预应力锚索支护在岩质高边坡工程中的应用及稳定性的有限元分析
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摘要
预应力锚固技术在近代岩土工程中得到了广泛的应用,取得了巨大的成功,应用的理论研究也获得了很多的成果,但目前国内对预应力锚索支护的研究尚不足。预应力锚索支护设计还主要依靠工程经验和工程类比法,同时结合规范及相关的岩土类软件进行分析而得,理论研究的落后制约了预应力锚索支护技术的进一步发展,因而对预应力锚索支护做进一步研究具有一定的现实意义。
针对目前预应力锚固技术中存在的一些问题,本论文结合长春市玫瑰谷采石场岩质高边坡支护工程,详细的说明了预应力锚索支护结构的参数设计计算。同时采用GeoStudio、ANSYS10.0软件,应用有限元强度折减法对边坡进行稳定性分析,通过数值分析得出结构荷载作用下边坡的位移、变形和塑性区域发展趋势,通过绘制不同强度折减系数下的边坡某一位置位移曲线来定边坡的安全系数。根据分析结果提出自己的观点,为今后同地质条件下预应力锚索支护设计和边坡的稳定性分析提供参考。
With the rapid development of our national economy, the flourish of modern construction, various large-scale engineering projects have been under construction such as high-rise buildings, water resources and hydropower facilities, mines, ports, highways, railways and energy projects, etc. However, abundant slopes have been inevitably formed during the construction of those projects or during the operation after construction. As a result, analysis of slope stability has become important research content in rock mechanics. However, there are a lot of problems arising in project practices, such as misunderstanding of characteristics and attributes of slope projects, ineffective measures taken in regulation projects. Those problems always result in deformation and destruction of slope projects with serious damages and great loss, or in unnecessary waste due to over-conservative regulation schemes. Therefore, analysis of slope stability and careful selection of slope regulation schemes are of great importance to satisfy a double goal of safety and economy.
First of all, the paper summarizes the developing course and current research status of prestressed cable support, expounds the analysis methods and principles of prestressed cable support, and introduces in detail principles and methods of prestressed cable support structure design and concrete design contents on the basis of previous study of prestressed cable. Furthermore, it expounds matters requiring attention in design calculation and stability analysis and introduces in detail the application of finite element strength reduction method in slope stability analysis by current standard design method, stability checking calculation and finite element strength reduction method.
Then combine Changchun City Rose Valley quarry slope management projects, detailed description of the prestressed cable structure parameters of the design process, and selection of Drucker-Prager constitutive model, based on the finite element ANSYS10.0 procedures strength reduction, the natural slope and prestressed cable slope stability checking to determine reasonable prestressed cable programmed. In carrying out finite element analysis, the slope will be for the plane eight discrete node isoperimetric element, the establishment of calculation model using finite element strength reduction through before and after processing, calculation results from the slope of the displacement, and plastic deformation regional trends by drawing within a point of the slope displacement and reduction coefficient curve to determine the relationship between the natural slope and prestressed cable slope safety factor.
According to the stability of the simulation analysis, the following conclusions can be drawn:
(1)Based on strength reduction finite element method, the way to analyse the slope stability does not need to assume the position of failure plane. And the computational model satisfies the balanced equation of power and stress-strain relationship of rock mass body, can be used to simulate the natural process of excavation, which is traditional limit equilibrium method could not be achieved.
(2)Application strength reduction method to analyse the slope stability, can get horizontal displacements of rock mass body under the different reduction factor, and determine the assurance factor by analyzing.
(3) According to the normative experience, a reasonable and safe prestressed cable parameter is determined and it satisfies the standards requirements of stiterion.
(4)The assurance factor of the supported slope can be obtained by simulation that is beyond 1.70.the stability of rock mass body significantly increase, but the displacement reduce, that is , prestressed cable programme for Rose Valley quarry in Changchun City High Slope Support project is feasible and reasonable.
