sir please solve my assignment problem. it is a 10 marks question so please give

Question

sir please solve my assignment problem.
it is a 10 marks question so please give detailed answer of all the parts & explain it briefly.

B.4 A mountainous area considered to be geologically stable is frequented by Landslides. In the light of the information that the area represent a stable mass, you may attempt analyzing the cause of landslides and suggest remedial measures. (10 marks) Your answer should include the following: B.4.1 The meaning of the term 'Geologically a stable land mass' B.4.2 Possible factors that may be responsible for landslides in the area 8.4.3 Remedial measures

Explanation / Answer

Ans (1) For answer of this question best will be like , if we try to find out that which country is the most stable geologically then the answer is Antarctica. This is because Antarctica (only the landmass) is away from any geological plate boundary. Also it is isolated from rest of the continents and seas by circum-polar counter current. So climatically it remains same all through the year. But this is relative data.

Ans (2)  Major factors affecting landslides

Factors causing landslides to occur fall into two categories: 1) things increasing driving forces, and 2) things reducing resisting forces.

Factors increasing driving forces:

1. Steepening the slope

2. Adding weight to (loading) the slope, especially the upper parts

3. Increasing the height of a slope (either by human or natural downcutting)

3. Seismic shaking

Factor reducing resisting forces:

1. Adding water to the slope --> causes increased pore pressure --> reduces frictional strength

2. Steepening the slope --> reduces normal stress, and thus reduces internal friction

3. Bedding, jointing, or foliation parallel to slope or dipping out of slope --> these discontinuities are low-strength zones along which the rock can fail and slide out of the slope

4. Intrinsically weak materials (e.g., deeply weathered, sheared, unconsolidated, or clay-rich materials)

5. Undercutting the slope --> reduces support

6. Removing vegetation, especially trees --> loss of root strength, also increased water in soil due to reduced evaporation losses

7. Seismic shaking

Most of the factors causing landslides are similar to slope failure, however the two most significant factors that are most critical for landslides are the rainfall and seismicity. The following discussion explains their mechanism in the context of landslides

Ans(3)- Modification of slope geometry

Drainage

Retaining structures

Internal slope reinforcement

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