基于桩土作用效应的h型抗滑桩全过程受力机理与试验研究

Prevention of geological disasters in China mountain roadhas been faced with severe situation. At present，we have the tendencies that"pay more attention to disaster mechanism research, and pay less attention to the disasters control technology research",which lead to new geological disaster prevention and retaining technology theory serious lag behind engineering practice needs..This project focuses on h type of anti-slide pile as the research object, make the basic scientific research of mechanism between pile and soil and total process of structure stress characteristics and antislide performance. Through the theoretical research, numerical analysis and physical simulation, this project will reveal the load distribution law and internal force transmission relationships of the h anti-slide pile, and put forward to the pile-soil system parameters and stress analysis method by lateral soilpressure changes law along the depth of slope. Establish a scientific calculation model through pile-soil interaction effect and build standardized design method of h anti-slide pile on basis of typical geotechnical conditions, in order to provide the effective guidance theory of pile-soil quantitative relationship and structure design calculation for big thrust landslide prevention. .At the same time, this project will do the experiment to quantitative contrast beteen h anti-slide pile and ordinary anti-slide pile and double row anti-slide pile and anchor cable anti-slide pile in relation to performance level and anti-slide effect tech-economic rationality..

我国地质灾害防治一直面临严峻形势。目前研究多集中于灾害机理与评估，而在灾害治理技术方面则重视不够，导致地质灾害新型支挡防治技术的理论研究严重滞后于工程实践需要。. 本课题h型组合式超静定抗滑桩为研究对象，对h型抗滑桩的桩-土作用机理、结构全过程受力特性与抗滑性能进行基础科学研究。通过理论研究、数值分析、物理模拟，揭示h型抗滑桩荷载分布规律和内力传递关系，提出桩-土体系参数及侧向土压力沿深度变化的h型抗滑桩受力分析方法，建立科学的桩-土相互作用效应下h型抗滑桩计算模型和典型岩土条件下此类组合式抗滑桩的具体计算方法与规范化设计手段，为大推力滑坡防治实际应用中h型抗滑桩桩-土关系的定量表达与结构设计计算提供有效理论指导。. 同时，通过模型试验量化对比h型抗滑桩与普通抗滑桩、双排抗滑桩、锚索抗滑桩的受荷性能状态及抗滑效果技术经济性。

国内外目前多集中于灾害机理与评估方面的研究，在灾害治理技术方面的研究投入较少，特别是新型抗滑支挡防治技术的理论研究往往无法满足工程实践需要。本课题针对组合式超静定抗滑桩开展系统研究，在h型抗滑桩的桩-土作用机理、结构全过程受力特性与抗滑性能方面取得了卓有成效的探索。运用理论分析、数值模拟、物理试验，明确了h型抗滑桩荷载分布和结构应力传递规律，建立了桩-土体系参数及侧向土压力沿深度变化的h型抗滑桩受力分析方法，提出了科学的桩-土相互作用效应下h型抗滑桩计算模型和典型岩土条件下此类组合式抗滑桩的具体计算方法与规范化设计手段，为大推力滑坡防治实际应用中h型抗滑桩桩-土关系的定量表达与结构设计计算提供有效理论指导。同时，通过模型试验量化对比h型抗滑桩与普通抗滑桩、双排抗滑桩、锚索抗滑桩的受荷性能状态及抗滑效果技术经济性。