JPH11152984A - Pressure meter test method utilizing hollow cylindrical test body with hole bottom - Google Patents

Pressure meter test method utilizing hollow cylindrical test body with hole bottom

Info

Publication number
JPH11152984A
JPH11152984A JP9318696A JP31869697A JPH11152984A JP H11152984 A JPH11152984 A JP H11152984A JP 9318696 A JP9318696 A JP 9318696A JP 31869697 A JP31869697 A JP 31869697A JP H11152984 A JPH11152984 A JP H11152984A
Authority
JP
Japan
Prior art keywords
hollow cylindrical
pressure
test body
hole
cylindrical test
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9318696A
Other languages
Japanese (ja)
Inventor
Kazuo Tani
和夫 谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central Research Institute of Electric Power Industry
Original Assignee
Central Research Institute of Electric Power Industry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Central Research Institute of Electric Power Industry filed Critical Central Research Institute of Electric Power Industry
Priority to JP9318696A priority Critical patent/JPH11152984A/en
Publication of JPH11152984A publication Critical patent/JPH11152984A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To precisely evaluate the deformation property of ground at an original position under arbitrary stress. SOLUTION: A boring hole 2 is drilled in ground 1 being an object to be investigated, a hollow cylindrical test body 3 is cut out from the ground 1 of the hole bottom of the boring hole 2, outer pressure Pout and inner pressure Pin for the radial direction are applied on the outer peripheral face of the hollow cylindrical test body 3 and the inner peripheral face of a central small hole 5 by a pressurizing means 6 while load restraining deformation for the axial direction of the hollow cylindrical test body 3, and the radial deformation of the hollow cylindrical test body 3 is measured by a method in which pressure is not changed at the time when the outer pressure Pout and inner pressure Pin are changed respectively. Deformation property of the ground 1 is found from the relation of deformation and size of the outer pressure Pout and the inner pressure Pin.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、構造物の設計・施
工のために行う地盤調査において、地盤の変形特性を測
定するのに用いられるプレッシャーメータ試験法に関す
る。更に詳述すると、本発明は孔底に設けられた中空円
筒試験体を利用するプレッシャーメータ試験法の改良に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure meter test method used to measure the deformation characteristics of the ground in the ground survey for designing and constructing a structure. More specifically, the present invention relates to an improvement in a pressure meter test method using a hollow cylindrical test body provided at the bottom of a hole.

【0002】[0002]

【従来の技術】岩盤などの地盤の変形特性を把握するた
め、原位置試験が行われる。原位置試験は、実地に即し
たデータを得るため、原位置で掘削された地盤を試験体
として用い、当該原位置にて行われる。
2. Description of the Related Art In-situ tests are performed to understand the deformation characteristics of the ground such as rock. The in-situ test is performed at the in-situ position using the ground excavated at the in-situ position as a test body in order to obtain data suitable for the actual site.

【0003】この原位置試験の一つであるプレッシャー
メータ試験は、ボーリング孔内に加圧体を挿入すること
によって行うことができるものである。この場合、ボー
リング孔壁を加圧あるいは減圧し、該孔壁の変位を計測
して応力とひずみとの関係を求めている。この場合、孔
壁に載荷している圧力と孔壁の変位の関係について線形
弾性理論に基づく解析を行い、孔壁の地盤要素のせん断
応力とせん断ひずみとの関係を求めている。
A pressure meter test, which is one of the in-situ tests, can be performed by inserting a pressurized body into a borehole. In this case, the borehole wall is pressurized or depressurized, and the displacement of the hole wall is measured to determine the relationship between stress and strain. In this case, the relationship between the pressure applied to the hole wall and the displacement of the hole wall is analyzed based on the theory of linear elasticity, and the relationship between the shear stress and the shear strain of the ground element of the hole wall is obtained.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、ボーリ
ング孔壁を加圧・減圧するときの圧力と孔壁における変
位との関係については、ある特定の応力(初期の地盤応
力または地圧)下における変形特性しか調べることがで
きないという問題を有している。
However, the relationship between the pressure at the time of pressurizing and depressurizing the boring hole wall and the displacement at the hole wall is based on deformation under a specific stress (initial ground stress or ground pressure). There is a problem that only characteristics can be checked.

