【摘要】 土钉支护技术在深基坑开挖和支护中已得到了广泛的应用,但对其工作机制和计算方法的研究尚不完善。目前数值模拟算法较多,但其本构模型准确地选择及相关参数的确定需要进行大量的三轴试验或真三轴试验。基于此,提出3个假设,建立简单的计算模型,并对土钉的工作机制深入研究,得到土钉拉力的"二半支抛物线"分布规律,推导出土钉支护设计的解析算法相关公式。以徐州彭城地下广场深基坑土钉支护工程为例,进行土钉拉力现场测试,对基坑水平位移、沉降进行观测,所测数据验证了文中公式的可靠性,为类似基坑工程的设计和施工提供参考。更多还原

【Abstract】 The technique of soil nailing has already got an extensive application to deep foundation pit engineering, but the research of its work mechanism and the calculation method is still not perfect. Now the numerical simulation experiments are prevalent; but it must to do a large numbers of triaxial or true triaxial tests to gain the exact model and other parameters for local soil. So a simple calculation model is founded based on three supposes, the writer also studies on the work mechanism of soil nailing and finds the regulation that Curve of nail stress is "Two half parabola", and the concerned formulas is deduced. Combining the Pengcheng underground square engineering, the data of displacement for pit are measured. The stresses of soil nailing are also measured; these data verifies the accuracy of the formulas. The analytical algorithm is worth for reference in the similar case.更多还原