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西北湿陷性黄土区劈裂注浆试验及地基加固应用
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Split Grouting Test and Application of Foundation Reinforcement in Collapsible Loess Area in Northwest China
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    摘要:

    为验证劈裂注浆加固法在处理西北湿陷性黄土地基的有效性与实用性,并指导安全施工,首先在加固建筑物所在场地进行劈裂注浆现场试验,56 d后分别对天然地基与注浆后复合地基进行静载荷试验;在此基础上,进行30 d浸水试验,采集注浆微观图、承载力及湿陷量等原始数据. 利用试验结果,并结合现场待加固建筑,用同种材料及试验方法等对其进行纠倾加固. 结果表明:在一次注浆最大压力为0.3 MPa、二次注浆最大压力为0.6 MPa的条件下,采用1 ∶ 1(质量比)水泥浆液的钢花管两次、分层劈裂注浆法表现出了良好的劈裂效果;劈裂注浆法加固处理后的黄土地基承载力较原有地基提高了近3倍,极大地改善了黄土的工程性质;注浆后能够有效消除黄土超过67%的湿陷性;建筑物发生均匀沉降,稳定性较好. 同时,提出了一种适用于桩径较小的基于桩土应力比计算的复合地基沉降计算新方法.

    Abstract:

    In order to verify the effectiveness and practicability of splitting grouting reinforcement method in treating collapsible loess foundation in northwest China,and to guide the safety construction,firstly,the split grouting field experiment was carried out on the site where the reinforced building is located. After 56 days,static load tests were carried out on the natural foundation and the grouting composite foundation. On this basis,a 30-day immersion test was carried out to collect the raw data such as grouting micrographs,bearing capacity and collapsibility. According to the test results,combined with the on-site building,the same materials and test methods were used to correct the tilting and reinforce the building. The results showed that: under the condition that the maximum pressure of primary grouting was 0.3 MPa and the maximum pressure of secondary grouting was 0.6 MPa,the method of split grouting with steel tube with mass ratio 1 ∶ 1 cement slurry and split grouting in two layers showed a good splitting effect. The bearing capacity of the loess foundation strengthened by splitting grouting method was nearly three times higher than that of the original foundation,which greatly improved the engineering properties of the loess. After grouting,more than 67% loess collapsibility could be effectively eliminated. The building underwent uniform settlement and had good stability. In addition,a new settlement calculation method based on pile-soil stress ratio for composite foundation with small pile diameter was proposed.

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罗小博?覮,宋彧,郭启明.西北湿陷性黄土区劈裂注浆试验及地基加固应用[J].湖南大学学报:自然科学版,2021,(9):52~60

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  • 在线发布日期: 2021-09-28
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