加筋风积砂地基承载力试验研究及计算分析

针对沙漠地区风积砂土特殊的物理力学性质，以土工格栅为加筋材料对风积砂土进行加固。通过室内模型试验，对未加筋的风积砂土和15种布筋方式下的加筋风积砂地基承载力进行了试验研究。测定了各种布筋方式下加筋风积砂土的极限破坏荷载，分析了加筋土的变形以及应力扩散情况。根据试验结果，总结了不同布筋方式及不同埋深条件下，加筋风积砂地基承载力的变化规律，并推荐片式双层格栅为施工中有效的布筋方式，此布筋方式下的加筋风积砂地基承载力较风积砂地基承载力增加1．2倍。提出了加筋风积砂土的强度机理和破坏模式，建立了无埋深条件下片式单层格栅加筋风积砂地基承载力的计算公式。经试验验证，所得结果具有实用价值。

MODEL TESTING STUDY AND CALCULATING ANALYSIS OF BEARING CAPACITY ON THE REINFORCED AEOLIAN SANDS GROUND

Because of the special physical and mechanical property of the aeolian sands in the desert,the aeolian sands is reinforced with the geogrids. Through the indoor model tests,the bearing capacity of reinforced aeolian sands with fifteen reinforcing plans and aeolian sands without reinforcement is studied. The bearing capacity,the deformation,and the stress of aeolian sands,are determined. On the basis of test results,the variation of bearing capacity of ground of reinforced aeolian sands is analyzed with different reinforcing plans and various intensities. Two-layer geogrids is recommended as the effective reinforcing plan,ground reinforced with reinforcement has bearing capacity 1.2 times higher than that of without reinforcement. Moreover,the strength mechanism and damaging pattern of reinforced aeolian sands are put forward. Finally,the calculation formulas of bearing capacity of ground of aeolian sands reinforced one-layer geogrids without bearing depth are established. The formulas are proved by the test results.