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党于航,苏生瑞.资兴高速K21段顺层岩质边坡支护过程数值模拟研究[J].河北工程大学自然版,2019,36(1):6-10
资兴高速K21段顺层岩质边坡支护过程数值模拟研究
Numerical Simulation of Supporting Process of Zixing highway K21 Slope Bedding Rock Slope
投稿时间:2018-09-21  
DOI:10.3969/j.issn.1673-9469.2019.01.002
中文关键词:  顺层岩质边坡  软弱层面  数值模拟  锚索
英文关键词:bedding rock slope  weak bedding surface  numerical simulation  anchor
基金项目:国家自然科学基金资助项目(41877247),国家自然科学基金资助项目(41502278)
作者单位
党于航 长安大学 地质工程与测绘学院, 陕西 西安 710054 
苏生瑞 长安大学 地质工程与测绘学院, 陕西 西安 710054 
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全文下载次数: 103
中文摘要:
      以资兴高速K21段顺层岩质边坡为研究对象,借助现场调查、数值模拟研究段边坡的开挖和支护过程,对各阶段的稳定性、位移、应力等的变化规律进行分析,验证了开挖、支护设计的合理性以及边坡加固的安全性,研究了边坡在开挖支护过程中应力应变规律。结果表明,顺层岩质边坡开挖扰动开挖破坏了边坡原有的应力分布,导致岩体产生裂隙损伤和变形,并逐渐扩张,弱化岩体和层面自身的强度。同时,边坡开挖,直接破坏了边坡原有的连续受力体系,由于软弱层面的抗剪强度较低,从而导致岩层沿开挖揭露的软弱层面整体下滑。锚索框架一方面通过对坡体的位移的控制作用,增加坡体的稳定性,另一方面通过预应力锚索把层状岩体锚固在一起,使得各层之间摩阻力增大,内应力和挠度大为减少,大大提高了层面的抗剪强度。
英文摘要:
      Taking the high-grade K21 segmental rock slope in Zixing Expressway as the research object, a numerical model is built on the typical slope in the study area to simulate the excavation and supporting process of the slope by using on-site investigations, numerical simulation methods. Its stability, displacement, stress and strain features under different excavation and supporting are analyzed and summarized. The rationality of the excavation and support design and the safety of the slope reinforcement are verified. The stress-strain laws of the slope in the excavation and support process are analyzed. The results show that the main manifestation of disturbance in excavation of bedding rock slope is that the excavation destroys the original stress distribution of the slope, causes cracks and deformations in the rock mass and gradually expands, and weakens the strength of the rock and its stratum. Simultaneously, the open-cut cutting of the rock slope produces a free surface and directly destroys the original continuous force system of the slope. Due to the low shear strength of the weak layer, the overall rock formations slide along the weak structural surface which exposed by slope excavation. On one hand, the anchor cable frame increases the stability of the slope by controlling the displacement of the slope body. On the other hand, the layered rock mass is anchored together by the prestressed anchor cable, so that the frictional resistance between the layers increases. The stress and deflection are greatly reduced, which improves the shear strength of the layer greatly.
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