高切坡超前支护锚杆作用机制研究

本文根据超前支护锚杆的受力特点,对高切坡超前支护锚杆的作用机制问题进行了研究,为超前支护锚杆的设计提供依据,进而为推广高切坡超前支护的设计理论提供技术支撑。     

玻璃钢锚杆支护技术在中泰公司的应用

通过施工工艺、安全技术措施的介绍及对施工时现场管理进行总结,为玻璃钢锚杆支护工艺在中泰公司的进一步推广奠定基础,逐步在中泰公司实现煤巷全部采用玻璃钢锚杆支护。     

Deformation mechanism of high-stress and broken-expansion surrounding rock and supporting optimization based on the gray correlation theory

Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deformation and damage of roadway surrounding rock and an analysis of its mechanism were carried out. The gray correlation theory was used in support scheme optimization design. First, causes and mechanism of deformation of the 1 000 m horizontal transport channel were analyzed through field investigation, laboratory test and data processing methods. We arguued that poor engineering geological conditions and deep pressure increases were the main factors, and the deformation mechanism was mainly the ground deformation pressure. Second, the gray correlation theory was used to construct supporting optimization decision method in the deep roadway. This method more comprehensively considers various factors, including construction, costs, and supporting material functions. The combined support with pre-stressed anchor cables, shotcrete layer, bolt and metal net was put forward according to the actual roadway engineering characteristics. Finally, 4 support schemes were put forward for new roadways. The gray relational theory was applied to optimizing the supporting method, undertaking technical and economic comparison to obtain the correlation degree, and accordingly the schemes were evaluated. It was concluded as follows： the best was the flexible retaining scheme using the steel strand anchor; the second best was the one using plate anchors on the top and rigid common screw steel bolt on the two sides; the ttiird was; the rigid common screw steel bolt in full section of roadway; and the worst is the planished steel rigid support. The optimized scheme was applied to the 1000 m level of new excavation roadway. The results show that the roadway surrounding rock can reach a stable state after 5 to 6 months monitoring, with a convergence rate less than 1 mm/d.     

预应力锚杆(索)抗滑桩的设计与计算

预应力锚杆（索）抗滑桩是出现于二十世纪八十年代的一种抗滑支挡结构,但其计算理论仍不完善,故根据目前抗滑桩计算中所存在的问题,对锚杆（索）抗滑桩的设计与计算方法加以改进。     

土钉墙在狭窄场地基坑支护中的应用

通过工程实例,介绍在狭窄场地利用土钉墙技术,通过合理选择土钉参数和施工方案,并在施工过程中对基坑支护进行检测等手段,在施工过程中取得了良好的效果。     

浅谈重力式深层搅拌桩在基坑支护工程中的应用

本文以具体工程实例介绍深层搅拌桩在基坑支护工程中的设计、施工、监测等方面的运用,认为它比较适用于深厚软土场地的基坑支护结构。     

囊式抗浮锚杆在工程中的应用分析

结合实际工程的地质条件和囊式锚杆抗拔力理论公式进行计算,再通过现场足尺试验分析绘制其荷载-位移曲线,同时采用有限元软件仿真模拟。对比这三个方面的数据得出规范公式偏安全,有限元软件在三维模型下能准确模拟实际工作情况。综合分析得出囊式抗浮锚杆在中风化岩中更能充分发挥其力学性能;囊式锚杆杆体在承受荷载时上部非扩体锚固段先提供抗拔力,当荷载值比较大时主要由囊袋结石体和锚杆与岩体之间的相互作用提供抗拔力。     

地基深基坑维护局部失效的补救措施

深基坑维护体系与土体及挖土作业是相互协调作用的整体,他们相互影响、相互制约、相互调整,各组成部分都应满足     

锚杆在高层建筑基坑支护施工中应用

综述了锚杆技术的作用机理,并论述了锚杆施工工艺及质量控制要点,最终列举了施工中易发生的质量问题及相应解决措施