| ANSYS在土洞演化预警中的应用 |
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| 引用本文： | 覃秀玲,严 明,蒋小珍.ANSYS在土洞演化预警中的应用[J].中国岩溶,2009,28(3):275-280. |
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| 作者姓名： | 覃秀玲 严 明 蒋小珍 |
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| 作者单位： | 1.成都理工大学环境与土木工程学院，中国地质科学院岩溶地质研究所 |
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| 基金项目： | 国土资源部百人计划项目"线性工程岩溶土洞(塌陷)监测预警技术研究"、岩溶所所控项目"岩溶塌陷灾害防治开放实验室建设" |
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| 摘 要： | 以桂林某高速公路为工程依托点，在全面分析现有高速公路覆盖地区的岩溶土洞的监测预警技术的基础上，选取TDR监测技术作为主要研究手段，并用ANSYS模拟了TDR监测全过程。模拟结果表明，在基岩面以上厚5.0 m左右的土层中发育有土洞且直径3.0 m以上时，可能对地面造成破坏，当土层厚度不变（5.0 m），梁的截面尺寸一定（8 cm×6.5 cm），土洞沿基岩面慢慢往上发育时，随着土洞发育直径的不断增大，地面变形也就越明显，且变形趋势呈缓慢的直线型; 当土洞直径为2.0 m，埋深为4.0 m，或土洞直径为4.0 m，埋深为3.0 m时，梁埋深从2.0 m开始，其变形趋于平缓；当土洞直径为3.0 m时，埋深为3.5 m，梁埋深从1.0 m到3.0 m，其变形量基本相当；当土洞直径为5.0 m，土洞顶板埋深为2.5 m，梁埋深分别为1.0 m、2.0 m，其基本保持一致，分别为6.74×10－2 m、6.75×10－2 m，即达到极限平衡状态，说明监测梁布设在距离土洞顶板2 m范围内时，可比较有效地监测到土洞变形破坏的演化趋势。
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| 关 键 词： | 岩溶路基 ANSYS 土洞演化预警 |
| 收稿时间： | 2009/2/27 0:00:00 |
Application of ANSYS to early warning of soil cave evolution |
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| QIN Xiu-ling,YAN Ming and Jiang Xiao-zhen.Application of ANSYS to early warning of soil cave evolution[J].Carsologica Sinica,2009,28(3):275-280. |
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| Authors: | QIN Xiu-ling YAN Ming and Jiang Xiao-zhen |
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| Institution: | 1.College of Environment and Civil Engineering, Chengdu University of Technology，Institute of Karst Geology, CAGS2.College of Environment and Civil Engineering, Chengdu University of Technology3.Institute of Karst Geology, CAGS |
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| Abstract: | This paper took a highway in Guilin as a study case, chose TDR monitoring technology as a major research tools and used ANSYS to simulate the TDR to monitor the entire process, based on the comprehensive analysis on the existing early warning technology of the karst soil cave along highway covered area. The simulation results show that it may cause damage to ground surface if there is soil cave with a diameter of more than 3. 0 m in the earth layer,which is 5.0 m or so away from the bed rock surface. If the layer thickness（5.0 m） and beam cross-section size（8 cm × 6.5 cm） remains unchanged, ground deformation will be more obvious, and the deformation will presents as a slow linear trend, as the soil cave is growing upward slowly along the bed rock surface and its diameter keep on increasing. If the soil cave is 2.0 m long and 4.0 m deep, or it is 4.0 m long and 3.0 m deep, beam deformation tend to stability when it is buried at 2.0 m to 4.0 m depth. If the soil cave is 3.0 m long and 3.5 m deep, beam deformation are almost the same when it is buried at a depth of 1.0-3.0 m. If the soil cave is 5.0 m long and it＇s roof is 2. 5 m deep, beam deformation, which is 6.74 × 10^-2 m and 6. 75 × 10^-2 m respectively, are basically the same when beam buried at 1.0 m and 2.0 m depth,which is also mean that it has reach the limiting equilibration. So it can more effectively monitor the soil deformation and the hole evolution trend that monitoring beams are laid within a depth of 2 m from the roof of soil cave. |
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| Keywords: | ANSYS |
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