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Development of a High-Capacity Tensiometer and Its Application

Author: ChenZhongKui
Tutor: ChenRui
School: Harbin Institute of Technology
Course: Civil Engineering
Keywords: Matric suction Tonometer High Range Soil water characteristic curve Slope model Outdoor suction monitoring
CLC: TU415
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 0
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Abstract

Tension meter is a direct measurement of soil matric suction used sensor , the ordinary tension meter measuring less than 100 kPa suction , but only due to its internal water bodies prone to vaporization . Currently , the high range tonometer complex process of saturated and saturated inadequate series such as reaction insensitive , held short , poor stability reasons , its application is limited in scope , and the cost of its use is generally higher especially in the country (territory) . Therefore, the development of the good performance of the low-cost high range tonometer important for unsaturated soil engineering problems . In this study , the use of a the domestic generic type pressure sensor and high intake (5 Bar) clay board developed a low-cost ( materials cost less than 2,000 yuan ) high range tonometer , reduce the high range tonometer on the mainland the use of cost in the region to make up for the domestic the high range tonometer inadequate status quo . Tonometer design as well as the specific saturation process ensures that the tension meter capable of measuring higher than 100 kPa matric suction . Testing the free evaporation test and compaction of soil samples suction measurement test developed high range tonometer performance results show that this tonometer responsive the high suction holders duration , good stability, and reached similar foreign sensor level of performance. Further, the present study found that: when the measured suction intake air value over tension meter clay board , within the shortest possible time , the tension meter immersed gas longer time in the water method can make the performance of the tension measured suction regain recovery. The use of such methods can greatly shorten the tonometer measured suction intake value than clay board again saturated . Tension tested after applying soil water characteristic curve measurement test slope model tests and outdoor suction monitoring . The tension in the soil water characteristic curve measuring test measurement is consistent with the pressure plate instrument curve . Tonometer the outdoor soil maintained suction measurement of about 25 days and no vaporization occurs , experienced a period of changes in the weather factors , such as rainfall and high temperature , the tension meter corresponding suction changes have been measured . The above applications to further expand the the tonometer use of the high range , and accumulated experience .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Test > Test equipment and data
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