With the construction boost of China marine projects, it is necessary to perform underwater foundation monitoring. This paper describes the modification of two types of vibrating wire instruments to achieve the automatic measurement of surface settlement of underwater foundation. Thus surface settlement of underwater foundation can be monitored by automatic data acquisition, storage and transmission with help of current sophisticated automatic data acquisition, automatic storage and battery systems. The automatic monitoring system can provide real-time and reliable monitoring data to guide the marine construction.
It is found that great differences exist in the consolidated quick direct shear strength index of the silty clay based on several consolidated quick direct shear tests with different rate of shear. In this letter, the changes of the water-content coefficients of the soil samples before and after the tests are analyzed. The results indicate that the drain consolidation phenomenon exists during the consolidated quick direct shear tests. Different rates of shear are corresponding to different levels of drain consolidation, and then the strength index is different. Furthermore, the reason of the fact that the friction angle of the silty clay relatively increases with different rates of shear, while the cohesive strength decreases relatively is explained.
By taking practical engineering cases as an example, this article judges the safety distance affected by ultrahigh energy dynamic compaction. Through the organization and analysis of the data of several ultrahigh energy dynamic compaction projects, the opinion that the judgment method of vibration acceleration exists flaws is proposed. Considering the possible influence of dynamic compaction vibration on person and other non-buildings, it suggests to use the method of vibration velocity to judge affected safety distance.
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