IT IS NECESSARY TO MAINTAIN SHEAR STRENGTH OF A GRADED COHESIONLESS SOIL REQUIRED FOR THE SOIL STABILITY OF EARTH ROADS AND PROTECT THE HILL SLOPES TO AVOID THE LAND SLIDES

It has been observed during the recent heavy rains that there is an important role of the three main constituents of soil --- sand, silt and clay, rarely occur in nature in a pure or stabilized form but have limitless combinations of proportions by stabilized soil, is meant that the different constituents of soil are mixed in such a proportion that the properties of the resultant soil produced are more resistant to weathering after affects and the load carrying capacity is considerably increased and the soil is maintained in a high state of stability. Most soils, to be stable require the addition either of fine or of course material, so that the proportions of particles of different sizes fall within certain limits, required for the description made in this behalf of the earth roads . A large number of soils when well compacted and at a suitable moisture content have good load bearing properties but become unstable if their moisture content is increased. As such it is necessary to achieve ideal mechanical stability and to have a well proportioned coarse  material (having a particle size distribution giving a high dry density) together with some fine binding material such as moorum, clay as such shear strength of a graded cohesionless soil is greater than that of a soil where the particles are of a uniform size and numerous methods have been prescribed to adopt the determining proportions required for the stability of the soils. It is particularly mentioned here that the old Swarghat Bilaspur road has been given an alternative of the four lane road by tunneling and also by cutting of the new alignment to improve the situation and position of the present road net work to Chandigarh Manali via Bagher but the soil of said area and jurisdiction covered by the National Highway Authority of India, require more stability in the provision made where it is necessary to protect the existing cutting profiles of the area covered by the present alignment of the road net work and have appropriate standard of the breast walls and the hill slopes coming down because of the ill soil stability at particular places of the high level terrains maintained by the National highway authority of India without any protection work, even classification of soil is unstable and demanding protection of the hill profiles:-- Er Fateh Chand Guleria, Director RTI Welfare Association, Registered number HPCD, 3552 , Bilaspur Himachal pradesh phone number, 9459334377