《基础工程》课程PPT教学课件（英文讲稿）Chapter 08 Mechanically Stabilized Earth and Concrete Retaining Walls

Chapter 8 Mechanically Stabilized Earth and Concrete Retaining Walls

Chapter 8 Mechanically Stabilized Earth and Concrete Retaining Walls

8.1 Introduction Retaining walls are used to prevent retained material from assuming its natural slope. Retaining walls may be classified according to how they produce stability: DMechanically reinforced earth-gravity wall ②Gravity ÷③Cantilever ④Anchored

8.1 Introduction ❖ Retaining walls are used to prevent retained material from assuming its natural slope. ❖ Retaining walls may be classified according to how they produce stability: ❖ ①Mechanically reinforced earth-gravity wall ❖ ②Gravity ❖ ③Cantilever ❖ ④Anchored

墙顶 1:m 墙面 回填土 泄水孔 反滤层 地面 墙背 图1重力式挡 ZM119K29 土墙的基本组成 夯填粘土层 排水沟 墙趾墙底 境踵

图C14钢结构式挡土墙的示意图图和照片（图摘自参考文献11）

8.2 Mechanically Reinforced Earth Walls The mechanically reinforced earth wall uses the principle of placing reinforcing into the backfill using devices such as metal strips and rods,geotextile strips and sheets and grids,or wire grids. Three basic components: ”( 1The earth fill-usually select granular material 2Reinforcement-fastened to the facing unit and extending into the backfill some distance 3Facing unit-not necessary but usually used to maintain appearance and to avoid soil erosion between the reinforcement

8.2 Mechanically Reinforced Earth Walls ❖ The mechanically reinforced earth wall uses the principle of placing reinforcing into the backfill using devices such as metal strips and rods, geotextile strips and sheets and grids, or wire grids. ❖ Three basic components: ❖ ①The earth fill-usually select granular material ❖ ②Reinforcement-fastened to the facing unit and extending into the backfill some distance ❖ ③Facing unit-not necessary but usually used to maintain appearance and to avoid soil erosion between the reinforcement

8.2 Mechanically Reinforced Earth Walls The facing units may be curved or flat metal plates or precast concrete strips or plates.Where geotextiles are used the sheet may lap to produce the facing unit. Grid-type reinforcements strengthen the soil through a combination of friction and passive pressure pullout resistance. The bent-up portion used as a facing pieces provides some erosion control until the wall is completed.-Fig.8.3

8.2 Mechanically Reinforced Earth Walls ❖ The facing units may be curved or flat metal plates or precast concrete strips or plates. Where geotextiles are used the sheet may lap to produce the facing unit. ❖ Grid-type reinforcements strengthen the soil through a combination of friction and passive pressure pullout resistance. ❖ The bent-up portion used as a facing pieces provides some erosion control until the wall is completed.-Fig. 8.3