岩溶路基加筋防塌治理的简化设计方法

吴迪, 李艾文, 李丹, 贾龙, 韦学英, 吴建建. 岩溶路基加筋防塌治理的简化设计方法[J]. 中国岩溶, 2023, 42(3): 538-547. doi: 10.11932/karst2023y001
引用本文: 吴迪, 李艾文, 李丹, 贾龙, 韦学英, 吴建建. 岩溶路基加筋防塌治理的简化设计方法[J]. 中国岩溶, 2023, 42(3): 538-547. doi: 10.11932/karst2023y001
WU Di, LI Aiwen, LI Dan, JIA Long, WEI Xueying, WU Jianjian. Simplified design method of reinforcement treatment for karst subgrade collapse[J]. Carsologica Sinica, 2023, 42(3): 538-547. doi: 10.11932/karst2023y001
Citation: WU Di, LI Aiwen, LI Dan, JIA Long, WEI Xueying, WU Jianjian. Simplified design method of reinforcement treatment for karst subgrade collapse[J]. Carsologica Sinica, 2023, 42(3): 538-547. doi: 10.11932/karst2023y001

岩溶路基加筋防塌治理的简化设计方法

  • 基金项目: 国家自然科学基金项目(No.42067044);广西重点研发计划项目(桂科AB23026028)
详细信息
    作者简介: 吴迪(1982-),男,副教授,博士,主要从事岩土工程方面的科研与教学。E-mail:wudi@guet.edu.cn
    通讯作者: 韦学英(1977-),女,高级工程师,工学学士,主要从事岩土工程灾害治理方面的科研与教学。E-mail:53697424@qq.com
  • 中图分类号: U416

Simplified design method of reinforcement treatment for karst subgrade collapse

More Information
  • 近年来岩溶地区呈高发态势的路面塌陷灾害不断威胁城市交通安全。用回填压实法治理塌陷时,埋入土工织物所形成的加筋垫层,能增强土体稳定性,防止二次塌陷。然而加筋治理方案中筋材的锚固长度分析及受力计算理论相对缺失,现存的加筋体设计方法也较少考虑塌陷发生后加筋治理铺设范围的选择,这些不足严重制约了土工合成材料在岩溶路基塌陷中的工程应用。针对这一现状,提出了一种岩溶路基塌陷后加筋治理的设计方法。该方法采用条分法对筋材上方土拱以下范围的填土进行受力分析,结合筋−土的作用特点,给出了塌陷区和稳定区加筋体拉力的计算公式,进而推导了加筋治理合理锚固长度的计算公式,并梳理了加筋体锚固长度设计流程;在此基础上,基于相关文献的模型试验结果及前人的计算方法对设计方法进行合理性验证,并进一步讨论塌陷宽度、加筋体最大挠度对加筋体拉力和合理锚固长度的影响。结果表明:(1)提出的加筋设计方法计算简洁,所得结果与试验结果更为吻合,由此建立的土工织物加筋垫层治理岩溶区城市路面塌陷的筋材拉力计算理论,对于工程实践具有一定的指导意义;(2)加筋体拉力在塌陷边缘处达到最大,塌陷宽度才是影响加筋体受力和合理锚固长度的主要因素,而加筋体最大挠度对合理锚固长度的影响较小。

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  • 图 1  土工织物防治路面塌陷地质模型分析示意图

    Figure 1. 

    图 2  基本假定示意图

    Figure 2. 

    图 3  条分土块受力分析

    Figure 3. 

    图 4  塌陷区加筋微段受力

    Figure 4. 

    图 5  稳定区加筋体受力情况

    Figure 5. 

    图 6  塌陷宽度对拉力和合理锚固长度的影响

    Figure 6. 

    图 7  加筋体最大挠度对拉力和合理锚固长度的影响

    Figure 7. 

    表 1  结果对比

    Table 1.  Comparison of results

    方法$ {T_H} $/kN·m−1$ T{'_{\max }} $/kN·m−1
    文献[8]的试验结果2.672.57
    本文理论计算1.631.73
    赵洪元计算方法[20]4.965.22
    朱斌计算方法[21]0.52
    Giroud计算方法[30]1.78
    BS8006计算方法[31]1.71
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收稿日期:  2022-01-10
刊出日期:  2023-06-25

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