加筋风砂土抗拔试验研究(II)——抗拔载荷能力计算分析

通过对典型沙地土样的分析试验和室内模型试验,对未加筋风砂土和土工格栅的15种不同加筋条件下风砂土地基扩展基础的上拔承载性能进行了试验研究.根据试验结果,确定了加筋风砂土地基扩展基础承受上拔荷载的计算模式和理论计算公式.研究了分别由风砂土和土工格栅引起的上拔承载能力,按计算值和实测值分项进行了对比分析,提出了有效的土工格栅加筋形式,即平铺一层和二层土工格栅.提出了进一步需要研究的"锚固长度"问题.

UPLIFT TEST STUDY ON REINFORCED AEOLIAN SAND (II)--ANALYSIS AND CALCULATION OF UPLIFT BEARING CAPACITY

Through soil analysis tests and model tests on aeolian sand of typical sand land,the uplift bearing capacity of aeolian sand of spread foundation was tested under 15 kinds of geogrid reinforced conditions. According to the test results,calculation model is defined,and theoretical calculation formula is put forward on uplift bearing capacity of geogrid reinforced sand land of spread foundation. The calculated and measured data are compared and they are closed to each other. The ultimate uplift bearing capacity is researched alone by the tests for sand land and geogrid reinforced materials,respectively. The difference between calculated and measured data is analysed. The effective reinforcement ways of building geogrid,that is,one and two layer geogrids,are proposed. Finally,the problems to be further studied are pointed out.