港珠澳大橋島隧結合段高壓旋噴樁地基沉降試驗及研究
發(fā)布時間:2019-01-20 08:43
【摘要】:港珠澳大橋島隧結合段管節(jié)下部基礎采用降水堆載預壓+高壓旋噴樁的復合地基形式。常見的原位測試技術不能合理評價地基加固效果,基于半無限空間的布辛涅斯克解,設計了一種采用堆載方式模擬地基應力分布用以分析評價管節(jié)沉降的試驗方法,通過預先埋置的高精度靜力水準系統(tǒng)實測加載過程中的地基沉降,獲得較好試驗數(shù)據(jù)。用分層總和法、考慮變形模量非線性的切線模量法與實測數(shù)據(jù)及數(shù)值計算結果對比分析,結果表明切線模量法與實測值更為接近。試驗表明以堆載方式模擬實際附加壓力進而研究復合地基沉降變形特性的方法直接有效,可作為重要工程地基評價的輔助手段。研究結果對于高壓旋噴樁復合地基的設計計算和現(xiàn)場原位測試具有一定的參考意義。
[Abstract]:The composite foundation of high pressure rotary jet grouting pile with precipitation surcharge preloading is adopted in the bottom foundation of the island tunnel of Hongkong-Zhuhai-Macao Bridge. The common in-situ testing technology can not reasonably evaluate the effect of foundation reinforcement. Based on the Buchinesk solution in semi-infinite space, a test method is designed to simulate the stress distribution of the foundation by means of the surcharge method to analyze and evaluate the settlement of pipe joints. The better test data are obtained through the ground settlement measured in the loading process of the pre-buried static leveling system. The tangent modulus method considering the nonlinear deformation modulus is compared with the measured data and the numerical results. The results show that the tangent modulus method is closer to the measured value. The test results show that the method of simulating the actual additional pressure and studying the settlement and deformation characteristics of composite foundation is direct and effective, and it can be used as an auxiliary method to evaluate the foundation of important engineering. The results are useful for the design and calculation of high pressure rotary jetting pile composite foundation and in situ test.
【作者單位】: 中國礦業(yè)大學深部巖土力學與地下工程國家重點實驗室;中交天津港灣工程研究院;廣東省水利水電科學研究院;
【基金】:國家科技支撐計劃課題(2011BAG07B00) 國家自然科學基金資助項目(51109209,51204168)~~
【分類號】:U456;U459.5
本文編號:2411864
[Abstract]:The composite foundation of high pressure rotary jet grouting pile with precipitation surcharge preloading is adopted in the bottom foundation of the island tunnel of Hongkong-Zhuhai-Macao Bridge. The common in-situ testing technology can not reasonably evaluate the effect of foundation reinforcement. Based on the Buchinesk solution in semi-infinite space, a test method is designed to simulate the stress distribution of the foundation by means of the surcharge method to analyze and evaluate the settlement of pipe joints. The better test data are obtained through the ground settlement measured in the loading process of the pre-buried static leveling system. The tangent modulus method considering the nonlinear deformation modulus is compared with the measured data and the numerical results. The results show that the tangent modulus method is closer to the measured value. The test results show that the method of simulating the actual additional pressure and studying the settlement and deformation characteristics of composite foundation is direct and effective, and it can be used as an auxiliary method to evaluate the foundation of important engineering. The results are useful for the design and calculation of high pressure rotary jetting pile composite foundation and in situ test.
【作者單位】: 中國礦業(yè)大學深部巖土力學與地下工程國家重點實驗室;中交天津港灣工程研究院;廣東省水利水電科學研究院;
【基金】:國家科技支撐計劃課題(2011BAG07B00) 國家自然科學基金資助項目(51109209,51204168)~~
【分類號】:U456;U459.5
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