(4) According to the depth and scope of the landslide, the location, the stress condition and the degree of damage, the treatment measures should be taken in time
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(6) When using rubble slope protection, skeleton slope protection and other protective measures, drainage measures should be taken to facilitate the rapid drainage of slope water and prevent water from permeating into the soil and causing damage
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Therefore, in the process of excavation and protection of expansive soil slope, drainage ditch should be set for surface water to intercept and discharge the flow on the slope, so as to reduce the infiltration of surface water into the soil and erosion of the slope
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The cutting excavation spoil should not be piled up at the top of the cutting slope
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We have adopted various forms of protection and treatment for the expansive soil slope in the construction of Changjing railway, so as to accumulate data and provide reference for the future expansive soil slope protection and treatment
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(1) The cutting slope shall be excavated step by step from top to bottom in strict accordance with the design slope, and bottom panning excavation is strictly prohibited
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(2) Set up drainage system
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The construction principle of expansive soil slope must be attached great importance during the construction, otherwise it is easy to have problems
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(3) Stack the spoil reasonably
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In case of strong expansive soil with soft soil, developed structural plane and easy to be weathered, the construction shall be carried out quickly, and the protection and treatment shall be carried out immediately after the excavation of cutting slope
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The principles are carefully considered and discussed together, which is the most suitable
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Water is an important factor for expansive soil to produce expansion and contraction deformation and reduce the strength
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Generally, it should be 2-5M away from the excavation line, because the pile up at the top of the cutting will increase the load and lateral stress of the slope, resulting in excessive tensile stress and cracking at the top of the cutting, which will make the rainwater infiltrate into the cutting slope along the cracks and reduce the strength of the soil
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The railway expansive soil slope protection should be selected according to the scale and grade of the project and the stress distribution characteristics of different parts of the slope
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(5) If the soil mass of cutting slope has entered the stage of increasing deformation, but no overall sliding occurs, measures such as reducing load, slowing down slope and adopting retaining structures should be taken in time to prevent landslide
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