【0005】また、圧力をかける孔壁面で地盤の変位を
計測するために誤差(孔壁とゴム膜のなじみに起因する
ベッディング・エラーなど)が含まれた計測しかできな
い。
Further, in order to measure the displacement of the ground on the hole wall surface to which pressure is applied, only measurement including an error (bedding error caused by the penetration of the hole wall and the rubber film) can be performed.

【0006】そこで本発明は、任意の応力下における地
盤の変形特性を原位置で精度良く評価することができる
孔底の中空円筒試験体を利用したプレッシャーメータ試
験法を提供することを目的とする。
Accordingly, an object of the present invention is to provide a pressure meter test method using a hollow cylindrical test body with a hole bottom, which can accurately evaluate the deformation characteristics of the ground under an arbitrary stress in situ. .

【0007】[0007]

【課題を解決するための手段】かかる目的を達成するた
め、請求項1記載の発明のプレッシャーメータ試験法で
は、調査対象地盤にボーリング孔をあけ、そのボーリン
グ孔の孔底の地盤から中空円筒試験体を成形し、該中空
円筒試験体の軸方向への変形を拘束する荷重を拘束手段
により作用させながら、加圧手段により中空円筒試験体
の外周面と中央小孔の内周面とに径方向への外圧・内圧
をかけ、この外圧・内圧の大きさをそれぞれ独立に変化
させたときの中空円筒試験体の径方向の変位を圧力を変
化させない方で計測し、該変位と圧力との関係を用いて
地盤の変形特性を求めるようにしている。
In order to achieve the above object, in the pressure meter test method according to the first aspect of the present invention, a boring hole is made in the ground to be surveyed, and a hollow cylindrical test is performed from the ground at the bottom of the boring hole. While the body is formed and a load for restraining the deformation of the hollow cylindrical test body in the axial direction is applied by the restraining means, the diameter of the outer circumferential surface of the hollow cylindrical test body and the inner circumferential surface of the central small hole are increased by the pressing means. External pressure and internal pressure in the direction are applied, and the radial displacement of the hollow cylindrical test body when the magnitudes of the external pressure and the internal pressure are independently changed is measured without changing the pressure, and the difference between the displacement and the pressure is measured. The deformation characteristics of the ground are determined using the relationship.

【0008】プレッシャーメータ試験法によると、孔壁
に載荷している圧力pと孔壁の変位uc との関係が求め
られる。これを例えば線形弾性理論に基づく通常の解析
により、孔壁の地盤要素のせん断応力(p−p0) 〜せ
ん断ひずみ(孔壁ひずみとも呼ばれる:εc=uc
0)との関係に直す。ここで、p0は初期の地盤圧力、
0 は初期のボーリング孔半径である。このようにして
求められる応力〜ひずみ関係は、地盤内部の初期応力
(地圧)の拘束圧に対するもので、他の拘束圧に対する
関係は得られない(地盤の応力〜ひずみ関係は圧密応力
つまり拘束圧によって異なる)。しかし、請求項1記載
の発明によると、最初に内圧Pinと外圧Poutとを等し
くして試験体を圧密することができる。したがって、圧
密終了後に、内圧Pinまたは外圧Poutを独立に変化さ
せれば(Pin≠Pout)、任意の拘束圧下におけるプレ
ッシャーメータ試験が可能となる。そこで、孔底の中空
円筒試験体に対し、軸方向への動きを拘束しながら、平
面ひずみ条件下で、径方向の圧力を変化させた時の該方
向への変化の様子を計測し、試験体軸に直交する面内の
変形特性が求められる。この場合、中空円筒試験体はボ
ーリング孔の孔底の地盤を成形して設けられたものであ
り、この試験体に関して得られた特性がそのままその地
盤の性状として用いられ得る。
According to the pressure meter test method, the hole wall
Pressure p and hole wall displacement uc Seeking a relationship with
Can be This can be done, for example, by ordinary analysis based on linear elasticity theory.
The shear stress of the ground element on the hole wall (pp0)
Shearing strain (also called hole wall strain: εc= Uc/
r0). Where p0Is the initial ground pressure,
r 0 Is the initial borehole radius. Like this
The required stress-strain relationship is the initial stress inside the ground.
(Ground pressure) against the constrained pressure, against other constrained pressures
No relationship can be obtained (soil-strain relationship is consolidation stress
That is, it depends on the constraint pressure). However, claim 1
According to the invention, the internal pressure PinAnd external pressure PoutAnd equal
Thus, the specimen can be compacted. Therefore, the pressure
After the close, the internal pressure PinOr external pressure PoutChanged independently
If you do (Pin≠ Pout), Press under any constraint pressure
Sher meter test becomes possible. So, the hollow at the bottom of the hole
While restraining the axial movement of the cylindrical specimen,
When the radial pressure is changed under surface strain conditions
The direction of the change in the direction
Deformation characteristics are required. In this case, the hollow cylindrical specimen
It is provided by molding the ground at the bottom of the drilling hole.
Characteristics obtained for this specimen
It can be used as a property of a board.

