Integrated commissioning and testing is a necessary section of the construction process of China’s high-speed railways, which provides important technical support to ensure the opening and operation. Although the subgrade is a crucial component of the integrated commissioning and testing process for high-speed railways, there has been a lack of systematic analysis regarding the typical problems identified during previous practice. Based on the past testing data of our country’s high-speed railway foundation, this paper systematically summarizes the main typical problems found in integrated commissioning and testing, analyzes the causes behind these problems, and proposes corresponding countermeasures. The objective is to provide guidance for the integrated commissioning and testing of foundations during grading, as well as serve as an important reference for the operation and maintenance of high-speed railway foundations.
Water is an essential factor affecting the use function of the subgrade, and excessive moisture content of the subgrade itself may cause potential diseases such as subgrade bed subsidence and mud pumping. As a dynamic acceptance project of a high-speed railway with a speed of 200 km/h and above in China, the lack of evaluation index of subgrade moisture content not only affects the dynamic acceptance evaluation, but also brings great difficulties to the disposal of abnormal sections of subgrade moisture content. To solve the problem of grading evaluation of moisture content in subgrade bed of railway, based on the previous ground penetrating radar detection of high-speed railway subgrade, the grading evaluation index of moisture content in subgrade bed of high-speed railway is proposed by collecting, processing, evaluating and analyzing the data of water content in subgrade bed, and tracking the occurrence of diseases in abnormal water content section of subgrade, which provides the basis for dynamic acceptance of high-speed railway in China and important guidance for maintaining the abnormal section of the subgrade with moisture content.
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