| The stability analysis of rock slope is a very important topic. The field covershighway, housing construction, railway, tunnel etc. In the practical engineering, thestability of the slope rock mass is mainly controlled by rock mass structure, so thestructural plane anti-shear parameters determination accurately and reasonably is thekey to the analysis of rock mass slope stability This article based on the Ministry ofTransport west traffic construction science and technology project：“Slippy strataroadbed safety evaluation、 prediction and forecast and prevention and controltechnology research in Chongqing three gorges region”， we determine its typicalstructural plane by a huge of data investigation in Chongqing area, and through theactual project we get sample and do directly indoors structural surface shear test,particle flow code in2dimensions discrete element numerical simulation, having aresearch on the internal friction angle and cohesion c of structural surface shearparameters, the following main conclusions are brained:⑴The stability of slope rock mass is controlled by rock mass structural plane.Through large amount of data collection and research, we found that in Chongqingthree gorges region sandstone structural plane and the sandstone and mudstoneinteraction structural plane is the main plane that control the stability of slope, morethan half of the bedding slope is controlled by this structure plane. These two kinds ofstructural plane in Chongqing region play a controlling role in the stability of the slope,they are typical structure plane.⑵By indoor portable shear test，we get the anti-shear strength parameters of typicalrock mass structural plane in Chongqing area. For sandstone structural plane，theinternal friction angle between32.08~32.43degrees，cohesion within103kpa to114kpa；for the sandstone and mudstone interaction structural plane，the internal frictionangle between25.52~25.73degrees，cohesion within72kpa to85.1kpa.⑶By indoor direct shear test，we get the anti-shear strength parameters of typicalrock mass structural plane in Chongqing area. For sandstone structural plane，theinternal friction angle is31.37degree，cohesion is94kpa；for the sandstone andmudstone interaction structural plane，the internal friction angle is24.62degree，cohesion is65kpa. ⑷By PFC2D procedure，we simulate the shear test of sandstone structural planeand the sandstone and mudstone interaction structural plane in Chongqing area. Forsandstone structural plane，the internal friction angle is34.31degree，cohesion is134kpa；for the sandstone and mudstone interaction structural plane，the internal frictionangle is28.68degree，cohesion is103kpa.⑸To verify the correctness of the test results, after we get indoor test andsimulation test results, we have a comparison with previous results. Then, we concludethat the anti-shear strength parameters of the typical structure plane in Chongqing area:for sandstone structural plane，the internal friction angle between31.37~34.31degrees，cohesion within94kpa to134kpa；for the sandstone and mudstoneinteraction structural plane，the internal friction angle between24.62~28.68degrees，cohesion within65kpa to103kpa. |
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