缓倾顺层岩质边坡变形破坏及处治技术研究

在查明边坡结构特征以及地层岩性特征的前提下,对宜巴高速公路第四合同段黄花互通D匝道的工程地质条件进行分析,并对软弱结构面进行研究,在此基础上运用FLAC软件对边坡变形破坏进行数值模拟,对边坡变形破坏机理进行深入探讨。研究结果表明:顺层岩质边坡中软弱结构面对边坡稳定性起到主控作用,存在夹层物质的黏性土具有遇水膨胀性质,对边坡失稳有推动作用。上覆岩体沿着软弱结构面发生滑动,前缘率先发生滑动,拉动后缘岩体发生滑动,破坏模式属于顺层滑移拉裂型破坏。通过预应力锚杆对边坡进行加固后,边坡稳定性得到改善,可保持其稳定状态。

Study on Deformation Destruction of Gently Inclined Bedding Rock Slope and the Treatment Technology

This paper, on the premise of finding out the characteristics of slope structure and formation lithology, analyzed the engineering geological condition at the Ramp D, Huanghua Interchange, the 4th Contractual Section of Yiba Highway, then studied the soft structural plane thereof, and made numerical simulation on slope deformation destruction by FLAC software so as to discuss the destruction mechanism profoundly. The results show that the soft structural plane in bedding rock slope plays the role of major control on slope stability, the substance intercalated in the clay has the attribute of hydrophilic expansion and plays the role of catalyzer on slope failure. When the overlying rock slides along the soft structural plane, the leading edge thereof may slide at first, driving the trailing edge to slide then, thus the destruction mode is bedding sliding-tension type. The slope has improved stability after reinforced by prestressed bolt, and may keep its stable state.