本文選題：地表變形 + 地基基礎(chǔ)�。� 參考：《河南理工大學(xué)》2014年碩士論文

【摘要】：地下開采引起的地表變形改變了地基基礎(chǔ)的初始接觸狀態(tài),給上部建筑物的安全造成威脅。利用地基增濕具有的改善變形特性,使局部地基軟化,改善地基基礎(chǔ)的接觸狀態(tài),可以達(dá)到保護(hù)上部建筑物的目的。自行設(shè)計(jì)制作了多功能采動(dòng)變形相似模擬試驗(yàn)臺(tái),具有模擬地表曲率變形和壓縮變形、實(shí)現(xiàn)局部地基注水增濕、重復(fù)采動(dòng)下巖層移動(dòng)、不同傾角煤層開采等功能。利用多功能試驗(yàn)臺(tái)完成了地表不同曲率變形的模擬試驗(yàn),獲得了變形過程中地基反力變化規(guī)律。結(jié)果表明:隨著地表曲率變形的增大,地基反力的畸變?cè)絿?yán)重。當(dāng)正曲率變形為0.7mm/m2時(shí),局部地基反力從初始狀態(tài)的0.01Mpa增大到0.07Mpa;當(dāng)負(fù)曲率變形為0.7mm/m2時(shí),局部地基反力從0.02Mpa增大到0.11Mpa。地表發(fā)生曲率變形后產(chǎn)生的不均勻地基反力會(huì)嚴(yán)重影響上部結(jié)構(gòu)的安全。在地表曲率變形的基礎(chǔ)上,完成了局部地基注水增濕試驗(yàn),獲得了增濕過程中的地基反力變化規(guī)律。結(jié)果表明:隨著注水量的增多,畸變的地基反力得到較大的改善。當(dāng)正曲率變形為0.7mm/m2時(shí),在地基中部注水7.5758L后,局部最大的地基反力從0.07Mpa減小到0.01Mpa;當(dāng)負(fù)曲率變形為0.7mm/m2時(shí),在基礎(chǔ)兩端部注水11.558L后,局部最大的地基反力從0.11Mpa減小到0.04Mpa。地表發(fā)生曲率變形時(shí),在地基的承載區(qū)注水,可以改善地基與基礎(chǔ)的接觸狀態(tài),能夠降低不均勻的地基反力,提高建筑物的安全系數(shù)。增濕過程中墻體的最大沉降量為21.4mm,不會(huì)引起地基的坍塌和失穩(wěn),增濕后土體含水率的最大差異為6.29%,局部土體的孔隙比下降,地基的承載力得到提高,表明采用局部增濕軟化地基改善地表變形引起的不均勻地基反力是可行的�；诙橘|(zhì)模型,建立了增濕地基的平均應(yīng)力應(yīng)變與注水量的關(guān)系,運(yùn)用計(jì)算地基沉降的分層總和法原理,推導(dǎo)出增濕后地基沉降的預(yù)估公式,并對(duì)沉降量的理論值和實(shí)測(cè)值進(jìn)行了分析。
[Abstract]:The ground deformation caused by underground mining changes the initial contact state of the foundation and threatens the safety of the upper building.The purpose of protecting the upper building can be achieved by using the humidification of the foundation to improve the deformation characteristic, to soften the local foundation and to improve the contact state of the foundation.A multifunctional similar test rig for mining deformation was designed and made, which can simulate surface curvature deformation and compression deformation, realize water injection and humidification of local foundation, rock stratum movement under repeated mining, and mining coal seam with different dip angle, etc.The simulation test of different curvature deformation of the ground surface was completed by using a multifunctional test bed, and the variation law of the foundation reaction force during the deformation process was obtained.The results show that with the increase of surface curvature deformation, the distortion of foundation reaction becomes more serious.When the positive curvature deformation is 0.7mm/m2, the local foundation reaction force increases from 0.01Mpa to 0.07Mpa.When the negative curvature is 0.7mm/m2, the local subgrade reaction force increases from 0.02Mpa to 0.11Mpa.The safety of superstructure will be seriously affected by the non-uniform foundation reaction after the curvature deformation of the surface.On the basis of the surface curvature deformation, the local foundation water injection humidification test was completed, and the variation law of the foundation reaction force during the humidification process was obtained.The results show that with the increase of water injection, the reaction force of the distorted foundation is greatly improved.When the positive curvature deformation is 0.7mm/m2, the local maximum ground reaction force decreases from 0.07Mpa to 0.01MPA after 7.5758L injection in the middle of the foundation, and when the negative curvature deformation is 0.7mm/m2, the local maximum ground reaction force decreases from 0.11Mpa to 0.04Mpa. when the water injection is 11.558L at both ends of the foundation.When curvature deformation occurs on the ground, water injection in the bearing area of the foundation can improve the contact state between the foundation and the foundation, reduce the non-uniform foundation reaction force, and increase the safety factor of the building.In the process of humidification, the maximum settlement of the wall is 21.4mm, which will not cause the collapse and instability of the foundation. The maximum difference of soil moisture content after humidification is 6.29, the void ratio of the local soil decreases, and the bearing capacity of the foundation is improved.It shows that it is feasible to use local humidifying and softening foundation to improve the reaction force of uneven ground caused by surface deformation.Based on the binary medium model, the relationship between the average stress and strain of the humidified foundation and the quantity of water injection is established. By using the principle of stratified summation method to calculate the settlement of the foundation, the prediction formula of the foundation settlement after the humidification is derived.The theoretical and measured values of settlement are analyzed.
【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TD325;TU470

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