针对目前预应力锚固技术中存在的一些问题,本论文结合长春市玫瑰谷采石场岩质高边坡支护工程,详细的说明了预应力锚索支护结构的参数设计计算。同时采用GeoStudio、ANSYS10.0软件,应用有限元强度折减法对边坡进行稳定性分析,通过数值分析得出结构荷载作用下边坡的位移、变形和塑性区域发展趋势,通过绘制不同强度折减系数下的边坡某一位置位移曲线来定边坡的安全系数。根据分析结果提出自己的观点,为今后同地质条件下预应力锚索支护设计和边坡的稳定性分析提供参考。
With the rapid development of our national economy, the flourish of modern construction, various large-scale engineering projects have been under construction such as high-rise buildings, water resources and hydropower facilities, mines, ports, highways, railways and energy projects, etc. However, abundant slopes have been inevitably formed during the construction of those projects or during the operation after construction. As a result, analysis of slope stability has become important research content in rock mechanics. However, there are a lot of problems arising in project practices, such as misunderstanding of characteristics and attributes of slope projects, ineffective measures taken in regulation projects. Those problems always result in deformation and destruction of slope projects with serious damages and great loss, or in unnecessary waste due to over-conservative regulation schemes. Therefore, analysis of slope stability and careful selection of slope regulation schemes are of great importance to satisfy a double goal of safety and economy.
First of all, the paper summarizes the developing course and current research status of prestressed cable support, expounds the analysis methods and principles of prestressed cable support, and introduces in detail principles and methods of prestressed cable support structure design and concrete design contents on the basis of previous study of prestressed cable. Furthermore, it expounds matters requiring attention in design calculation and stability analysis and introduces in detail the application of finite element strength reduction method in slope stability analysis by current standard design method, stability checking calculation and finite element strength reduction method.
Then combine Changchun City Rose Valley quarry slope management projects, detailed description of the prestressed cable structure parameters of the design process, and selection of Drucker-Prager constitutive model, based on the finite element ANSYS10.0 procedures strength reduction, the natural slope and prestressed cable slope stability checking to determine reasonable prestressed cable programmed. In carrying out finite element analysis, the slope will be for the plane eight discrete node isoperimetric element, the establishment of calculation model using finite element strength reduction through before and after processing, calculation results from the slope of the displacement, and plastic deformation regional trends by drawing within a point of the slope displacement and reduction coefficient curve to determine the relationship between the natural slope and prestressed cable slope safety factor.
According to the stability of the simulation analysis, the following conclusions can be drawn:
(1)Based on strength reduction finite element method, the way to analyse the slope stability does not need to assume the position of failure plane. And the computational model satisfies the balanced equation of power and stress-strain relationship of rock mass body, can be used to simulate the natural process of excavation, which is traditional limit equilibrium method could not be achieved.
(2)Application strength reduction method to analyse the slope stability, can get horizontal displacements of rock mass body under the different reduction factor, and determine the assurance factor by analyzing.
(3) According to the normative experience, a reasonable and safe prestressed cable parameter is determined and it satisfies the standards requirements of stiterion.
(4)The assurance factor of the supported slope can be obtained by simulation that is beyond 1.70.the stability of rock mass body significantly increase, but the displacement reduce, that is , prestressed cable programme for Rose Valley quarry in Changchun City High Slope Support project is feasible and reasonable.
引文
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[10]张发明,刘宁,赵维炳等.岩质边坡预应力锚索加固的优化设计方法[J].岩土力学,2002,(2):187一190.
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[12]苏学贵.预应力锚索加固煤矿铜室合理性分析[J].煤矿设计,1997,6:34一37.
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[16]高大水.国内岩土预应力锚固技术应用及锚固技术参数统计[J].长江科学院院报.2004,22(6):57一90.
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[19]刘玲,赵中夏,程智.岩质高边坡预应力锚固的几个问题[J].交通科技与经济.2004(3):4一5.
[20]陈发达.岩土工程中的预应力锚索设计[J].水电勘测设计.2001(4):32一38
[21]晏成明,沈辉.岩土锚固技术应用和研究现状及其展望[J].岩土工程师.2002,14(2):14一18.
[22]刘致彬,孙志恒.岩锚新的锚固方式及锚固体系的研究[J],水力发电.l997(3):48一4.9
[23] Yzici S.and Kaiser.PK.Bond strength of grouted cable bolts[J].Int.J.Roek Mech Sci &Geomech.Absrt,1992,29(3):279一292.
[24] Littlejohn GS. Long-term performance of high capacrock anchors at Dovonport[J].Ground Engineering 1992(7):25-33.
[25]黄福德.李家峡水电站层状岩质高边坡现场大型预应力群锚加固机理试验研究[J].西北水电,1995,4:46一55.
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[27]孙立明.高边坡预应力锚索群锚试验综合分析[J].青海水力发电.1999(2):13-15
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