本文選題：破壞包絡面　切入點：多基礎(chǔ)系統(tǒng)　出處：《巖土力學》2016年06期

【摘要】：由多個分離基礎(chǔ)組成的多基礎(chǔ)系統(tǒng)是常用的海洋結(jié)構(gòu)基礎(chǔ)型式�；谄茐陌j面理論,分析了砂土地基多基礎(chǔ)系統(tǒng)的失效模式,建立了相應的承載力計算方法,并驗證了計算方法的可行性。對比分析了單一基礎(chǔ)和多基礎(chǔ)系統(tǒng)不同荷載路徑下的荷載安全系數(shù),探討了破壞包絡面理論與分項系數(shù)法相結(jié)合的基礎(chǔ)承載力計算方法。失效模式的分析表明,由于水平荷載的增大,四腿平臺結(jié)構(gòu)迎浪側(cè)基礎(chǔ)首先到達破壞包絡線,其失效模式屬于滑動失穩(wěn),但由于基礎(chǔ)間的運動約束,其并不會出現(xiàn)真正的滑移破壞。隨著水平荷載進一步地增大,迎浪側(cè)基礎(chǔ)承擔的水平和豎向荷載不斷減小,導致背浪側(cè)基礎(chǔ)受到不斷增大的荷載。最終,背浪側(cè)基礎(chǔ)也到達破壞包絡線,多基礎(chǔ)系統(tǒng)失效。分析表明,荷載路徑對基礎(chǔ)的荷載安全系數(shù)有決定性的影響,計算基礎(chǔ)的荷載安全系數(shù)需指明相應的荷載路徑。鑒于破壞包絡面的大小和形狀取決于眾多因素,基礎(chǔ)設(shè)計時需采用特定工況下的破壞包絡面進行承載力計算。
[Abstract]:Based on the theory of failure envelope surface, the failure mode of multi-foundation system of sand foundation is analyzed, and the corresponding calculation method of bearing capacity is established. The feasibility of the calculation method is verified, and the load safety factors of single foundation system and multi-foundation system under different load paths are compared and analyzed. The calculation method of foundation bearing capacity based on failure envelope theory and sub-factor method is discussed. The failure mode analysis shows that the foundation of four-legged platform structure first reaches the damage envelope due to the increase of horizontal load. The failure mode belongs to sliding instability, but due to the movement constraint between foundations, there is no real slip failure. As the horizontal load increases further, the horizontal and vertical loads of the foundation on the wave side decrease continuously. The analysis shows that the load path has a decisive effect on the load safety factor of the foundation. In order to calculate the load safety factor of the foundation, the load path should be pointed out. In view of the fact that the size and shape of the failure envelope depends on many factors, the bearing capacity of the foundation should be calculated by using the failure envelope under specific conditions.
【作者單位】： 天津大學水利工程仿真與安全國家重點實驗室;中交天津港灣工程研究院有限公司;交通運輸部規(guī)劃研究院;
【分類號】：P75;TU475
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本文編號：1669342