深層土體側(cè)向載荷試驗(yàn)探頭的研制與應(yīng)用
[Abstract]:In geotechnical engineering design, the static lateral pressure coefficient, horizontal bed coefficient, undrained shear strength and bearing capacity of deep soil are very important design parameters. The influence of transportation and indoor test on the original stress state of the soil makes the measured parameters can not reflect the real state of the field soil. Therefore, it is the direction of geotechnical engineers to seek a simple in situ testing technique to estimate the above parameters. However, many experiences have been accumulated in the flat-shovel dilatation test, pressure-pressure test and stress shovel test, which are based on lateral loading mechanism, but there are still some limitations in application. It is necessary to improve and develop the existing test instruments to meet the needs of practical engineering. For this reason, on the basis of the hole pressure displacement flat shovel probe developed by ourselves, a lateral load test probe for deep soil was developed, and the initial application of the test results was realized through field test. The main research contents and results are as follows: (1) under the condition of not changing the specifications of the traditional flat shovel probe, the traditional flexible diaphragm is replaced by the micro rigid load plate, and the seal and the reset of the load plate are realized by using the elastic rubber film. The maximum lateral displacement of the rigid load plate can reach 3 mm, which makes the relative displacement s / b reach 0.05, and the complete p-s curve can be measured theoretically. Install micro displacement sensor for continuous measurement of load plate displacement. Installation of pore pressure and soil pressure elements for measuring soil pressure at test depth, pore water pressure and pore pressure dissipation test. This paper briefly introduces the equipment and principle of lateral load test of deep soil. (2) the lateral load test and flat dilatation test of deep soil are carried out at Lianyungang seaside high compression soft soil site and Nanjing Hongqiao floodplain silt site. The experimental data are processed and preliminarily analyzed by contrast tests such as cross plate shear test. The results show that the lateral load test of deep soil can accomplish the traditional flat shovel test target, and directly measure the static earth pressure in situ at the depth of the test. The true and complete p-s curve, the excess pore water pressure and its dissipation process, the experimental data are more comprehensive and directly reflect the engineering properties of the tested soil. (3) according to the experimental data, the accurate division of soil layer is discussed. The method of estimating parameters such as horizontal consolidation coefficient, static lateral pressure coefficient, horizontal bed coefficient and bearing capacity characteristic value of deep soil is simple and effective. To meet the needs of engineering practice.
【學(xué)位授予單位】:南京工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU415
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