橋頭跳車搭板在線抬升研究
發(fā)布時間：2018-11-10 14:38
【摘要】：我國改革開放之后，公路建設方面得到了快速的進步，尤其是“八五”計劃之后，得到了突飛猛進的發(fā)展，公路里程增長迅速，相關領域的技術也不斷更新。隨著經(jīng)濟的穩(wěn)中有進，社會事業(yè)的全面進步，交通運輸行業(yè)和交通發(fā)展改革邁出新的步伐，但是公路交通運輸仍是我國的主要運輸方式，高速公路在為我國經(jīng)濟發(fā)展仍發(fā)揮著極其重要的作用。然而，從已交付使用的高等級公路來看，橋頭跳車現(xiàn)象非常普遍，己成為改善和提高我國高速公路建設質量的“攔路虎”，也是擺在我們面前的一大技術難題。 橋頭跳車的危害包括減慢行車速度、影響行車安全、影響車輛運營和增加公路養(yǎng)護費用等。它已成為道路的重要安全隱患之一，因此找到經(jīng)濟有效的防治橋頭跳車問題的措施，，提高我國高等公路行車中的安全、舒適和快速等方面的性能，以及增加我國高等級道路的使用年限，對今后我國的道路發(fā)展和經(jīng)濟發(fā)展都具有及其深遠的意義。 為了解決橋頭跳車問題，減少其地基沉降以及引道自身壓縮沉降之外，比較常見的方法是采用橋頭搭板防治跳車現(xiàn)象。當前橋頭跳車處治措施主要的缺點：被動處治為主、缺乏精確度、影響車輛通行。由于缺乏足夠的精度，使得后期治理措施極為繁瑣且嚴重影響車輛通行。 本文介紹的注漿方法為粗調、精調兩級抬升控制過程；深層注漿加固，淺層注漿抬升，板層螺桿精度抬升注漿填充的三層注漿方式。各級調節(jié)、各層注漿相互配合，最終主動完成精確補償。淺層注漿和深層注漿在整體設計過程中預埋管件，深厚軟基處理中的碎石注漿樁改進為墩帽式碎石注漿樁，對地基進一步加固的同時提高地基的承載力和減小沉降。該注漿方法能針對沉降路段不良變形及時有效補償，把病態(tài)消除在萌芽狀態(tài)，耗時短，操作方便可行，基本是在線抬升，不影響車輛通行。 采用ANSYS程序，通過有限元方法分析橋頭過渡段軟弱地基首先對深厚軟基墩帽式碎石注漿樁注漿加固，然后對板底注漿孔初始抬升，最后對板層螺桿注漿填充已達到精度抬升全過程。具體內容包括橋頭搭板、墩式碎石注漿樁等組成的復合路基的樁土沉降特性、注漿量，抬升力，抬升值，注漿臨界深度。 通過ANSYSY建模研究，發(fā)現(xiàn)在軟土路基加固前，應力主要是在二灰穩(wěn)定砂礫基層、砂礫墊層及加固區(qū)消散，造成該區(qū)域土體固結壓縮變形，在經(jīng)過深層注漿加固后，最大應力主要是二灰穩(wěn)定砂礫基層消散，待沉降逐漸穩(wěn)定后，進行淺層加固注漿把沉降量控制在一定范圍內，以上是粗略調節(jié)部分；再通過錨桿精確調節(jié)抬升橋頭搭板，少量淺層注漿后，恢復沉降變形。因此，把粗調和精調組合使用最終完美的控制了路基的工后沉降，將橋頭搭板最終精確完成在線抬升。
[Abstract]:After China's reform and opening up, highway construction has made rapid progress, especially after the "eighth Five-Year Plan", which has been developed by leaps and bounds, the highway mileage has increased rapidly, and the technology in related fields has been constantly updated. With the steady progress of the economy and the overall progress of social undertakings, new steps have been taken in the reform of the transportation industry and traffic development, but road transportation is still the main mode of transportation in China. Expressway is still playing an extremely important role in the economic development of our country. However, from the point of view of the high-grade highway that has been put into use, the phenomenon of jumping at the bridgehead is very common, which has become an obstacle to improving and improving the quality of highway construction in our country, and is also a big technical problem in front of us. The harm of bridgehead jumping includes slowing down the driving speed, affecting the driving safety, affecting the vehicle operation and increasing the cost of highway maintenance and so on. It has become one of the most important hidden dangers of road safety. Therefore, we should find economic and effective measures to prevent and cure the problem of bridge-head jumping, and improve the safety, comfort and speed of our country's higher highway driving, such as safety, comfort and speed, etc. Increasing the service life of our country's high grade roads is of great significance to our country's road development and economic development in the future. In order to solve the problem of bridgehead jumping and to reduce the settlement of foundation and the compression settlement of approach road, the common method is to use bridgehead slab to prevent the phenomenon of jumping. At present, the main shortcomings of the bridge head jumping treatment measures are passive treatment, lack of accuracy, affecting vehicle traffic. Due to the lack of sufficient precision, the later management measures are extremely cumbersome and seriously affect vehicle traffic. The grouting method introduced in this paper is a three-layer grouting method, which includes coarse adjustment, fine adjustment, two-stage uplift control process, deep grouting reinforcement, shallow grouting uplift, plate screw precision uplift and grouting filling. All levels of regulation, each layer of grouting with each other, the final initiative to complete accurate compensation. In the whole design process of shallow grouting and deep grouting, the pipe fittings are preburied, and the gravel grouting pile in the treatment of deep soft foundation is improved into a cap stone grouting pile, which can further strengthen the foundation and increase the bearing capacity and reduce the settlement of the foundation at the same time. The grouting method can compensate the bad deformation in time and effectively, eliminate the morbid state in the budding state, take a short time, operate conveniently and feasible, basically lift on line, and do not affect the traffic of the vehicle. By using ANSYS program, the soft foundation in the transition section of bridge head is analyzed by finite element method. Firstly, the cap type gravel grouting pile with deep soft foundation pier is strengthened with grouting, and then the initial uplift of grouting hole at the bottom of the slab is carried out. Finally, the whole process of plate screw grouting filling has been achieved. The concrete contents include the pile-soil settlement characteristics, grouting quantity, uplift force, lifting value, critical depth of grouting of composite subgrade composed of bridgehead slab, pier-type gravel grouting pile and so on. Through ANSYSY modeling research, it is found that before the soft soil subgrade is strengthened, the stress is mainly in the boulder base, the gravel cushion and the reinforcement area dissipate, resulting in the consolidation and compression deformation of the soil in this area, and after the deep grouting, the stress is strengthened. The maximum stress is mainly dissipated at the base of lime-fly ash stabilized sand and gravel. After the settlement is gradually stabilized, the settlement is controlled within a certain range by shallow reinforcement and grouting, and the above is the rough adjustment part. Then, the lifting bridge head slab is accurately adjusted by the anchor rod, and a small amount of shallow grouting is used to recover the settlement deformation. Therefore, the combination of coarse and fine adjustment controls the post-construction settlement of the subgrade perfectly, and finally completes the on-line uplift of the bridgehead slab.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.71
