| 旋压入土式静力触探机制研究 |
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| 引用本文： | 宋玲,刘奉银,李宁.旋压入土式静力触探机制研究[J].岩土力学,2011,32(Z1):787-0792. |
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| 作者姓名： | 宋玲 刘奉银 李宁 |
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| 作者单位： | 西安理工大学岩土工程研究所;石河子大学水利建筑工程学院 |
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| 基金项目： | 国家自然科学基金项目(No.50879068);国家自然科学基金创新群体项目(No.40821001);中科院寒区旱区与环境研究所冻土工程国家重点实验室资助项目(No.SKLFSE-ZY-03) |
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| 摘 要： | 由于现有静力触探机械设备提供的动力有限,使得静力触探技术无法应用于较硬土层或较深土层中(应力较高)。保证探头顺利平稳地探入较硬土层,是触探技术应用于硬土层的前提条件。通过对旋压式触探时探头上的受力进行分析,推导了不考虑侧壁摩擦力的旋压式触探的总锥尖阻力和扭矩的理论模型,同时也推导了用旋压式触探测试成果计算锥土间摩擦系数的数学模型,并在室内旋压式触探仪上进行相应的试验,试验结果不仅验证了理论分析的正确性,而且试验结果表明:对同一土体制成不同含水率、干重度的试样进行相同的探入速度和旋转速度下的旋压式触探,所得的扭矩与总锥尖阻力呈线性关系。根据数学模型计算的锥土间摩擦系数要比土体的内摩擦系数大得多,但两者具有较明显的一致性。结合土层的各向异性的特点、锥土间的摩阻力的存在等因素分析了旋压式触探方式能够降低总锥尖阻力的原因。
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| 关 键 词： | 岩土工程 工程勘察 触探试验 室内试验 总锥尖阻力 |
| 收稿时间： | 2010-10-30 |
On mechanism of rotary cone penetration test |
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| SONG Ling,LIU Feng-yin,LI Ning.On mechanism of rotary cone penetration test[J].Rock and Soil Mechanics,2011,32(Z1):787-0792. |
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| Authors: | SONG Ling LIU Feng-yin LI Ning |
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| Institution: | 1. Institute of Geotechnical Engineering，Xi’an University of Technology，Xi’an 710048, China; 2. College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China |
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| Abstract: | The cone penetration test(CPT) can’t be used in harder soil such as loess or in deeper soil because of the higher cone resistance and the limited capacity of the equipment of CPT. Cone’s being smoothly pushed into the ground is prerequisite for applying probing technologies in harder or deeper soil. By theoretically analyzing the forces on the cone, the theoretical equations of total cone resistance and torque, excluding wall sided frictional resistance, is established, in which all the influence factors are given. Meantime the mathematic equation to determine the friction coefficient between the soil and the cone is deduced from the theoretical equations of total cone resistance and torque. In addition, the laboratory rotary cone penetration test (RCPT) is carried out. The validity of theoretical analysis is proved. According to the results of RCPT for the samples with different water contents and different dry densities, linear relationship exists between the toque and the total cone resistance on the cone. Although the calculated value of friction coefficient between the soil and the cone based on the results of RCPT is much greater than that of internal friction coefficient of soil, its relevance to the internal friction coefficient of soil appears in some extend. The reason why the lower total resistance acts on the cone when the cone is simultaneously pushed and rotated than that when being only pushed is given by taking account of property along the vertical different from that in the horizon plane of soil and existence of frictional resistance between the cone and soil. |
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| Keywords: | geotechnical engineering engineering exploration penetration test laboratory test total cone resistance |
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