Abstract:

The variation principle of deformation and stress triggered by excavation of slope often provide the scientific basis for safety monitoring of slope. Model experiment is an important way of displaying evolution of displacement and stress of high-cutting slope along highway. Taking K88+725 High-cuting Slope that locates in second-grade highway from Chongqing Wushan County to Wuxi County as the prototype, this paper approaches evolution of displacement and stress of slope excavation from similarity model experiment, and obtains Similarity material proportion is that borax: water: sand: cement: plaster is 0.01:1:7.705:0.384:0.900. Using physical model of 1:30 geometry, is divided the excavation of the model into 3 stages according to the actual construction process. The results indicate that the displacement peak is rising suddenly and it will remains steady after 4 days; but stress displays weakening fluctuatly; it will sustain weakening after 10 days. Based on difference of evolution of displacement and stress and continue of stress of slope excavation, the proposal that 3D stresses is principal monitoring and displacement monitoring is minor, is put forward.

Key words: road engineering, rock bedding slope, excavation, evolution of displacement and stress, model experiment