【0009】請求項2記載の孔底の中空円筒試験体を利
用したプレッシャーメータ試験法では、ボーリング孔の
内周面と中空円筒試験体との間にスリットを設け、該ス
リットと中央小孔とに加圧手段を形成する加圧部材を設
けている。したがって中空円筒試験体に対し、外側と内
側とから、等方的な外圧及び内圧をかけることができ
る。またスリットに設けられた加圧部材は該スリットの
中でボーリング孔の内周面によって支持されるため、内
周面からの反作用を受け、中空円筒試験体に対しより有
効な外圧をかけることができる。
In the pressure meter test method using a hollow cylindrical test body having a hole bottom according to the present invention, a slit is provided between the inner peripheral surface of the boring hole and the hollow cylindrical test body, and the slit and the central small hole are provided. Is provided with a pressure member for forming a pressure means. Therefore, an isotropic external pressure and an internal pressure can be applied to the hollow cylindrical test body from the outside and the inside. In addition, since the pressing member provided in the slit is supported by the inner peripheral surface of the boring hole in the slit, it receives a reaction from the inner peripheral surface and can apply a more effective external pressure to the hollow cylindrical test body. it can.

【0010】[0010]

【発明の実施の形態】以下、本発明の構成を図面に示す
実施の形態の一例に基づいて詳細に説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an example of an embodiment shown in the drawings.

【0011】図1から図4に、本発明の孔底の中空円筒
試験体を利用したプレッシャーメータ試験法の一実施形
態を示す。この試験法では、原位置のボーリング孔2の
孔底に成形された地盤1から成る中空円筒試験体3に対
し、軸方向の変位を拘束しながら径方向へ加圧・減圧
し、そのときの変位を計測して変位と圧力の大きさとの
関係を得る。そこでまず、本発明の孔底の中空円筒試験
体を利用したプレッシャーメータ試験を行うための構成
について説明する。
FIGS. 1 to 4 show an embodiment of a pressure meter test method using a hollow cylindrical test body having a hole bottom according to the present invention. In this test method, a hollow cylindrical test body 3 composed of a ground 1 formed at the bottom of a boring hole 2 at an original position is pressurized and decompressed in a radial direction while restraining an axial displacement. The displacement is measured to obtain the relationship between the displacement and the magnitude of the pressure. Therefore, first, a configuration for performing a pressure meter test using a hollow cylindrical test body having a hole bottom according to the present invention will be described.

