北京市门头沟区高边坡预应力锚索格构梁体系的力学特性及设计优化  

Mechanical characteristics of prestressed anchorage cable-lattice system used for high slope at Beijing Mentougou district and its design optimization

作　　者：陈默[1] 沈宇鹏[2,3] 赵久欢[2] 毛凌峰[2] 何永贵[2] 

机构地区：[1]中航勘察设计研究院有限公司,北京100098 [2]北京交通大学土木建筑工程学院,北京100044 [3]轨道工程北京市重点实验室,北京100044

出　　处：《铁道建筑》2015年第5期108-112,共5页Railway Engineering

基　　金：国家自然科学基金项目(41271072);中央高校基本科研业务费专项资金资助项目(2011JBZ009)

摘　　要：研究了预应力锚索格构挡墙的加固机理,并结合北京市门头沟区一高边坡工程,采用现场测试、数值分析等手段,分析了此类支护结构的受力机理和墙背土压力特征,最后通过正交分析,以边坡安全系数为控制指标,提出了该类支护结构的优化设计参数。研究结论:预应力锚索格构挡墙通过锚索将下滑力传递给深层稳定的岩土层中,形成一种边坡主动抗滑体系,由于锚索作用,墙后竖向土压力沿墙高应力重分布,出现多个应力峰值,水平土压力在墙高5 m处最大,而非墙底端,并且沿墙高方向呈连续波浪形分布;正交模型试验得出抗滑桩长度、锚索预应力、锚固段长度是影响支护效果最主要的因素。Combing with high slope engineering in Beijing Mentougou, the paper studied the reinforcement mechanism of prestressed anchorage cable-lattice retaining wall, analyzed the stress mechanism and wall back soil pressure characteristics for this kind of supporting structure by field test and numerical analysis, and put forward the optimization design parameters by taking slope safety coefficient as the control index through orthogonal analysis. The conclusion showed that prestressed anchorage cable-lattice retaining wall transfers the sliding force to deep and stable soil by the anchorage cable,which forms a kind of active slope anti-slide system ,vertical soil pressure of wall back distributes along the wall by anchorage cable effect and there are several peak values of stress, horizontal soil pressure is maximal at 5 m height of the wall instead of at the bottom of wall and shows a continuous wave shape distribution along the wall, and the anti-slide pile length, anchorage cable prestress and anchoring section length are the main factors influencing the supporting effect by orthogonal experiment results.

关 键 词：预应力锚索格构梁 抗滑桩 土压力 支护机理 正交优化 

分 类 号：TU452[建筑科学—岩土工程]