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提出了一种新型的预应力锚杆。通过大量的室内试验、现场试验研究以及基于室内试验结果进行的数值模拟分析，对这种适用于岩土工程的新型锚杆──砂固结内锚头预应力锚杆的制作工艺和锚固机理作了较为全面的研究。通过大量的室内试验，对砂固结内锚头预应力锚杆的锚固机理进行了分析论证，并探讨了多种因素对锚固力的影响。对这种新型预应力锚杆的制作原理和工艺也作了详细的研究，并且提出了切实可行的实施方案。基于内锚头砂体密实度的实际测试结果以及采用应力测量方法得到的锚孔内壁摩阻力分布的规律性认识，不仅对砂固结内锚头的锚固机理有了更深入的认识，而且对砂土强度特性的理解有了进一步的提高。其次，通过现场拉拔试验和长期观测，进一步验证了本新型锚杆的锚固性能。现场试验表明，这种新型预应力锚杆有着优越的性能，不仅施工工艺简单，操作方便，而且在安装后数分钟内即可以将预应力施加上去。从这个角度来说，它应用于抢险救灾工程或加快大型工程的施工进度意义重大。基于室内试验成果，对现场试验的围岩应力场以及锚孔内壁摩阻力的分布进行了数值模拟分析，它不但加深了对砂团结锚固机理的认识，而且验证了试验研究结果的合理性。这种新型的预应力锚杆将在岩土工程中有着非常好的应用?
A new prestressed anchor was proposed. Through a large number of laboratory tests, field test studies and numerical simulation analysis based on indoor test results, this new type of anchor used in geotechnical engineering, the process and the anchoring mechanism of anchor prestressed anchors in sand consolidation Made a more comprehensive study. Through a large number of laboratory tests, the anchoring mechanism of prestressed anchors for anchorage head in sand consolidation was analyzed and discussed, and the influence of various factors on anchoring force was discussed. This new type of prestressed anchor rod production process and technology also made a detailed study, and put forward practical implementation of the program. Based on the actual test results of the density of the inner anchor head sand body and the regularity of the friction resistance distribution of the anchor bore inner wall obtained by the stress measurement method, not only the anchor mechanism of the anchor head in sand consolidation has a deeper understanding, The understanding of the strength characteristics of sand has been further improved. Secondly, the anchoring performance of this new type of anchor was further verified by field drawing test and long-term observation. Field tests show that this new type of prestressed anchor has superior performance, not only simple construction process, easy operation, but also can be applied within a few minutes after the installation of prestressing up. From this perspective, it is of great significance to apply it to disaster relief work or speed up the construction of large-scale projects. Based on the indoor test results, numerical simulation analysis of the stress field of the surrounding rock and the distribution of the frictional resistance of the inner wall of the anchor hole in the field test not only deepens the understanding of the anchoring mechanism of sand solidification, but also verifies the rationality of the experimental results. This new type of prestressed anchor will have a very good application in geotechnical engineering?