【0012】この孔底の中空円筒試験体を利用したプレ
ッシャーメータ試験を行うには、まず、図2に示すよう
に、原位置においてボーリングにより地盤1を鉛直下に
削孔し円柱状のボーリング孔2を設ける。ボーリング孔
2の孔底は、必要に応じて研磨する。そしてこのボーリ
ング孔2の内周面を孔底側に向けて鉛直方向へ延長する
ようにスリット状に溝掘りして円柱形状の試験体を成形
し、更にこの試験体の中央に鉛直方向へ中央小孔5を掘
削して図3に示すような中空円筒試験体3とする。この
場合、ボーリング孔2と中空円筒試験体3との間のスリ
ット4の溝幅や、中央小孔5の径は特に限定されること
はない。ただし本実施形態では、スリット4の幅や中央
小孔5の径は加圧部材7及び変位計測手段8を収容する
のに必要十分なものとされている。
In order to conduct a pressure meter test using the hollow cylindrical test body at the bottom of the hole, first, as shown in FIG. 2, the ground 1 is drilled vertically below by boring at the original position to form a cylindrical boring hole. 2 is provided. The bottom of the boring hole 2 is polished as necessary. A cylindrical test piece is formed by digging into a slit shape so that the inner peripheral surface of the boring hole 2 extends in the vertical direction toward the bottom of the hole, and a cylindrical test piece is formed at the center of the test piece. The small hole 5 is excavated to obtain a hollow cylindrical specimen 3 as shown in FIG. In this case, the groove width of the slit 4 between the boring hole 2 and the hollow cylindrical test body 3 and the diameter of the central small hole 5 are not particularly limited. However, in the present embodiment, the width of the slit 4 and the diameter of the central small hole 5 are required and sufficient to accommodate the pressing member 7 and the displacement measuring means 8.

【0013】次にスリット4と中央小孔5とに加圧手段
6を設ける。加圧手段6は中空円筒試験体3の外周面と
内周面とに外圧Pout 及び内圧Pinを加え径方向へ変位
させるものである。本実施形態では、この加圧手段6
は、袋状のゴム膜(ゴムスリーブ)・メンブレンなどか
ら成る加圧部材7と、この加圧部材たるメンブレン7の
中に圧力流体を供給する圧力源などから構成されてい
る。このメンブレン7は、スリット4及び中央小孔5に
それぞれ設けられている。このメンブレン7は、空気な
どの気体が注入可能な注入口を備え、気体圧力により中
空円筒試験体3に径方向への外圧Pout 及び内圧Pin
与えている。また、気体を加圧して送り込む加圧装置
(図示省略)がそれぞれのメンブレン7に個別に設けら
れ、スリット4のメンブレン7と中央小孔5のメンブレ
ン7とで圧力を独立変化させることができるようにされ
ている。尚、圧縮気体により外圧Pout 及び内圧Pin
加える代わりに、水などの液体を用いても外圧Pout
び内圧Pinを加えることができる。
Next, a pressure means 6 is provided in the slit 4 and the central small hole 5. Pressurizing means 6 are those in the outer peripheral surface of the hollow cylindrical test body 3 and the inner peripheral surface is displaced to the external pressure P out and the internal pressure P in the added radial. In the present embodiment, the pressing means 6
Is composed of a pressure member 7 made of a bag-like rubber film (rubber sleeve) / membrane and a pressure source for supplying a pressure fluid into the membrane 7 as the pressure member. The membrane 7 is provided in each of the slit 4 and the central small hole 5. The membrane 7 is provided with a gas injection infusion port such as air, it has given external pressure P out and the internal pressure P in the hollow cylindrical test body 3 in the radial direction by the gas pressure. Further, a pressurizing device (not shown) for pressurizing and sending the gas is separately provided for each of the membranes 7 so that the pressure can be independently changed by the membrane 7 of the slit 4 and the membrane 7 of the central small hole 5. Has been. Instead of adding the external pressure P out and the internal pressure P in the compressed gas, even with a liquid such as water can be added to external pressure P out and the internal pressure P in.

