use the present invention.

[Explanation of symbols]

 1 Embankment 2 Reinforcement material 3 Permeable layer 4 Soft ground 5 Hard ground 6 Infiltration water 7 Spring location

Claims (1)

[Claims] 1. An embankment constructed across soft ground and hard ground, causing collapse due to a displacement difference between the soft ground and hard ground during an earthquake, and collapse due to excessive pore water pressure. It is a reinforced embankment method that prevents both the collapse of the infiltrated water inside the ground at the bottom of the embankment when there is a large amount of rainfall. The aggregate having a particle size capable of allowing permeated water to pass therethrough is compacted to form a water-permeable layer integrated with the reinforcing material, and one or more water-permeable layers are provided on the water-permeable layer. Reinforced embankment method for embankment to build a bank.