| 原状冻土非线性断裂韧度测试与修正 |
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| 引用本文： | 刘晓洲,王德刚,李洪升,叶辉.原状冻土非线性断裂韧度测试与修正[J].岩土力学,2007,28(8):1533-1538. |
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| 作者姓名： | 刘晓洲 王德刚 李洪升 叶辉 |
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| 作者单位： | 1. 大连大学，大连 116622; 2. 大连理工大学 工程力学系，大连 116023；3. 大连普兰店市水利局，大连 116200 |
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| 摘 要： | 在以往原状冻土现场试验方法的基础上，针对原状冻土的非线性断裂力学特性进行了Ⅰ型和Ⅱ型断裂力学试验。在不同深度的冻胀量、冻深与时间变化规律下严格控制试样制作及试验时的温度，利用动态数据采集系统测出试样加力点处位移与力的关系曲线，并计算出相应的非线性参数。提出了利用非线性修正因子计算原状冻土断裂韧度的方法，并算出Ⅰ型、Ⅱ型直裂纹加卸载试样的非线性断裂韧度，将其与岩石断裂力学中的塑性修正因子方法的计算结果进行了对比，二者基本一致，说明该方法可以用来计算、修正原状冻土非线性断裂韧度，从而为冻土非线性理论的研究拓宽了思路。
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| 关 键 词： | 原状冻土 现场试验 非线性断裂韧度 修正因子 |
| 文章编号： | 1000-7598-（2007）08-1533-06 |
| 收稿时间： | 2005-08-30 |
| 修稿时间： | 2005-08-30 |
Research on test and revision of nonlinear fracture toughness of undisturbed frozen soils |
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| LIU Xiao-zhou,WANG De-gang,LI Hong-sheng,YE Hui.Research on test and revision of nonlinear fracture toughness of undisturbed frozen soils[J].Rock and Soil Mechanics,2007,28(8):1533-1538. |
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| Authors: | LIU Xiao-zhou WANG De-gang LI Hong-sheng YE Hui |
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| Institution: | 1.Dalian University, Dalian 116622, China; 2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China; 3. Dalian Pulandian Water Resources Bureau 116200, China |
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| Abstract: | To study the nonlinear fracture mechanical characters of undisturbed frozen soils, the fracture TestⅠand TestⅡ based on the method of undisturbed frozen soils’ field test before have been done. According to the variational rules of heave quantities, the frozen depths and time at different depths, the temperatures were controlled strictly when the specimens were being made and tested. Then the relationship between the specimen displacement of force point and the force has been measured by using the dynamic data acquisition system; and the corresponding nonlinear parameters have been calculated. A new method, which can use nonlinear revision factor to predict fracture toughness of undisturbed frozen soils, has been proposed. Moreover, using present method, nonlinear fracture toughness of TestⅠ and Test Ⅱstraight crack loading and unloading specimens has been also computed. Numerical comparison shows that present results agree well with those computed from rock fracture mechanics. Therefore, this new method could be used to test and revise nonlinear fracture toughness of undisturbed frozen soils. |
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| Keywords: | undisturbed frozen soils field test nonlinear fracture toughness revision factor |
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