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中文摘要：
自钻式旁压试验（SBPT）因其扰动小、测试深度大、可以获得应力一应变、超孔隙水压力．时间等数据，在确定地基土性参数和地基承载力上有广阔的应用前景。然而由于用以解释SBPT的柱孔扩张理论（Gibson解）所采用的平面应变假设与实际旁压腔几何特征存在差异，导致试验所确定的黏土不排水剪切强度Su与其他原位试验或室内试验结果存在差别。针对旁压腔几何尺寸及应变区间的选择对确定Su的影响，基于修正剑桥模型，采用低渗透系数控制加载过程中不排水条件，利用有限元法模拟SBPT，建议了不同应力历史下确定S。的应变区间，并给出考虑几何尺寸影响时相应应变区间上Su的修正系数。
英文摘要：
The self-boring pressuremeter（SBP） has proved to be a useful tool for geotechnical engineering to determine the in situ properties of soils due to its small disturbance, long measurement depth, versatile data such as stress-stain, excess pore pressure-time. The conventional interpretation methods of the SBP testing （Gibson et al, 1961） have typically been based on the one-dimensional expansion of a cylindrical cavity by assuming that the pressuremeter can be treated as infinitely long, leading to an overestimation of soil shear strength by pressuremeter testing. The study of two-dimensional geometry effects and choices of strain range in pressuremeter curves on undrained shear strength based on modified Cam clay model is performed. Strain ranges for different stress histories have been proposed by comparing the results of finite element method with the solutions of cylindrical cavity expansion. And corrections of undrained strength in proposed strain range for the effect of length diameter ratio of SBP are carried out.
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