基于断裂力学的危岩支撑-锚固联合计算方法
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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。
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.
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.
引文
[1]陈洪凯,唐红梅,叶四桥,等.危岩防治原理[M].北京:地震出版社,2006.
[2]Richard J C,Stanley A S,and David E S.Geomorphology[M].Cambridge:the University Press of Cambridge.1984.
[3]Bertran P.The rock-avalanche of February1995 at Claix(FrenchAlps)[J].Geomorphology,2003,54(3):339-346.
[4]Braathen A.,Blikra L.H.,and S.S.&Karlsen.Rock-slope fail-ure in Norway:type,geometry,deformation mechanisms and sta-bility[J].Norweigian Journal of Geology,2004,84:67-88.
[5]陈洪凯,唐红梅,叶四桥.危岩主控结构面损伤模型研究[J].应用数学和力学.2006,27(7):845-851.
[6]陈洪凯,唐红梅.危岩主控结构面疲劳断裂寿命计算方法[J].应用数学和力学.2007,28(5):575-580.
[7]CHEN Hongkai,TANG Hongmei,ZHU Hui.Research on dura-tion for perilous rock to form[J].Wseas Transactions on Aaaliedand Theoretical Mechanics,2006,1(2):169-173.
[8]陈洪凯,唐红梅.三峡水库区危岩防治技术[J].中国地质灾害与防治学报.2005,16(2):105-110.
[9]陈洪凯,唐红梅.危岩撑-锚联合支护治理方法:中国,1 0054335.7[P].2008-08-13[2008-09-02].
[10]陈洪凯,唐红梅,刘光华,等.危岩锚固-支撑联合计算方法研究[J].岩土工程学报.2004,26(3):383-388.
[11]重庆市地方标准.地质灾害防治工程设计规范[S].DB50/5029-2004:58-72.
[12]匡震邦.裂纹端部场[M].西安:西安交通大学出版社,2002.
[13]中国航空研究院.应力强度因子手册[M].北京:科学出版社,1981.
[2]Richard J C,Stanley A S,and David E S.Geomorphology[M].Cambridge:the University Press of Cambridge.1984.
[3]Bertran P.The rock-avalanche of February1995 at Claix(FrenchAlps)[J].Geomorphology,2003,54(3):339-346.
[4]Braathen A.,Blikra L.H.,and S.S.&Karlsen.Rock-slope fail-ure in Norway:type,geometry,deformation mechanisms and sta-bility[J].Norweigian Journal of Geology,2004,84:67-88.
[5]陈洪凯,唐红梅,叶四桥.危岩主控结构面损伤模型研究[J].应用数学和力学.2006,27(7):845-851.
[6]陈洪凯,唐红梅.危岩主控结构面疲劳断裂寿命计算方法[J].应用数学和力学.2007,28(5):575-580.
[7]CHEN Hongkai,TANG Hongmei,ZHU Hui.Research on dura-tion for perilous rock to form[J].Wseas Transactions on Aaaliedand Theoretical Mechanics,2006,1(2):169-173.
[8]陈洪凯,唐红梅.三峡水库区危岩防治技术[J].中国地质灾害与防治学报.2005,16(2):105-110.
[9]陈洪凯,唐红梅.危岩撑-锚联合支护治理方法:中国,1 0054335.7[P].2008-08-13[2008-09-02].
[10]陈洪凯,唐红梅,刘光华,等.危岩锚固-支撑联合计算方法研究[J].岩土工程学报.2004,26(3):383-388.
[11]重庆市地方标准.地质灾害防治工程设计规范[S].DB50/5029-2004:58-72.
[12]匡震邦.裂纹端部场[M].西安:西安交通大学出版社,2002.
[13]中国航空研究院.应力强度因子手册[M].北京:科学出版社,1981.
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