The response of floating pile foundations in deep deposits of soft clay is governed by the settlements within the clay deposit surrounding the piles. A long-duration thermal response test (TRT) has been performed to assess the impact of heating and cooling on the geotechnical performance of a vertically loaded slender tubular steel pile in a deep deposit of sensitive clay. The results from the instrumented test site indicate that negligible excess pore water pressures, up to 3 kPa during heating and down to −1·1 kPa during cooling, were generated in the soil adjacent to the pile for a 50 W/m heat flux. The heating rate was sufficiently low to facilitate the drainage of pore water. The influence radius for the excess pore water pressures, however, extended beyond the soil volume affected by temperature change. The absence of thermally triggered creep settlements could be explained by the overlap between the remoulded zone resulting from pile installation, the extent of the heating, and the low creep susceptibility of remoulded sensitive clay for moderate temperature changes. Furthermore, no difference in the ultimate bearing capacity was found between the thermal pile and the reference pile, which was only loaded with a serviceability load during the test series. The current test data, therefore, indicate that driven floating piles in a deep deposit of soft clay also function as heat exchanger piles with minimal detrimental effects, for similar operational conditions as used in the TRT. It should be noted, however, that other pile types that do not extensively remould the clay adjacent to the pile shaft may show more significant influence of the thermal changes.

中文翻译：

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敏感土中浮动热桩的现场试验

漂浮的桩基在软粘土深层沉积中的响应受围绕桩的粘土沉积中的沉降的支配。进行了长期热响应测试（TRT），以评估加热和冷却对敏感粘土深层沉积中竖向加载的细长管状钢管桩的岩土性能的影响。仪器测试现场的结果表明，在热流为50 W / m的情况下，在桩附近的土壤中会产生可忽略不计的多余孔隙水压力，在加热过程中最高为3 kPa，在冷却过程中最低为-1·1 kPa。加热速率足够低以利于排出孔隙水。但是，孔隙水压力过大的影响半径超出了受温度变化影响的土壤体积。没有热触发的蠕变沉降的原因可以解释为桩安装导致的重塑区之间的重叠，加热的程度以及对于中等温度变化，重塑的敏感黏土的蠕变敏感性低。此外，在热桩和基准桩之间没有发现极限承载力的差异，基准桩在测试系列中仅承受了可使用性负荷。因此，当前的测试数据表明，在与TRT相似的运行条件下，深层软黏土中的打入式浮动桩还具有最小的有害影响的热交换器桩的功能。但应注意的是，