摘要
拦石墙是危岩主要的被动防治技术之一。通常布设在陡崖或陡坡脚前适当部位。而布设在陡崖或陡坡脚前的距离及自身高度、宽度等结构尺寸均应通过计算确定,但计算理论迄今尚未完善。作者将危岩落石作用于拦石墙的传力机理概化为落石→堤→桩及板→地基的传力过程。落石作用于挡土墙后在挡土墙内的扩散范围为一锥体,建立了落石对拦石墙的冲击力及其在土堤内部扩散的计算方法,量化了落石在墙体内的冲击深度及扩散角,即锥体的高度及顶角张开度。将拦石墙土堤等效为连续土板,则可将拦石墙概化为连续桩板结构并将冲击力均布作用于扩散锥。据此便可运用结构力学方法进行拦石墙内力计算。运用论文建立的拦石墙计算方法在三峡水库区万州太白岩实施了3km长的示范工程。多次随机落石事件显示了该结构的可靠性及有效性。
As one of passive control technique, volley-unstable rock retaining wall is often constructed at some site beforecliff or steep slope. Distance between volley-unstable rock retaining wall and cliff or steep slope and structure of volleyunstable rock wall such as height, width etc. are identified through calculation, however calculation method was imperfect hitherto. The author generalizes that transmit process of impact force in volley-unstable rock retaining wall is from unstable rock into rock-fall, dam, pile-plate and ground in this paper. Spread range of impact force in volley-unstable rock retaining wall shows a cone. Calculation method of impact force and spread range is established, which can solve impact depth and spread angle of rack-fall impact in the wall, i.e. height and top open angle of the cone. Further, taking the wall as continuous soil plate structure, volley-unstable rock retaining wall is generalized as continuous pile-plate structure and impact force of fall-rock acts normally in spread cone, in which can calculate inner force of the wail in structure mechanics. As an example, three kilometers exemplary project in Wanzhou Taibaiyan unstable rock in the Three Gorges Reservoir has been implemented in the method. It is proved that many random rock-falls show effective and the reliable of volley-unstable rock wall developed in the Paper.
出处
《中国地质灾害与防治学报》
CSCD
2005年第3期12-15,30,共5页
The Chinese Journal of Geological Hazard and Control
基金
交通部重点科技基金项目(95060233)
西部交通项目(200332822047)
交通部人才基金项目(95050508)
高等学校重点实验室访问学者基金资助项目及国家十五科技攻关项目(2001BA604A023)成果之一.
关键词
危岩
拦石墙
落石冲击
扩散
连续桩板结构
计算方法
万州太白岩
unstable rock
volley-unstable rock wall
rock-fall impact
spread
continue pile-plate structure
calculation method
Taibaiyan of Wanzhou
