吹填软土植物垫层真空预压现场试验研究

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摘要针对崇明岛吹填软土地基砂源紧缺、人机进场与施工困难、无法满足农业用地需求等状况，提出采用现场芦苇代替砂垫层进行真空预压地基处理试验研究，并与无垫层真空预压进行对比。通过试验研究发现：由于有垫层与无垫层导致真空预压法的加载规律不同，使得地基土的固结特性与效果也不同。无芦苇垫层时真空度经过主管、塑料排水板，短时间内即加载到土体上，地基前期固结速率比较快，但速率降低也很快，地基沉降达到稳定的时间短、所完成的沉降量小；有芦苇垫层时真空度需经过芦苇垫层的扩散缓慢地加载到土体上，负压荷载加到土体上的历时长，地基前期固结速率比较慢，但速率降低也慢，沉降速率在经历约8 d、沉降量在经历约33 d后才与前者相当，但最终所完成的沉降量却比无垫层时高出约10.4%，地基承载力也略高于无垫层情况。研究结果表明，植物垫层真空预压处理吹填软土地基是可行的，且由于其效果好、成本低，值得在类似工程中推广应用。

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关键词 ：土力学, 吹填软土, 植物垫层, 无垫层, 现场试验, 渐进加载, 短期加载

Abstract：For the very soft dredger fill site，it seems very hard for workers and construction machine standing and moving on the ground surface. That site is intended to be in use for agriculture. To meet such a need，the ground improvement should be implemented. Due to lack of the resources of sands，the sand cushion commonly used in the conventional method is replaced by reeds acted as drains in the vacuum preloading tests. Comparisons between results of vacuum preloading tests with and without bedding layer are obtained. Due to different loading processes of vacuum preloading tests with and without bedding layer，effects of consolidations of foundation vary considerably. In the case with no reed bedding layer，the velocity of consolidation in early stage is faster with small foundation settlement and low time cost，but this velocity decreases faster with the reduction in the settlement of the ground. In another case with reed bedding layer，the velocity of consolidation in early stage is relatively slow with some decreasing rate. It lasts about 33 d to make the same settlement magnitude as the site with no the reed cushion，and makes more 10.4% of total settlement than with no the reed cushion at the end. Moreover，the bearing capacity is higher than without reed layer. It shows that vacuum preloading method with reed bedding layer is a better ground treatment method. It has greater effects，shorter construction period and lower cost. It could be widely spread in the future construction.

Key words： soil mechanics dredger fill stalk cushion no cushion in-situ test asymptotic loading short-term loading

收稿日期: 2010-11-04

引用本文:

武亚军1，邹道敏1，唐军武2，刘伟2. 吹填软土植物垫层真空预压现场试验研究[J]. 岩石力学与工程学报, 2011, 30(S2): 3574-3583.
WU Yajun1，ZOU Daomin1，TANG Junwu2，LIU Wei2. STUDY OF GROUND TREATMENT OF DREDGER FILL IN-SITU TEST WITH STALK CUSHION USING VACUUM PRELOADING METHOD. , 2011, 30(S2): 3574-3583.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/3574

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