本文選題：靜壓樁 + 模型試驗(yàn)�。� 參考：《河南工業(yè)大學(xué)》2017年碩士論文

【摘要】：近年來我國不斷提高環(huán)境污染治理力度,同時(shí)大力提倡預(yù)制構(gòu)件應(yīng)用于工程建設(shè)領(lǐng)域以減少建設(shè)施工對(duì)環(huán)境的污染。靜壓樁以其環(huán)境污染小,無噪音振動(dòng)污染,預(yù)制型樁體質(zhì)量易于控制以及施工速度較快等優(yōu)點(diǎn),在基礎(chǔ)工程中越來越受到設(shè)計(jì)人員的關(guān)注。本文簡(jiǎn)要地闡述了靜壓樁的發(fā)展歷程及其常用的研究方式,通過模型試驗(yàn)對(duì)非飽和砂土中的靜壓?jiǎn)螛杜c靜壓群樁(雙樁)承載力特性和雙樁壓入過程中樁與樁之間相互作用進(jìn)行研究。本文主要研究內(nèi)容如下:(1)采用多功能模型樁進(jìn)行標(biāo)定試驗(yàn)運(yùn)用自主研制的落雨布砂裝置成功在標(biāo)定罐內(nèi)制備了相對(duì)密度均勻的砂層用于開展標(biāo)定試驗(yàn)。利用標(biāo)定罐采用氣標(biāo)和砂標(biāo)結(jié)合的方式有效避免了膜式土壓力盒在標(biāo)定時(shí)出現(xiàn)的卸載響應(yīng)顯著滯后現(xiàn)象,得到了在滿足試驗(yàn)精度要求的前提下,盡可能采用大量程的土壓力盒是減少“土拱效應(yīng)”最有效的方式之一,同時(shí)取到了較為線性的標(biāo)定結(jié)果,為進(jìn)一步在壓樁過程中對(duì)樁體受力特性研究做好了準(zhǔn)備。(2)采用多功能模型樁開展單樁壓入試驗(yàn)使用現(xiàn)有的靜力壓樁系統(tǒng)裝置,對(duì)相同的兩根模型試驗(yàn)樁開展單樁壓入試驗(yàn)。研究壓入過程中模型樁體受力情況,壓入深度與承載力、壓樁力、樁端阻力和樁側(cè)摩阻力之間的關(guān)系。由試驗(yàn)結(jié)果可知,在壓樁深度為12D范圍內(nèi),隨著樁體壓入深度的增加,壓樁力、樁端阻力、樁側(cè)摩阻力以及樁體承載力均呈現(xiàn)出非線性增加;并且隨著壓入深度的增加,樁端阻力所占?jí)簶读Φ谋戎刂饾u減小;與之相反,隨著壓入深度的增加,樁側(cè)摩阻力所占?jí)簶读Φ谋戎刂饾u增大。(3)研究靜壓群樁(雙樁)承載力特性采用不同的樁間距開展雙樁壓入試驗(yàn),研究樁間距和壓樁深度與承載力、壓樁力、樁端阻力以及樁側(cè)摩阻力之間的關(guān)系。由試驗(yàn)結(jié)果可知,隨樁間距的增加,雙樁系統(tǒng)承載力逐漸增大,并逐漸趨近于兩倍單樁承載力;后樁壓入過程中的壓樁力、樁端阻力和樁側(cè)摩阻力逐漸減小,同時(shí)逐漸趨近于單樁壓入狀態(tài);先壓入樁體受到的土壓力逐漸減小,并隨后壓樁壓入深度的增加而增大。隨著后壓樁壓入深度的增加,其壓樁力、樁端阻力和樁側(cè)摩阻力均呈非線性增加。(4)研究靜壓雙樁系統(tǒng)中的樁與樁之間相互作用通過對(duì)后壓入樁體引起的先壓入樁體的位移量進(jìn)行分析可知,隨著樁間距的增加,先壓入樁體的位移量逐漸減小;隨著壓入深度的增加先壓入樁體的位移量逐漸增大。說明樁間距越小或壓樁深度越深,其產(chǎn)生“土拱效應(yīng)”對(duì)樁體穩(wěn)定性的影響越明顯。從而說明了,樁體壓入過程中產(chǎn)生新的土體應(yīng)力場(chǎng)影響范圍隨壓入深度的增加而變大。
[Abstract]:In recent years, our country has continuously improved the environmental pollution control, and strongly advocated the application of prefabricated components in the field of engineering construction in order to reduce the environmental pollution caused by construction. Static pressure pile has been paid more and more attention in foundation engineering because of its advantages such as less environmental pollution, no noise vibration pollution, easy quality control of prefabricated pile body and faster construction speed. In this paper, the development of static pressure pile and its common research methods are briefly described. The bearing capacity characteristics of static pressure single pile and static pressure group pile (double pile) and the interaction between pile and pile in the process of compression of two piles in unsaturated sandy soil were studied by model test. The main contents of this paper are as follows: (1) the calibration test is carried out by using multi-function model pile. In the calibration tank, the sand layer with uniform relative density has been successfully prepared by using the self-developed rain cloth sand device to carry out the calibration test. By using the combination of gas and sand in the calibration tank, the obvious lag phenomenon of the unloading response of the membrane earth pressure box during calibration is effectively avoided, and the premise of satisfying the requirement of test precision is obtained. One of the most effective ways to reduce the "soil arch effect" is to use a large number of earth pressure boxes as much as possible, and at the same time, the calibration results are obtained. In order to further study the bearing characteristics of pile body in the process of pile-pressing, the multi-function model pile is adopted to carry out the single pile indentation test. The existing static pile-pressing system is used to carry out the single pile-indentation test for the same two model test piles. In this paper, the relationship between the bearing capacity, pile pressure, pile tip resistance and pile side friction is studied. According to the test results, in the range of 12D, with the increase of the depth of the pile, the pressure of the pile, the resistance at the end of the pile, the friction of the side of the pile and the bearing capacity of the pile show a nonlinear increase, and with the increase of the depth of the pile, The proportion of resistance at the end of the pile to the force of the pile decreases gradually; on the contrary, with the increase of the depth of the pile, Study on bearing capacity characteristics of static pressure Group pile (double pile) by using different pile spacing to carry out double-pile indentation test, study pile spacing, pile depth and bearing capacity, pressure pile force, The relationship between pile end resistance and pile side friction. According to the test results, with the increase of pile spacing, the bearing capacity of double pile system increases gradually and approaches to double bearing capacity of single pile, and the pile pressure force, pile tip resistance and pile side friction decrease gradually in the process of post-pile pressing. At the same time, the soil pressure of the first pile decreases gradually, and then increases with the increase of the pressing depth of the pile. With the increase of the indentation depth of the post-pressure pile, the pile-pressing force, The study on the interaction between pile and pile in static pressure double pile system by analyzing the displacement of the pre-pressured pile caused by post-pressing pile, we can know that with the increase of pile spacing, The displacement of the first pressure pile body decreases gradually, and the displacement of the first pressure pile body increases with the increase of the indentation depth. It shows that the smaller the pile spacing or the deeper the pile-pressing depth, the more obvious the influence of "soil arch effect" on pile stability. The result shows that the influence range of the new soil stress field in the process of pile pressing becomes larger with the increase of indentation depth.
【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU473.1

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