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Abstract There are two important properties such as penetration and deformation in geotechnical engineering soil test. In order to effectively obtain the permeability coefficient and settlement of gravelly soil in triggering area of debris flow，a set of integrated test equipment is designed and developed. It is composed of three parts，which are water supply system at constant pressure，a device of generating permeability，and deformation and measuring system. This new device has two advantages，one is measuring the soil settlement deformation under natural state or simulated rainfall conditions，the other is observing the water infiltration process and measuring the permeability coefficient. Then，the new-type device and the traditional instrument are used to do the constant head permeability test respectively. The results show that the permeability coefficient can be calculated approximately by Darcy law. Compared with the traditional one，the new device preserves the grain composition better and weakens the size effect，which makes the measurement more reliable. Experiments show that the new device has high measuring accuracy and good applicability. And then the device is used to the test of gravelly soil in Jiangjia Gully，the results show that both settlement deformation and infiltration depth vary logarithmically with time；and the permeability coefficient and void ratio follows the linear distribution，while power function with the content of soil fine grains. The application indicates that an effective experimental tool is provided by the utility model unit for the research of gravelly soil of debris flow.
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Received: 17 January 2012
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2012, Vol. 31 
