Stability Study On Cataclastic Rock High Slope Of Reservoir Banks Highway

Based on the practical experience of plentiful highway construction projects in western mountainous areas, abundant concrete data of the rocky high slope in Qinling and Bashan Areas and the expressway between An’kang and Shaanxi-sichuan boundary, the cataclasite rock high slope of reservoir banks highway is studied by plenty of geological surveys, tests, theoretical computation, numerical simulation, field monitoring. The main findings are as follows:1、SEM test on the rock sample of Woshiliang slope.The SEM test shows that the microstructure of the rock is a pore-fracture structure full of a large number of pore rock particles and fissure system. The structure of the shale sample is very uniform and its monolithic structure is relatively dense. But the clastic rock structure of soft interlayer is loose and cataclastic seriously.2、MTS test on the rock sample of Woshiliang slope.12uniaxial tests and15triaxial tests are done to shale and soft interlayer sandstone of clastic rocks respectively under the conditions of dry and saturated. The results shows the two are all belong to water sensitivity rock, so the compressive strength of the rocks is greatly influenced by water, and the stress-strain linear correlation of the rocks is very poor.3、Derive the ultimate failure angle under seepage pressure effect of rock slope.Based on the engineering geological condition, when the sliding surface of slope body is in a saturated state, simplified sliding model under seepage pressure effect of rock slope is established, considering water seepage pressure of the sliding surface. The ultimate failure angle under seepage pressure effect of rock slope is derived, and the relationship among slope height, angle and ultimate failure angle are also gained.4、Fuzzy judgment matrix model is established, and the stability of Woshiliang slope is analyzed by the above model and analytic hierarchy process. Cusp catastrophe theory model is established and the stability of Woshiling slope is calculated, considering about the water seepage pressure effect of sliding surface and the influence of edge fracture water pressure on slip mass stability after slope cracking. Based on more-coulomb strengthen theory, the stability of Woshiliang slope is analyzed by rigid limit equilibrium method. Finally, the consistent result by three methods shows that the slope is unstable after excavating. The comparison of the three methods indicates that cusp catastrophe theory has obvious practicability in calculating the stability of rock slope with complex factors.5、The stability of Woshiliang slope under different protection states is analyzed by FLAC. The result shows that the slope is unstable with no protection; the safety factor of slope is slightly increased with anchor bolt frame beams, but the sliding surface of soft interlayer may shear and slide out; the slope is in the state of creep deformation with anti-slide pile, and it is stable. Slope is overall stable after being imposed anti-slide pile reinforcement measures, but in the state of peristalsis deformation, may have local instability.6、Woshiliang slope is monitored by the following two ways:Slope surface displacement monitoring with GPS and slope deep displacement monitoring with reinforcement meter. According to the analysis on the monitoring data, together with calculation and simulated results, the stability of Woshiliang slope is evaluated and predicted.