Method of reinforcing slope reverse analysis technique

A method for reinforcing a slope using a reverse analysis technique comprising the steps:

• a) determining underground water level conditions, slope configuration, soil condition status and rock joint orientation in connection with an applicable limit of the slope;
• b) applying the information from step (a) to determine soil parameters including cohesion and an internal friction angle using the Janbu method based on characteristics of the deformed ground;
• c) analyzing stability of the slope using the soil parameters determined by the Janbu method to estimate a driving force and a resistance force of the slope;
• d) defining a reinforcement zone to be constructed with reinforcement members to increase the resistance force of the slope;
• e) determining, the position and number of subterranean horizontal drain holes based on the underground water level conditions to thereby provide external stability;
• f) comparing internal stability in the reinforcement zone to a critical failure section based on a pull-out force and shear capacity of the reinforcement member;
• g) preparing design drawings that conform to the external and internal stabilities;
• h) and carrying out reinforcement construction work, wherein the step of carrying out the reinforcement construction work comprises the steps of:
• i) insert-laying the reinforcement members in the slope in accordance with the design drawings;
• ii) mixing cement, water and high fluidizing agent to produce grout and gravitationally injecting the grout around the reinforcement members;
• iii) laying slope drain holes in the slope in such a manner that they extend beyond the reinforcement zone in accordance with the design drawings;
• iv) installing main earth-pressing steel plates, PVC-coated wire mesh and sub-earth pressing steel plates to fix the reinforcement members;
• and
• v) applying to surfaces of the slope by a spray vegetation method an artificial soil covering material selected from the group consisting of general artificial soil mixed with natural monofilaments.