以大型岩土工程数值分析软件(ADINA)为研究手段,基于卸荷岩体力学的理论和方法,对某电站深孔泄洪洞进口边坡进行了开挖卸荷分析。基于此,重点分析不同加固角度对边坡的加固效果,同时也分析了不同锚固力作用下边坡的加固效果,结果表明加固角度为俯角20°时效果最优;锚固力越大,边坡变形越小。考虑到成本控制,采用2 000 kN的预应力锚索。再者,开挖边坡直立坡段处修建有弧形闸门用于泄水,故着重分析此处的加固方案,以保证闸门的正常运行,结果显示锚固力对加固效果有直接影响。研究成果对设计采用锚索加固的高陡边坡工程具有一定的借鉴作用。
Abstract
The excavation and unloading deformation stability of the deep discharge tunnel inlet at a hydropower station were analyzed to optimize the anchorage angle using software ADINA in association with the actual geological conditions and the actual needs of deformation control. Moreover, the reinforcement effect of the slope under different anchorage forces and angles was analyzed. Results show that the reinforcement effect is the best when anchorage angle of depression is 20°, and anchoring force is inversely proportional to the slope deformation. In this paper, prestressed anchor of 2 000 kN was used to control the cost. Besides, radial gate is adopted at the vertical segment of the excavated slope of deep discharge tunnel, so the deformation at this position needs to be stringently controlled to guarantee the gate’s normal operation. Anchorage force has direct influence on the reinforcement effect. The research results offer reference for the anchorage design of high and steep slopes.
关键词
边坡 /
锚固角度 /
锚固力 /
预应力锚索 /
稳定性
Key words
slope /
anchorage angle /
anchorage force /
prestressed cables /
stability
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基金
国家自然科学基金重点项目(51439003);水利部公益基金项目(201401029);湖北省高等学校青年教师深入企业行动计划项目(XD2014035);三峡大学研究生科研创新基金项目(2014CX002)
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