重庆渝涪路黄草山危岩形成机理及治理对策
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摘要
以渝涪高速公路黄草山危岩为例,论述了危岩体地形地貌及地质构造特征,分析了其形成机理,得出在其发育过程中具有明显的链式规律,包括宏观链及微观链;将危岩体划分为群体及单体两类,分析了影响危岩形成的主要因素与过程。采用FLAC有限差分方法研究了凹腔及其上部岩体变形破坏的发展趋势。结果表明,危岩体的形成主要是由于岩腔形成过程中危岩体顶部受拉,形成卸荷带裂缝,进而促进了危岩体发生以受拉破坏为主的崩塌。拟定"表层风化破碎带清除+危岩体主动防护网+危岩区格构锚固+喷混凝土封闭+浆砌块石支撑+排水工程"的治理方案。
Huangcaoshan crags in Chongqing-Fulin highway was taken as an example.Its geological environment and geomorphological characteristics of geological hazards were expouned and the formation mechanism was analyzed.The chain rule including macro and micro level of crags development,was concluded.The crags were divided into two types of group and monomer to analyze the main factors and processes impact the crags formation.Finite difference method of FLAC was used to study the development trend of deformation at the cavity and the upper part of rockmass.The result shows that the reason of crags' formation is mainly that the tension on the top of crags in the process of rock cavity formation induces unloading cracks zone which thereby promotes possibility of the tension damage collapse in crags.An control program,which including slope surface cleaning,active protection systems,slope lattice frame anchoring,shotcrete closing,stone masonry support and drainage engineering,was drew up.
Huangcaoshan crags in Chongqing-Fulin highway was taken as an example.Its geological environment and geomorphological characteristics of geological hazards were expouned and the formation mechanism was analyzed.The chain rule including macro and micro level of crags development,was concluded.The crags were divided into two types of group and monomer to analyze the main factors and processes impact the crags formation.Finite difference method of FLAC was used to study the development trend of deformation at the cavity and the upper part of rockmass.The result shows that the reason of crags' formation is mainly that the tension on the top of crags in the process of rock cavity formation induces unloading cracks zone which thereby promotes possibility of the tension damage collapse in crags.An control program,which including slope surface cleaning,active protection systems,slope lattice frame anchoring,shotcrete closing,stone masonry support and drainage engineering,was drew up.
引文
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[2]CHEN Hong-kai,TANG Hong-mei.Chained mechanism and moving routine for perilous rock to avalanche in the area of the three gorges reservoir of China[J].The Proceedings of China Association for Science and Techenology,2006,3(1):501 -506.
[3]陈洪凯.三峡库区危岩链式规律的地貌学解译[J].重庆交通大学学报:自然科学版,2008,27(1):92-95. CHEN Hong-kai.Geo morphology research on chained regularity of perilous rock in the area of the Three Gorges Reservoir[J].Journal of Chongqing Jiaotong University:Natural Science,2008,27(1): 92-95.
[4]CHEN Hong-kai,TANG Hong-mei,YE Si-qiao.Research on damage model of control fissure in perilous rock[J].Applied Mathematics and Mechanics,2006,27(7):967 -974.
[5]CHEN Hong-kai,TANG Hong-mei,WANG Rong,et al.Research on equivalent processes of rock mass parameters with anchor pile [J].Applied Mathematics and Mechanics,2001,22(8 ):965 - 971.
[6]陈洪凯,唐红梅,鲜学福.缓倾角层状岩体边坡链式演化规律[J].兰州大学学报:自然科学版,2009,45(1):20-25. CHEN Hong-kai,TANG Hong-mei,XIAN Xue-fu.Chained developing pattern for rock slopes with gentle dipstrata[J].Journal of Lanzhou University:Natural Science,2009,45(1):20-25.
[7]王林峰,陈洪凯.危岩链式规律的力学演绎[J].重庆建筑大学学报,2008,30(2):94-97. ??WANG Lin-feng,CHEN Hong-kai.Mechanical illation of chained regularity of perilous rock[J].Journal of Chongqing Architecture University,2008,30(2):94 -97.
[8]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.
[9]胡厚田.崩塌与落石[M].北京:中国铁道出版杜,1989.
[10]陈洪凯,唐红梅,王林峰,等.危岩崩塌演化理论及应用[M].北京:科学出版社,2009.
[11]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.
[12]陈育民,徐鼎平.FLAC/FLAC~(3D)基础与工程实例[M].北京:中国水利水电出版社,2009.
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