基于静载或静力贯入的地基压实度检测机理与关键技术研究

The compactness degree is an important quality control index for ground foundation or roadbed construction,and the existing compactness degree detection techniques are difficult for both detection efficiency and precision to meet the engineering requirements at the same time.Therefore,the research of a new fast accurate detection technique of the compactness degree of ground foundation or roadbed is of great theoretical and practical significance.The project intends to transplant static load or static penetration test into an exclusive car with professional data analysis and test control software to achieve automatic fast detection of the compactness degree.Consequently,the indoor and outdoor static load or static penetration tests will be firstly performed to investigate the penetration deformation mechanism and penetration resistance law of the ground foundation or roadbed,then a series of key test techniques for the compactness degree detection is proposed.Secondly,through exploring such as relationship models between the deformation and porosity ratio,the load and displacement,the compactness degree and original porosity ratio,a new approach based on the principle of static load or static penetration test is developed to determine the compactness degree of ground foundation or roadbed.Afterwards,based on the above-mentioned models,a test control and data analysis software with visual interface is opened up,and it provides a technical guarantee for the fast detection of compactness degree of ground foundation or roadbed.Finally,the feasibility and rationality of the detection techniques are investigated through practical engineering detection,and the corresponding operational standard code will be compiled to achieve the engineering application.

压实度是地基或路基填筑施工的重要质量控制指标，现有压实度检测技术的检测效率和精度难以同时满足工程要求，因此，开展地基或路基压实度新的准确快速检测技术研究具有重要的理论与工程实际意义。本项目拟将静载或静力贯入试验移植到专用汽车上，配以专用数据分析和测试控制软件，以实现地基或路基压实度的自动快速检测，为此，将首先通过地基室内外静载或静力贯入试验，探讨贯入变形机理与贯入阻力变化规律，提出压实度检测试验关键技术；其次，通过探讨压实体变形与孔隙率关系模型、以地基或路基初始孔隙率为主要参量的静力贯入荷载与位移关系模型和压实度与初始孔隙率关系模型，建立基于静载或静力贯入的地基或路基压实度确定方法；然后，在上述模型研究基础上，开发出基于可视化界面的测试过程控制与数据分析软件，为压实度的快速检测提供技术保证；最后，通过实体工程检测，探讨其检测技术的适用性与合理性，并编制压实度检测的操作规程，以实现工程应用。

压实度是评价地基或路基施工质量的重要指标，现有压实度检测技术的检测效率和精度难以同时满足工程建设的需要，因此，开展准确快速的地基或路基压实度检测新技术研究具有重要的理论与工程实际意义。本项目首先通过路基室内外静力贯入试验，探讨了静力贯入路基变形机理，提出了压实度检测试验关键技术；其次，基于散体材料力学理论获得了考虑散体材料特征的贯入荷载作用下路基土体应力分布规律，基于孔隙介质力学理论推导了路基土体变形与变形模量、泊松比和孔隙率等力学指标的关系模型，在此基础上，基于分层总和法和分级加载思想建立了以路基初始孔隙率为主要参量的静力贯入荷载-沉降分析模型，进而结合压实度与初始孔隙率关系模型建立了基于静力贯入试验的路基压实度快速检测方法；然后，在上述理论研究基础上，开发出了基于可视化界面的测试过程控制与数据分析软件，为压实度的快速检测提供技术保证；最后，通过实体工程检测，验证了该检测技术的适用性与合理性，并将静力贯入试验移植到专用汽车上，实现了地基或路基压实度的自动快速检测。