【0014】更に、中空円筒試験体3に軸方向への荷重
をかける拘束手段9がこの中空円筒試験体3の上方に設
けられ、荷重を作用させることにより外圧Pout または
内圧Pinを変化させる時の中空円筒試験体3の軸方向へ
の変形を拘束している。この拘束手段9は特定のものに
限定されることはないが、例えば本実施形態では中空円
筒試験体3に軸方向の荷重をかけるセンターホールジャ
ッキが用いられている。このセンターホールジャッキ
は、中空円筒試験体3の上部に併せて設けられるキャッ
プ11を介して中空円筒試験体3に荷重を付与してい
る。また拘束手段9は、中空円筒試験体3へ荷重をかけ
る際の反力を受け得るように地盤1に固定して設けられ
る。本実施形態では図4に示すようにボーリング孔2の
内周面の一部にケーシング10を取り付け、このケーシ
ング10を用いてセーターホールジャッキなどの拘束手
段9を固定させるようにしている。
Furthermore, restraining means 9 in a hollow cylindrical specimens 3 applying a load in the axial direction is provided above the hollow cylindrical test specimen 3, changes the external pressure P out or the internal pressure P in by the action of the load The deformation of the hollow cylindrical test body 3 in the axial direction at the time is restrained. The restraining means 9 is not limited to a specific one. For example, in the present embodiment, a center hole jack for applying a load in the axial direction to the hollow cylindrical test body 3 is used. This center hole jack applies a load to the hollow cylindrical test body 3 via a cap 11 provided along with the upper part of the hollow cylindrical test body 3. The restraining means 9 is fixed to the ground 1 so as to receive a reaction force when a load is applied to the hollow cylindrical test body 3. In this embodiment, as shown in FIG. 4, a casing 10 is attached to a part of the inner peripheral surface of the boring hole 2, and the casing 10 is used to fix the restraining means 9 such as a sweater hole jack.

【0015】上述のように設けられた各装置を用い原位
置においてプレッシャーメータ試験を行う。まず、中空
円筒試験体3に対して拘束手段9によって荷重を作用さ
せるのと同時に、加圧手段6を用いてメンブレン7へ気
体を送り込み中空円筒試験体3に等方的な外圧Pout
び内圧Pinを与える。この時、中空円筒試験体3は軸方
向に変形しても構わない。この後、中空円筒試験体3の
軸方向の変形を拘束した状態で、この外圧Pout または
内圧Pinの一方の大きさを変化させ、その圧力の大きさ
に対する中空円筒試験体3の側面における変位を変位計
測手段8により計測する。そして、圧力と変位との相関
関係をグラフなどに表し、地盤の変形特性を求める。こ
こで、変位計測手段8としては、特定の計測システムに
限定されることはなく、例えば作動トランス型やひずみ
ゲージ型あるいはポテンショメータ型などの変位計を用
いて直接変位を測定しても良いし、レーザ型や渦電流型
などの非接触型変位計を用いて間接的に変位を計測する
ようにしても良い。
A pressure meter test is performed at the original position using each device provided as described above. First, at the same time that a load is applied to the hollow cylindrical test body 3 by the restraining means 9, gas is sent to the membrane 7 using the pressurizing means 6, and the external pressure P out and the internal pressure areotropically applied to the hollow cylindrical test body 3. give the P in. At this time, the hollow cylindrical test body 3 may be deformed in the axial direction. Thereafter, while restraining the axial deformation of the hollow cylindrical test body 3, in the external pressure P out or alter one of the magnitude of the internal pressure P in, the side surface of the hollow cylindrical specimens 3 to the size of the pressure The displacement is measured by the displacement measuring means 8. Then, the correlation between the pressure and the displacement is represented in a graph or the like, and the deformation characteristics of the ground are obtained. Here, the displacement measuring means 8 is not limited to a specific measuring system, and may directly measure displacement using a displacement meter such as an operation transformer type, a strain gauge type, or a potentiometer type, The displacement may be measured indirectly using a non-contact displacement meter such as a laser type or an eddy current type.

【0016】以上のようにして試験を行う孔底の中空円
筒試験体を利用したプレッシャーメータ試験法による
と、軸方向への変形を拘束しながら外圧Pout または内
圧Pinの一方を変化させた時の中空円筒試験体の径方向
の変位を、圧力を変化させていない側で計測するので、
ベッディング・エラーの影響を受けずに、原位置で高精
度な変位計測をすることができる。しかも複数の深度で
試験を実施すれば、地盤の変形特性の深度分布を原位置
にて高精度に評価することができる。
[0016] According to the above manner Pressuremeter test method using the hollow cylindrical specimens of bottom hole to be tested, varying the one of the external pressure P out or the internal pressure P in while restraining the deformation in the axial direction Since the radial displacement of the hollow cylindrical specimen at the time is measured on the side where the pressure is not changed,
High-precision displacement measurement can be performed at the original position without being affected by bedding errors. Moreover, if the test is performed at a plurality of depths, the depth distribution of the deformation characteristics of the ground can be evaluated with high accuracy at the original position.

