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为研究京沪高速铁路路基的沉降变形规律,在凤阳试验段DK854+680和DK854+740工点开展旁压试验,探求路基下深厚粘土的物理力学性质。旁压试验表明,凤阳老粘土基本承载力σo为429.06～437.89 MPa,旁压模量Em为21.50～23.65 MPa。对比该段土层室内土工试验,静力触探以及旁压试验的结果,说明室内土工试验得到的压缩模量偏小,试验数据不合理;旁压试验和静力触探数据较为一致,数据可直接用于工程设计。
In order to study the settlement and deformation law of the subgrade of Beijing-Shanghai high-speed railway, pressure test was carried out in DK854 + 680 and DK854 + 740 work stations in Fengyang test section to explore the physical and mechanical properties of subgrade thick clay. Side pressure test shows that the basic bearing capacity of Fengyang old clay is 429.06 ~ 437.89 MPa and the relative pressure modulus Em is 21.50 ~ 23.65 MPa. Comparing the results of indoor geotechnical test, static probe and side pressure test in this section of soil, it shows that the compressive modulus obtained by indoor geotechnical test is small and the test data are not reasonable. The data of side pressure test and static probe are consistent, Can be used directly in engineering design.