黏性土中鉆孔灌注樁自平衡轉(zhuǎn)換系數(shù)取值研究
發(fā)布時(shí)間：2019-06-18 08:11
【摘要】：自平衡檢測(cè)法在樁基檢測(cè)中有效解決了傳統(tǒng)靜載法面臨的許多問題,已得到廣泛地推廣和運(yùn)用,其中自平衡法承載力計(jì)算中轉(zhuǎn)換系數(shù)γ的取值是關(guān)鍵性問題之一。針對(duì)我國(guó)橋梁工程地基土質(zhì)普遍存在黏性土的情況,依托臺(tái)州灣項(xiàng)目工程,對(duì)黏性土中自平衡承載力測(cè)試法中的轉(zhuǎn)換系數(shù)的取值進(jìn)行了原位試驗(yàn)研究。選取3根鉆孔灌注樁,樁徑為1.5 m、樁長(zhǎng)83.5 m,在原樁上先后進(jìn)行自平衡法和堆載法試驗(yàn),在樁身土層交界處布設(shè)鋼筋計(jì)得到相應(yīng)的樁側(cè)摩阻力,將每根樁的上段樁在同一土層處自平衡法測(cè)的極限側(cè)摩阻力值與堆載法測(cè)的極限側(cè)摩阻力值進(jìn)行對(duì)比,得到了各層土自平衡轉(zhuǎn)換系數(shù)值,在該基礎(chǔ)上收集了相似工程2根樁檢測(cè)數(shù)據(jù)進(jìn)行分析,結(jié)果表明在黏性土中鉆孔灌注樁自平衡法與堆載法測(cè)得的上段樁極限摩阻力之比為0.7~0.8。
[Abstract]:The self-equilibrium detection method has effectively solved many problems faced by the traditional static load method in pile foundation detection, and has been widely popularized and applied, among which the value of conversion coefficient gamma in the calculation of bearing capacity of self-balance method is one of the key problems. In view of the widespread existence of clay in the foundation of bridge engineering in China, the value of conversion coefficient in the test method of self-equilibrium bearing capacity in clay is studied by in situ test with the support of Taizhou Bay Project. Three bored cast-in-place piles with diameter of 1.5 m and pile length of 83.5 m were selected. The self-balance method and pile load method were carried out on the original pile one after another. The corresponding pile side friction was obtained by placing steel bar meter at the junction of pile body and soil layer. The ultimate side friction measured by self-balancing method in the upper section of each pile in the same soil layer was compared with the limit side friction measured by heap load method, and the value of soil self-balance conversion coefficient in each layer was obtained. On this basis, the test data of two piles in similar projects are collected and analyzed. The results show that the ratio of maximum friction resistance of bored cast-in-place piles measured by self-balance method and stacking load method in clay is 0.7 鈮，
本文編號(hào)：2501303
[Abstract]:The self-equilibrium detection method has effectively solved many problems faced by the traditional static load method in pile foundation detection, and has been widely popularized and applied, among which the value of conversion coefficient gamma in the calculation of bearing capacity of self-balance method is one of the key problems. In view of the widespread existence of clay in the foundation of bridge engineering in China, the value of conversion coefficient in the test method of self-equilibrium bearing capacity in clay is studied by in situ test with the support of Taizhou Bay Project. Three bored cast-in-place piles with diameter of 1.5 m and pile length of 83.5 m were selected. The self-balance method and pile load method were carried out on the original pile one after another. The corresponding pile side friction was obtained by placing steel bar meter at the junction of pile body and soil layer. The ultimate side friction measured by self-balancing method in the upper section of each pile in the same soil layer was compared with the limit side friction measured by heap load method, and the value of soil self-balance conversion coefficient in each layer was obtained. On this basis, the test data of two piles in similar projects are collected and analyzed. The results show that the ratio of maximum friction resistance of bored cast-in-place piles measured by self-balance method and stacking load method in clay is 0.7 鈮，
本文編號(hào)：2501303
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