【0017】尚、上述の実施形態は本発明の好適な実施
の一例ではあるがこれに限定されるものではなく本発明
の要旨を逸脱しない範囲において種々変形実施可能であ
る。
The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

【0018】[0018]

【発明の効果】以上の説明より明らかなように、請求項
1記載の発明の孔底の中空円筒試験体を利用したプレッ
シャーメータ試験法では、ボーリング孔の孔底に成形し
て設けられた中空円筒試験体を、軸方向への変形を拘束
しながら、加圧手段により外圧・内圧を独立に作用させ
て径方向へ変位させ、圧力を変化させていない側で変位
を測定するようにしているので、あらゆる応力下におけ
る圧力と変位との関係がベッディング・エラーなどを含
まずに精密に求められる。したがって、この試験法で
は、中空円筒試験体はボーリング孔の孔底の地盤を成形
することにより設けられたものであり、この試験体に関
して得られた特性がそのままその地盤の性状として用い
られ得る。
As is apparent from the above description, in the pressure meter test method using the hollow cylindrical test body having the hole bottom according to the first aspect of the present invention, the hollow formed by forming at the bottom of the bore hole is provided. The cylindrical test specimen is displaced in the radial direction by applying the external pressure and internal pressure independently by the pressurizing means while restraining the deformation in the axial direction, and the displacement is measured on the side where the pressure is not changed. Therefore, the relationship between the pressure and the displacement under any stress can be precisely obtained without including a bedding error or the like. Therefore, in this test method, the hollow cylindrical test body is provided by molding the ground at the bottom of the borehole, and the properties obtained with respect to this test body can be used as it is as the properties of the ground.

【0019】また、請求項2記載の発明の孔底の中空円
筒試験体を利用したプレッシャーメータ試験法では、ボ
ーリング孔内周面と中空円筒試験体との間にスリットを
設け、該スリットに加圧手段を形成する加圧部材を設け
るようにしているので、加圧部材をボーリング孔内周面
で受け支えることができる。したがって、加圧部材を受
け支える部材を特に設けていなくても、加圧手段を用い
て中空円筒試験体に圧力を作用させることができる。
Further, in the pressure meter test method using the hollow cylindrical test body having a hole bottom according to the second aspect of the present invention, a slit is provided between the inner peripheral surface of the boring hole and the hollow cylindrical test body, and the slit is added to the slit. Since the pressure member forming the pressure means is provided, the pressure member can be supported on the inner peripheral surface of the boring hole. Therefore, the pressure can be applied to the hollow cylindrical test body by using the pressurizing means without providing a member for supporting the pressurizing member.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の孔底の中空円筒試験体を利用したプレ
ッシャーメータ試験法で利用されるボーリング孔及び孔
底に設けられる中空円筒試験体を示す原位置地盤の縦断
面図である。
FIG. 1 is a longitudinal sectional view of an in-situ ground showing a boring hole used in a pressure meter test method using a hollow cylindrical specimen having a hole bottom according to the present invention and a hollow cylindrical specimen provided at the hole bottom.

【図2】原位置地盤に掘削されたボーリング孔を示す縦
断面である。
FIG. 2 is a longitudinal sectional view showing a boring hole excavated in an in-situ ground.

【図3】ボーリング孔とその孔底に成形された中空円筒
試験体とを示す縦断面図である。
FIG. 3 is a longitudinal sectional view showing a borehole and a hollow cylindrical test body formed at the bottom of the borehole.

【図4】中空円筒試験体への荷重の反力をボーリング孔
の壁面で受ける様子を示す縦断面図である。
FIG. 4 is a longitudinal sectional view showing a state in which a reaction force of a load to a hollow cylindrical test body is received on a wall surface of a boring hole.

