旋压触探融合核磁能谱的地铁上覆土(岩)层隐伏病患原位识别方法研究

Accurate identification of potential defects is an important issue in the field of geotechnical engineering. So far, research on the subway overlying strata potential defects identification is very limited, particularly at multiple porosity media condition. A comprehensive research method was used to study the relationship between the rock or soil strength and porosity with the multiple-medium, as well as analyze the relationship between the multiple-medium and the potential defects. Five kinds of physical model were established to determine the influence of rock or soil property on the drilling parameters and reveal the theoretical relationship between drilling parameters and strength parameters. In addition, the influence of confining pressure and water content on the strength of nuclear magnetic was studied, and the corresponding energy spectrum was established according to the Nuclear Magnetic Strength, rock properties and porosity. Moreover, a three-dimensional physical model was used to study the effect of porosity character on the rock or soil strength and the nuclear magnetic energy spectrum, so that a dual-source coupled fuzzy relation model which includes the reliability of multi-medium was established. Filed test was carried out to obtain the rock and soil strength and nuclear magnetic strength, and modify the strength theory and the fuzzy model by comparing the field test, numerical simulation, field exploration results. This study provides a new method for the accurate identification of potential defects of the subway overlying strata.

地铁上覆层隐伏病患诱发塌陷严重影响交通安全，隐伏病患准确排除是降减塌陷发生的重要途径，而土(岩)多重孔隙介质演变隐伏病患识别方法一直未得到彻底解决。项目采用理论、实验、计算和工程应用结合研究方法，研究土(岩)体强度、孔隙率随多重介质变化规律，分析多重介质演变与隐伏病患关系。建立5类土(岩)物理模型，研究岩性、孔隙率对随钻力学响应量(钻压、扭矩、转速、钻进速度)影响规律，建立力学响应量与强度参数(抗压、抗剪强度)理论关系。研究围压、含水率对核磁强度特征影响，建立核磁强度与岩性、孔隙率对应联系核磁能谱。建立三维物理模型，研究孔隙特征对强度、核磁能谱影响，构建含多重介质信度指标的双源耦合模糊关系模型。在隐患区开展现场测试，给出力学、核磁强度数值，与数值模拟和现场勘查结果对比，修正强度理论关系和模糊模型，形成旋压触探融合核磁能谱识别隐伏病患分析方法。为地铁上覆层塌陷快速精准诊治提供新思路和新方法。

地铁上覆层隐伏病患诱发塌陷严重影响交通安全，隐伏病患准确排除是降减塌陷发生的重要途径，而土(岩)多重孔隙介质演变隐伏病患识别方法一直未得到彻底解决。项目采用理论、实验、计算和工程应用结合研究方法，研究土(岩)体强度、孔隙率随多重介质变化规律，分析多重介质演变与隐伏病患关系。建立5类土(岩)物理模型，研究岩性、孔隙率对随钻力学响应量(钻压、扭矩、转速、钻进速度)影响规律，建立力学响应量与强度参数(抗压、抗剪强度)理论关系。研究围压、含水率对核磁强度特征影响，建立核磁强度与岩性、孔隙率对应联系核磁能谱。建立三维物理模型，研究孔隙特征对强度、核磁能谱影响，构建含多重介质信度指标的双源耦合模糊关系模型。在隐患区开展现场测试，给出力学、核磁强度数值，与数值模拟和现场勘查结果对比，修正强度理论关系和模糊模型，形成旋压触探融合核磁能谱识别隐伏病患分析方法。为地铁上覆层塌陷快速精准诊治提供新思路和新方法。