Rock slope is dangerous because the area of cutting does not have stable

Rock slope is dangerous because the area of cutting

This preview shows page 71 - 77 out of 320 pages.

Rock slope is dangerous because the area of cutting does not have stable binding ability. If the failure of stone happen, it will cause the accident and dangerous for us. There are some methods which had being used in our country to overcome the problems. i. Build the fencing along the slope areas. ii. Use a net. iii. Gabion block. b. Water Infiltration Water infiltration in soil also influences the soil stability. Storey and soil drainage system are important. Sub-soil drains are always used to control the flow of infiltration. 3.2.2 EMBANKMENT SLOPE
Image of page 71
THE TECHNIQE OF PLANNING AND PRE-CONSTRUCTION ROAD WORK Highway Engineering C3010 / UNIT 3 Slope embankment takes place when the original soil is under the level of new road formation to be built. Embankment slope is built by equivalent or different types of materials depend on soil strata. Figure 3.3: Embankment by equivalent materials Figure 3.4: Embankment by different materials Tables 3.2: of safety sloping degree in soil banking Types of material Height ( m ) Slope: Hor. To Ver. ( well graded sand ) 0 – 6 1:1.5 – 1:1.8 i. Normally Cut Slope 1:1.5 1:1.8 1:2.0 ii. Step Slope 1.5 – 2.0m Compact earth Sand Rock 1:0.5 1:1.0 1:2.0
Image of page 72
THE TECHNIQE OF PLANNING AND PRE-CONSTRUCTION ROAD WORK Highway Engineering C3010 / UNIT 3 6 – 15 1:1.8 – 1:2.0 ( poorly graded sand ) 0 – 10 1:1.8 – 1:2.0 Rock 0 – 10 10 – 20 1:1.5 – 1:2.0 1:1.8 – 1:2.0 Clay 0 - 6 1:1.8 – 1:2.0 3.2.2.1 Problems in slope banking There are several problems that are related to the embankment slope. Landslide There are some ways to overcome the problem . i. Turfing - Planting the plants for slope protection ii. Prepare the slope with suitable slanting degrees. iii. Use Geofabric and geotextiles to avoid the diffusion of ground water. Erosion Soil erosion happens because of infiltration and the flow of water run-off. To prevent the erosion, a few methods can be used: i. Prepare the drainage system to let the water flow easily. ii. Grow plants to cover the slope surface. ACTIVITY 3B
Image of page 73
THE TECHNIQE OF PLANNING AND PRE-CONSTRUCTION ROAD WORK Highway Engineering C3010 / UNIT 3 Let’s test your understanding before we continue to the next input…. GOOD LUCK…. 3.4 There are two types of side slope in Highway Engineering. Name the types by filling in place below. 3.5 Match the two type slope as the answer from question 3.4 with its description. Write the words in the boxes provided. 3.6 Name the problems of the fffembankment slope by filling the chart below. Its take place when the original soil is under the level of new road formation to be built. Its takes place when the original soil level higher then the level of new road formation to be built. Two types of slopes? …………………… ……………………
Image of page 74
THE TECHNIQE OF PLANNING AND PRE-CONSTRUCTION ROAD WORK Highway Engineering C3010 / UNIT 3 Embankment Slope FEEDBACK TO ACTIVITY 3B
Image of page 75
THE TECHNIQE OF PLANNING AND PRE-CONSTRUCTION ROAD WORK Highway Engineering C3010 / UNIT 3 3.4 3.5 3.6 The answers are….. Cut Slope Embankment Slope
Image of page 76
Image of page 77

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture