基于断裂力学的危岩支撑-锚固联合计算方法

金属矿山 ›› 2009, Vol. 39 ›› Issue (03): 10-13+23.

基于断裂力学的危岩支撑-锚固联合计算方法

陈洪凯^1,2，鲜学福¹，唐红梅^1,2

1.重庆大学；2.重庆交通大学

出版日期:2009-03-14 发布日期:2012-01-30
基金资助:
* 国家自然科学基金项目(编号：50678182)。

Calculation Method for the Combined Support-Anchorage for Perilous Rock based on Fracture Mechanics

Chen Hongkai^1,2，Xian Xuefu¹，Tang Hongmei^1,2

1.Chongqing University；2.Chongqing Jiaotong University

Online:2009-03-14 Published:2012-01-30

摘要/Abstract

摘要： 危岩是山区及开挖边坡表面广泛分布、致灾严重的一种地质灾害，在岩腔比较发育时可采用支撑-锚固联合治理技术予以有效防治。通过将作用在危岩体上的荷载变换为作用在主控结构面的法向力、切向力和弯矩，基于断裂力学方法建立了主控结构面尖端岩石断裂角和联合断裂强度因子计算方法，提出了危岩稳定系数计算式；运用断裂力学建立了危岩支撑力和锚固力计算方法，提出了确定支撑体断面尺寸和锚杆数的方法。实例分析显示了这种方法的合理性和有效性，是对相关技术规范的有效补充和完善。

关键词: 岩体力学, 危岩, 断裂强度因子, 支撑与锚固, 计算方法

Abstract: Perilous rock is widely distributed in mountainous areas and on excavated slopes and can lead to a serious geological disaster.Where there is developed rock cavity, support-anchorage combined technology can be used to effectively control the perilous rock.By converting the load on perilous rock into the normal force, tangential force and bending moment acting on the main controlling structural plane, a calculation method is established for the fracture angle and joint fracture strength factor of rock near the end of control fissure in perilous rock.Based on this, the formula for calculating the stability coefficient of perilous rock is proposed.A calculation method for the support and anchorage force needed in controlling perilous rock is established based on fracture mechanics and then a method is proposed on this base for determining the sectional dimensions of support and the anchor bolt number.Real case study has proven the rationality and effectiveness of this method.It is an effective supplement and improvement to the relevant technical specifications.

Key words: Rockmass mechanics, Perilous rock, Fracture strength factor, Support and anchorage, Calculation method

陈洪凯, 鲜学福, 唐红梅. 基于断裂力学的危岩支撑-锚固联合计算方法[J]. 金属矿山, 2009, 39(03): 10-13+23.

CHEN Hong-Kai, XIAN Xue-Fu, TANG Hong-Mei. Calculation Method for the Combined Support-Anchorage for Perilous Rock based on Fracture Mechanics[J]. Metal Mine, 2009, 39(03): 10-13+23.

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