半煤岩软底巷道底鼓控制技术

己15半煤岩软底巷道底鼓一直是困扰平煤集团三环公司的重大问题．以该巷道大范围内的岩体为研究对象，通过对巷道底鼓影响因素的理论分析，得出围岩性质、地质构造和支护形式是产生底鼓的主要因素，提出了锚注加固底板控制巷道底鼓的方案，并对其支护加固机理进行了研究分析．采用数值模拟软件，对巷道使用普通锚网支护和锚注支护加固底板的围岩变形破坏规律进行了数值模拟，对锚注加固底板前后围岩的应力、位移及塑性区的变化情况进行了系统的分析．现场结果表明：锚注加固技术显著提高了底板岩体的强度和承载能力，极大的提高了巷道的支护效果，有效的控制了半煤岩软底巷道的底鼓变形．

Control Technique of Floor Heave in Semi Coal and Rock Roadway with Weak Floor

For many years, the floor heave of Ji-15 semi coal and rock roadway has been a serious problem puzzling the 3rd coal mine of Pingdingshan Coal Industry Group Co. Ltd. Aiming at a large area of rock mass around the roadway, the factors affecting the floor heave were analyzed, showing that the physical properties of surrounding rock and the geological structure and support form are the main factors for floor heave. With the recognition of the mechanism of the floor heave, an effective bolt-grouting support technique was studied and designed to control the floor heave. By using the numerical simulation software, the deformation and failure rules of bolt-mesh support and bolt-grouting support for roadway were simulated, the plastic zone, the stresses distribution field, and the displacement vector around the roadway in these two situations were also analyzed in detail. The in-situ measurement shows that the strength and bearing capacity of coal seam floor for bolt-grouting roadway are greatly increased, good support effects achieved, therefore, the deformation of the floor heave of roadway can be controlled effectively.