瓦厂特大桥桐梓端岸坡稳定性分析-《高速铁路技术》

文章信息/Info

Title:: Stability Analysis for Bank Slopes at Tongzi End of Wachang Super Major Bridge

作者:: 蔡家鹏; 贺玉龙; 喻洪平; 赵文; 1. 中铁二院(成都)建设发展有限责任公司, 成都 610031;
2. 西南交通大学, 成都 610031

Author(s):: CAI Jiapeng; HE Yulong; YU Hongping; ZHAO Wen; 1. CREEC(Chengdu) Construction and Development Co., Ltd., Chengdu 610031, China;
2. Southwest Jiaotong University, Chengdu 610031, China

Keywords:: Wachang Super Major Bridge|stability of bank slope|stability angle of bank slope|safety distance

摘要:: 峡谷高陡岸坡稳定性对线路方案和桥基位置的确定具有重要意义，本文在综合地质勘察成果基础上，从岩体结构特征、卸荷裂隙等方面分析了瓦厂特大桥桐梓端的岸坡工程地质条件；在稳定性初步分析基础上，利用考虑地下水作用的岩体质量与稳定边坡坡度之间的关系确定了桐梓端岸坡稳定角；利用应力影响系数与岸坡坡度、荷载强度、桥基宽度之间的关系确定了桐梓端桥基安全距离，为桥位确定和岸坡处理提供依据。经研究发现：（1）根据边坡稳定坡角经验公式，瓦厂特大桥桐梓端天然岸坡稳定角为72°，利用桥基安全距离经验公式确定了桥基安全距离为10 m；（2）桐梓岸坡危岩体对11号主墩有重大影响，必须对陡壁危岩进行综合处治。

Abstract:: The stability of high and steep bank slopes is of great significance to the route scheme and the position of bridge foundation. Based on the comprehensive geological survey results, this paper analyzes the geological conditions of the bank slope at Tongzi end of Wachang Super Major Bridge in terms of the structural characteristics of rock mass and the relief joints. On the basis of preliminary stability analysis, the stability angle of bank slope at Tongzi end is determined by using the relationship between rock mass quality and stabilized slope gradient considering the effect of groundwater. The safety distance of the bridge foundation at Tongzi end is determined by using the relationship between stress influence coefficient and bank slope gradient, load intensity, and bridge foundation width, which provides a basis for bridge location determination and bank slope treatment. It is found that:(1) According to the empirical formula of slope stability angle, the natural slope stability angle at Tongzi end of Wachang Super Major Bridge is 72, and the safe distance of bridge foundation is determined to be 10 m by using the empirical formula of bridge foundation safety distance. (2) The dangerous rock mass on the bank slope at Tongzi end has a great influence on No.11 main pier, so it is necessary to comprehensively treat the steep dangerous rock.