本文編號：2322738
[Abstract]:After China's reform and opening up, highway construction has made rapid progress, especially after the "eighth Five-Year Plan", which has been developed by leaps and bounds, the highway mileage has increased rapidly, and the technology in related fields has been constantly updated. With the steady progress of the economy and the overall progress of social undertakings, new steps have been taken in the reform of the transportation industry and traffic development, but road transportation is still the main mode of transportation in China. Expressway is still playing an extremely important role in the economic development of our country. However, from the point of view of the high-grade highway that has been put into use, the phenomenon of jumping at the bridgehead is very common, which has become an obstacle to improving and improving the quality of highway construction in our country, and is also a big technical problem in front of us. The harm of bridgehead jumping includes slowing down the driving speed, affecting the driving safety, affecting the vehicle operation and increasing the cost of highway maintenance and so on. It has become one of the most important hidden dangers of road safety. Therefore, we should find economic and effective measures to prevent and cure the problem of bridge-head jumping, and improve the safety, comfort and speed of our country's higher highway driving, such as safety, comfort and speed, etc. Increasing the service life of our country's high grade roads is of great significance to our country's road development and economic development in the future. In order to solve the problem of bridgehead jumping and to reduce the settlement of foundation and the compression settlement of approach road, the common method is to use bridgehead slab to prevent the phenomenon of jumping. At present, the main shortcomings of the bridge head jumping treatment measures are passive treatment, lack of accuracy, affecting vehicle traffic. Due to the lack of sufficient precision, the later management measures are extremely cumbersome and seriously affect vehicle traffic. The grouting method introduced in this paper is a three-layer grouting method, which includes coarse adjustment, fine adjustment, two-stage uplift control process, deep grouting reinforcement, shallow grouting uplift, plate screw precision uplift and grouting filling. All levels of regulation, each layer of grouting with each other, the final initiative to complete accurate compensation. In the whole design process of shallow grouting and deep grouting, the pipe fittings are preburied, and the gravel grouting pile in the treatment of deep soft foundation is improved into a cap stone grouting pile, which can further strengthen the foundation and increase the bearing capacity and reduce the settlement of the foundation at the same time. The grouting method can compensate the bad deformation in time and effectively, eliminate the morbid state in the budding state, take a short time, operate conveniently and feasible, basically lift on line, and do not affect the traffic of the vehicle. By using ANSYS program, the soft foundation in the transition section of bridge head is analyzed by finite element method. Firstly, the cap type gravel grouting pile with deep soft foundation pier is strengthened with grouting, and then the initial uplift of grouting hole at the bottom of the slab is carried out. Finally, the whole process of plate screw grouting filling has been achieved. The concrete contents include the pile-soil settlement characteristics, grouting quantity, uplift force, lifting value, critical depth of grouting of composite subgrade composed of bridgehead slab, pier-type gravel grouting pile and so on. Through ANSYSY modeling research, it is found that before the soft soil subgrade is strengthened, the stress is mainly in the boulder base, the gravel cushion and the reinforcement area dissipate, resulting in the consolidation and compression deformation of the soil in this area, and after the deep grouting, the stress is strengthened. The maximum stress is mainly dissipated at the base of lime-fly ash stabilized sand and gravel. After the settlement is gradually stabilized, the settlement is controlled within a certain range by shallow reinforcement and grouting, and the above is the rough adjustment part. Then, the lifting bridge head slab is accurately adjusted by the anchor rod, and a small amount of shallow grouting is used to recover the settlement deformation. Therefore, the combination of coarse and fine adjustment controls the post-construction settlement of the subgrade perfectly, and finally completes the on-line uplift of the bridgehead slab.
【學位授予單位】：武漢理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.71
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