【符号の説明】[Explanation of symbols]

1 地盤 2 ボーリング孔 3 中空円筒試験体 4 スリット 5 中央小孔 6 加圧手段 7 加圧手段を構成するメンブレン(加圧部材) 9 拘束手段 DESCRIPTION OF SYMBOLS 1 Ground 2 Boring hole 3 Hollow cylindrical test body 4 Slit 5 Center small hole 6 Pressurizing means 7 Membrane (pressurizing member) constituting pressurizing means 9 Restraining means

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 調査対象地盤にボーリング孔をあけ、そ
のボーリング孔の孔底の地盤から中空円筒試験体を成形
し、該中空円筒試験体の軸方向への変形を拘束する荷重
を拘束手段により作用させながら、加圧手段により前記
中空円筒試験体の外周面と中央小孔の内周面とに径方向
への外圧・内圧をかけ、この外圧・内圧の大きさをそれ
ぞれ独立に変化させたときの前記中空円筒試験体の径方
向の変位を圧力を変化させない方で計測し、該変位と前
記圧力との関係を用いて地盤の変形特性を求めることを
特徴とする孔底の中空円筒試験体を利用したプレッシャ
ーメータ試験法。
1. A boring hole is drilled in the ground to be surveyed, a hollow cylindrical test body is formed from the ground at the bottom of the boring hole, and a load for restraining deformation of the hollow cylindrical test body in an axial direction is restrained by restraining means. While acting, external pressure and internal pressure were applied in the radial direction to the outer peripheral surface of the hollow cylindrical test body and the inner peripheral surface of the central small hole by the pressurizing means, and the magnitudes of the external pressure and the internal pressure were independently changed. The hollow cylinder test at the bottom of the hole characterized by measuring the radial displacement of the hollow cylindrical test body at the time without changing the pressure and obtaining the deformation characteristics of the ground using the relationship between the displacement and the pressure. Pressure meter test method using body.
【請求項2】 前記ボーリング孔の内周面と中空円筒試
験体との間にスリットを設け、該スリットと前記中央小
孔とに前記加圧手段を形成する加圧部材を設けることを
特徴とする請求項1記載の孔底の中空円筒試験体を利用
したプレッシャーメータ試験法。
2. A slit is provided between the inner peripheral surface of the boring hole and the hollow cylindrical test body, and a pressing member forming the pressing means is provided between the slit and the central small hole. A pressure meter test method using a hollow cylindrical test body having a hole bottom according to claim 1.
JP9318696A 1997-11-19 1997-11-19 Pressure meter test method utilizing hollow cylindrical test body with hole bottom Pending JPH11152984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9318696A JPH11152984A (en) 1997-11-19 1997-11-19 Pressure meter test method utilizing hollow cylindrical test body with hole bottom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9318696A JPH11152984A (en) 1997-11-19 1997-11-19 Pressure meter test method utilizing hollow cylindrical test body with hole bottom

Publications (1)

Publication Number Publication Date
JPH11152984A true JPH11152984A (en) 1999-06-08

Family

ID=18101995

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9318696A Pending JPH11152984A (en) 1997-11-19 1997-11-19 Pressure meter test method utilizing hollow cylindrical test body with hole bottom

Country Status (1)

Country Link
JP (1) JPH11152984A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102312421A (en) * 2011-07-15 2012-01-11 宁夏回族自治区电力设计院 Field immersion load test device for determining collapsibility coefficient of collapsible loess and test method thereof
JP2015021767A (en) * 2013-07-17 2015-02-02 国立大学法人横浜国立大学 Method and apparatus for in-situ bedrock testing
CN114526996A (en) * 2022-04-24 2022-05-24 南通金凯莎寝饰用品有限公司 Textile fabric deformation and tearing detection device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102312421A (en) * 2011-07-15 2012-01-11 宁夏回族自治区电力设计院 Field immersion load test device for determining collapsibility coefficient of collapsible loess and test method thereof
JP2015021767A (en) * 2013-07-17 2015-02-02 国立大学法人横浜国立大学 Method and apparatus for in-situ bedrock testing
CN114526996A (en) * 2022-04-24 2022-05-24 南通金凯莎寝饰用品有限公司 Textile fabric deformation and tearing detection device
CN114526996B (en) * 2022-04-24 2022-07-01 南通金凯莎寝饰用品有限公司 Textile fabric deformation and tearing detection device

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