Bearing behavior experiment of large diameter rock - socketed cast - in - place piles 大直徑嵌巖灌注樁承載力的試驗研究
Piles set into rock 深基礎(chǔ)嵌巖灌注樁
Main characteristics of bearing capacity of cast - in - place pile under vertical load have been expounded by introduction to engineering course and analysis of experiment result . and application of test pile in concrete design has been probed 摘要通過對工程試樁過程介紹及對結(jié)果的分析,總結(jié)了豎向荷載作用下嵌巖灌注樁承載力的主要特點(diǎn),并對試樁在具體設(shè)計中的應(yīng)用進(jìn)行了探討。
And the clear and complete calculation methods of the piles in soft - rock in the standards have not yet been found . on the basis of testing study on bearing properties of bored pile in xigeda - mudstone in xichang - panzhihua expressway project , this paper works in three aspects 對以該泥巖層為持力層的嵌巖灌注樁基礎(chǔ)未見專門研究文獻(xiàn),現(xiàn)行各規(guī)范對極軟巖中的樁基亦沒有明確完整的計算方法。
By the check - out , inspection and measurement to start construction the industrial art to this test pile with the examination between stake body mass and bearing power , made sure the stroke reasonable operation method drilling under the dissolved cavern geology term ; the pier foundation loading test expressed the lading and rub the lading that resistance drag a glazing for of relation , and to the borehole cast - in - place concrete pile in the karst terrain deliver with break the mechanism , the characteristic of bearing power , proceeding the spot test job of the full of result ; the test data expresses the stake side friction resistance to rises with a bat batch terminal friction resistance very important function , the of tip of pile resistance drag occupies the proportion very few 通過對本次試樁施工工藝的檢測和樁身質(zhì)量及承載力的檢驗,確定了沖擊鉆在溶洞地質(zhì)條件下的合理使用方法;基樁承載實驗表明了荷載與摩擦阻力之間的關(guān)系,并對巖溶地區(qū)的嵌巖灌注樁的荷載傳遞和破壞機(jī)理、承載力特性,進(jìn)行了富有成果的現(xiàn)場測試工作;試驗數(shù)據(jù)表明樁側(cè)摩阻和支盤端阻起很重要的作用,樁端阻力所占比例甚少。這與設(shè)計樁基時的計算模式相差很大,承載力也較設(shè)計增加;使用力學(xué)數(shù)值分析方法和有限單元法,對鉆孔灌注樁樁端下的巖體強(qiáng)度和結(jié)構(gòu)穩(wěn)定性方面進(jìn)行模擬計算和定量研究。